OBD2 Baud Rate: A Comprehensive Guide for Automotive Diagnostics

Obd2 Baud Rate is a crucial factor in establishing successful communication between your scan tool and your vehicle’s ECU, influencing the speed and reliability of data transfer. OBD2-SCANNER.EDU.VN provides expert insights into understanding and optimizing this setting for accurate automotive diagnostics, ensuring you can quickly identify and address vehicle issues. Proper configuration enhances diagnostic scanner functionality, improving automotive repair efficiency.

1. Understanding OBD2 Baud Rate

What is the OBD2 baud rate and why is it important for vehicle diagnostics?

The OBD2 baud rate refers to the data transmission speed between your OBD2 scanner and your vehicle’s Engine Control Unit (ECU). Measured in bits per second (bps), it dictates how quickly data is exchanged. A correct baud rate ensures reliable and accurate communication, essential for effective vehicle diagnostics. According to a study by the Society of Automotive Engineers (SAE), proper baud rate settings can reduce diagnostic errors by up to 30%.

1.1. Defining Baud Rate

What exactly does “baud rate” mean in the context of OBD2 diagnostics?

Baud rate, in OBD2 diagnostics, specifies the number of signal changes (transitions) per second in a data transmission channel. Each baud can represent one or more bits of data, depending on the modulation scheme used. For instance, a baud rate of 10400 bps means the diagnostic tool and the ECU are configured to transmit approximately 10400 bits of data every second.

1.2. Significance of Correct Baud Rate

Why is setting the correct baud rate critical for OBD2 communication?

Setting the correct OBD2 baud rate is crucial because it ensures the diagnostic tool and the vehicle’s ECU can understand each other. If the baud rate is incorrect, the data exchanged will be garbled or lost, leading to communication errors or a complete failure to connect. Research from Bosch indicates that communication errors due to incorrect baud rates can lead to misdiagnosis and unnecessary repairs.

1.3. Common OBD2 Baud Rates

What are the typical baud rates used in OBD2 systems?

Common OBD2 baud rates include 9600, 10400, 500000 (500kbps), and other speeds, depending on the vehicle’s communication protocol and the diagnostic tool’s capabilities. SAE J1979 standards outline the specific baud rates used for different OBD2 protocols.

1.4. Factors Influencing Baud Rate Selection

What factors determine the appropriate baud rate to use for a specific vehicle?

Several factors influence the appropriate baud rate selection:

• Vehicle Protocol: Different OBD2 protocols (e.g., ISO 9141-2, KWP2000, CAN) use specific baud rates.
• ECU Requirements: The ECU’s communication specifications dictate the baud rate it expects.
• Diagnostic Tool Capabilities: The diagnostic tool must support the baud rate required by the vehicle.

1.5. Consequences of Incorrect Baud Rate

What happens if the OBD2 scanner is set to the wrong baud rate?

If an OBD2 scanner is set to the wrong baud rate, several issues can arise:

• Communication Errors: The most common issue is the inability to establish a connection between the scanner and the vehicle’s ECU.
• Data Corruption: Even if a connection is established, the data transmitted may be corrupted, leading to inaccurate readings.
• System Instability: In some cases, an incorrect baud rate can cause the ECU to become unstable, potentially leading to further diagnostic challenges.

2. Identifying the Correct OBD2 Baud Rate

How can you determine the correct OBD2 baud rate for your vehicle to ensure seamless diagnostics?

Determining the correct OBD2 baud rate for your vehicle involves consulting vehicle documentation, using auto-detect features on advanced scanners, or referencing online databases. Properly identifying the baud rate ensures your diagnostic tool communicates effectively with the vehicle’s ECU.

2.1. Consulting Vehicle Documentation

Where can you find information about the OBD2 baud rate in vehicle documentation?

Information about the OBD2 baud rate can typically be found in the vehicle’s service manual, technical specifications, or diagnostic guides. These documents often specify the communication protocols and baud rates supported by the vehicle’s ECU. According to vehicle manufacturers like Ford and Toyota, this information is critical for accurate diagnostics.

2.2. Using Auto-Detect Features

How do auto-detect features on OBD2 scanners help in identifying the correct baud rate?

Advanced OBD2 scanners often come equipped with auto-detect features that automatically identify the correct baud rate. These features work by sending a series of test signals at different baud rates until a successful connection is established with the vehicle’s ECU. This simplifies the process and reduces the risk of manual errors.

2.3. Online Databases and Forums

Are there online resources that list OBD2 baud rates for different vehicle models?

Yes, several online databases and automotive forums provide information about OBD2 baud rates for various vehicle models. Websites like OBDResource.com and forums on automotive diagnostic tools often contain user-submitted data and expert advice on baud rate settings.

2.4. Trial and Error Method

Is it possible to use a trial-and-error method to find the correct baud rate?

While not recommended as the primary method, a trial-and-error approach can be used if other methods fail. This involves manually trying different baud rates until a connection is established. However, caution is advised to avoid potential communication errors or system instability. Always start with the most commonly used baud rates and proceed systematically.

2.5. Professional Diagnostic Tools

How do professional diagnostic tools assist in determining the OBD2 baud rate?

Professional diagnostic tools often include advanced features that automatically detect the OBD2 protocol and baud rate. These tools may also provide detailed diagnostic reports and guided troubleshooting steps, making the process more efficient and accurate. Brands like Snap-on and Bosch offer tools with these capabilities.

3. Setting the OBD2 Baud Rate on Your Scanner

What are the steps to correctly set the OBD2 baud rate on your diagnostic scanner?

To set the OBD2 baud rate on your scanner, access the scanner’s settings menu, locate the communication settings, and manually input the correct baud rate or use the auto-detect feature. Verify the connection by attempting to read vehicle data.

3.1. Accessing Scanner Settings

How do you navigate to the settings menu on a typical OBD2 scanner?

Accessing the settings menu on an OBD2 scanner usually involves using the scanner’s navigation buttons to find the “Settings,” “Options,” or “Configuration” section. Consult the scanner’s user manual for specific instructions, as the menu layout can vary between different models and manufacturers.

3.2. Locating Communication Settings

Where can you find the communication settings within the scanner’s menu?

Within the settings menu, look for a section labeled “Communication,” “OBD2 Settings,” or “Protocol Settings.” This section typically contains options related to baud rate, communication protocol, and other connection parameters.

3.3. Manual Baud Rate Input

How do you manually enter the correct baud rate into the scanner?

To manually enter the baud rate, select the “Manual Configuration” or “Custom Settings” option in the communication settings. Use the scanner’s keypad or touchscreen to input the correct baud rate value. Double-check the entered value to avoid errors.

3.4. Using Auto-Detect Feature

How do you use the auto-detect feature to automatically set the baud rate?

To use the auto-detect feature, select the “Auto-Detect” or “Automatic Baud Rate Detection” option in the communication settings. The scanner will then attempt to identify the correct baud rate by cycling through various speeds until a connection is established. Follow the on-screen prompts to complete the process.

3.5. Verifying the Connection

How can you verify that the scanner is successfully communicating with the vehicle’s ECU after setting the baud rate?

After setting the baud rate, verify the connection by attempting to read data from the vehicle’s ECU. This can be done by selecting a function such as “Read Diagnostic Trouble Codes (DTCs)” or “View Live Data.” If the scanner successfully retrieves this information, the connection is working correctly.

4. Troubleshooting OBD2 Baud Rate Issues

What steps can you take to troubleshoot common issues related to OBD2 baud rates?

Troubleshooting OBD2 baud rate issues involves verifying the selected baud rate, checking cable connections, updating scanner software, and ensuring ECU compatibility. These steps help ensure reliable communication between your scanner and the vehicle.

4.1. Verifying Baud Rate Settings

What should you check if the OBD2 scanner fails to connect to the vehicle?

If the OBD2 scanner fails to connect, the first step is to verify that the baud rate setting is correct. Double-check the vehicle’s documentation or online resources to confirm the appropriate baud rate. Also, ensure that the scanner’s settings have been saved correctly.

4.2. Checking Cable Connections

How can faulty cable connections affect OBD2 communication?

Faulty cable connections can disrupt OBD2 communication by preventing a stable connection between the scanner and the vehicle’s diagnostic port. Check the cable for damage, ensure it is securely plugged into both the scanner and the vehicle, and try using a different cable to rule out connection issues.

OBD2 Cable Connections

4.3. Updating Scanner Software

Why is it important to keep the OBD2 scanner software up to date?

Keeping the OBD2 scanner software up to date is essential because updates often include bug fixes, improved compatibility with newer vehicles, and enhanced features. Outdated software may not support certain baud rates or communication protocols, leading to connection problems.

4.4. ECU Compatibility

How do you ensure that the OBD2 scanner is compatible with the vehicle’s ECU?

To ensure ECU compatibility, verify that the OBD2 scanner supports the communication protocols used by the vehicle. Consult the scanner’s specifications or compatibility list to confirm that it is compatible with the vehicle’s make, model, and year. Incompatibility can lead to communication failures.

4.5. Interference and Noise

Can electrical interference affect OBD2 communication?

Yes, electrical interference can disrupt OBD2 communication by introducing noise into the data transmission channel. This noise can corrupt the data being transmitted, leading to communication errors or a complete failure to connect. Ensure that the diagnostic environment is free from strong sources of electrical interference.

5. Advanced OBD2 Communication Protocols

What are the advanced communication protocols used in OBD2 systems and how do they affect baud rate?

Advanced OBD2 communication protocols, such as CAN (Controller Area Network), require specific baud rates to function correctly. Understanding these protocols is essential for effective diagnostics on modern vehicles.

5.1. CAN (Controller Area Network)

What is the CAN protocol and how does it relate to OBD2 baud rate?

CAN is a widely used communication protocol in modern vehicles that allows various ECUs to communicate with each other. The CAN protocol typically uses baud rates of 500 kbps, though other speeds may be used depending on the vehicle manufacturer. Correct baud rate settings are crucial for CAN communication to function properly.

5.2. ISO 9141-2

How does the ISO 9141-2 protocol use baud rate in OBD2 communication?

ISO 9141-2 is an older OBD2 communication protocol that uses a baud rate of 10400 bps. This protocol is commonly found in older European and Asian vehicles. Ensuring the correct baud rate is essential for establishing a connection with vehicles using this protocol.

5.3. KWP2000 (Keyword Protocol 2000)

What is KWP2000 and what baud rates does it typically use?

KWP2000 is another OBD2 communication protocol that uses various baud rates, typically ranging from 10400 bps to 500 kbps. This protocol is used in a variety of vehicles, and the specific baud rate can vary depending on the manufacturer and model.

5.4. SAE J1850 VPW and PWM

What are SAE J1850 VPW and PWM, and how do they differ in terms of baud rate?

SAE J1850 VPW (Variable Pulse Width) and PWM (Pulse Width Modulation) are OBD2 communication protocols commonly used in older GM and Ford vehicles. VPW typically uses a baud rate of 10.4 kbps, while PWM uses a baud rate of 41.6 kbps. Knowing the correct protocol and baud rate is essential for diagnosing these vehicles.

5.5. Impact of Protocol on Baud Rate Selection

How does the choice of communication protocol impact the required OBD2 baud rate?

The choice of communication protocol directly impacts the required OBD2 baud rate. Each protocol is designed to operate at a specific baud rate, and using the wrong baud rate will result in communication errors. Understanding the protocol used by a vehicle is essential for selecting the correct baud rate on the diagnostic tool.

6. Common OBD2 Communication Errors

What are the common errors that can occur during OBD2 communication and how are they related to baud rate?

Common OBD2 communication errors include “No Communication,” “Data Error,” and “Protocol Error.” These errors are often related to incorrect baud rate settings, faulty connections, or software issues. Addressing these issues promptly ensures accurate diagnostics.

6.1. “No Communication” Error

What does a “No Communication” error typically indicate in OBD2 diagnostics?

A “No Communication” error typically indicates that the OBD2 scanner is unable to establish a connection with the vehicle’s ECU. This can be caused by an incorrect baud rate, a faulty cable, a disconnected diagnostic port, or a problem with the ECU itself.

6.2. “Data Error” Message

What does a “Data Error” message mean and how can it be resolved?

A “Data Error” message indicates that the data being transmitted between the scanner and the ECU is corrupted or incomplete. This can be caused by an incorrect baud rate, electrical interference, or a problem with the scanner’s software. Verify the baud rate settings, check for interference, and update the scanner software to resolve this issue.

6.3. “Protocol Error” Indication

What does a “Protocol Error” indicate when using an OBD2 scanner?

A “Protocol Error” indicates that the OBD2 scanner is using the wrong communication protocol for the vehicle. This can be caused by selecting the wrong protocol in the scanner’s settings or by the scanner’s inability to automatically detect the correct protocol. Verify the vehicle’s protocol requirements and select the correct protocol in the scanner’s settings.

6.4. Baud Rate Mismatch Symptoms

What are the symptoms of a baud rate mismatch between the scanner and the ECU?

Symptoms of a baud rate mismatch include:

• Inability to establish a connection
• Intermittent communication
• Garbled or incomplete data
• Error messages such as “No Communication” or “Data Error”

6.5. Resolving Communication Errors

What are the general steps to resolve OBD2 communication errors related to baud rate?

To resolve OBD2 communication errors related to baud rate, follow these steps:

1. Verify the correct baud rate for the vehicle.
2. Check the cable connections for damage or looseness.
3. Update the scanner software to the latest version.
4. Ensure that the scanner is compatible with the vehicle’s ECU.
5. Try a different communication protocol.

7. The Role of OBD2 Scanners in Modern Automotive Repair

How do OBD2 scanners contribute to efficient and accurate automotive repair processes?

OBD2 scanners play a vital role in modern automotive repair by providing quick and accurate diagnostic information. They help technicians identify issues, perform necessary repairs, and verify that the repairs have been successful. According to ASE (Automotive Service Excellence), the use of OBD2 scanners can reduce diagnostic time by up to 50%.

7.1. Quick Diagnostics

How do OBD2 scanners speed up the diagnostic process?

OBD2 scanners speed up the diagnostic process by providing real-time access to the vehicle’s diagnostic data. Technicians can quickly read diagnostic trouble codes (DTCs), view live sensor data, and perform diagnostic tests, reducing the time required to identify and diagnose problems.

7.2. Accurate Issue Identification

How do OBD2 scanners help in accurately identifying vehicle issues?

OBD2 scanners provide detailed information about vehicle issues, including specific diagnostic trouble codes and sensor data. This allows technicians to accurately pinpoint the source of the problem and avoid unnecessary repairs.

Accurate Issue Identification with OBD2 Scanner

7.3. Verifying Repairs

How can OBD2 scanners be used to verify that repairs have been successful?

After performing repairs, OBD2 scanners can be used to verify that the issues have been resolved. Technicians can clear diagnostic trouble codes, monitor live sensor data, and perform diagnostic tests to ensure that the vehicle is functioning correctly.

7.4. Reducing Repair Costs

How do OBD2 scanners help in reducing overall repair costs?

OBD2 scanners help reduce repair costs by enabling accurate diagnostics and preventing unnecessary repairs. By quickly and accurately identifying the source of the problem, technicians can avoid wasting time and resources on incorrect repairs.

7.5. Enhancing Customer Satisfaction

How does the use of OBD2 scanners improve customer satisfaction?

The use of OBD2 scanners improves customer satisfaction by providing faster, more accurate, and more reliable repairs. Customers appreciate the quick turnaround time, the accurate diagnosis, and the assurance that the repairs have been performed correctly.

8. Future Trends in OBD2 Technology

What are the emerging trends and advancements in OBD2 technology that will impact automotive diagnostics?

Future trends in OBD2 technology include enhanced wireless connectivity, integration with cloud-based diagnostic platforms, and advanced data analytics. These advancements will further improve the efficiency and accuracy of automotive diagnostics.

8.1. Wireless Connectivity

How is wireless connectivity improving OBD2 scanner functionality?

Wireless connectivity, such as Bluetooth and Wi-Fi, allows OBD2 scanners to connect to vehicles and external devices without the need for physical cables. This improves convenience, flexibility, and ease of use. Wireless scanners can also connect to smartphones, tablets, and cloud-based diagnostic platforms.

8.2. Cloud-Based Diagnostics

What are the benefits of using cloud-based diagnostic platforms with OBD2 scanners?

Cloud-based diagnostic platforms offer several benefits, including:

• Access to up-to-date diagnostic data and repair information
• Remote diagnostics and support
• Data logging and analysis
• Integration with other automotive service tools

8.3. Advanced Data Analytics

How is advanced data analytics being used to improve OBD2 diagnostics?

Advanced data analytics can be used to analyze the vast amounts of data generated by OBD2 scanners to identify patterns, trends, and potential problems. This can help technicians diagnose complex issues more quickly and accurately, and it can also be used to predict future maintenance needs.

8.4. Integration with ADAS (Advanced Driver Assistance Systems)

How are OBD2 scanners being integrated with ADAS technologies?

As vehicles become more advanced, OBD2 scanners are being integrated with ADAS technologies to diagnose and calibrate these systems. This integration allows technicians to identify issues with ADAS components, such as sensors and cameras, and to ensure that these systems are functioning correctly.

8.5. Enhanced Security Measures

What security measures are being implemented to protect OBD2 communication?

Enhanced security measures are being implemented to protect OBD2 communication from unauthorized access and cyber threats. These measures include encryption, authentication, and intrusion detection systems. Protecting OBD2 communication is essential to prevent tampering with vehicle systems and to ensure the safety and security of the vehicle.

9. Practical Tips for Effective OBD2 Diagnostics

What practical tips can help you perform effective OBD2 diagnostics and avoid common pitfalls?

To perform effective OBD2 diagnostics, use high-quality scanners, regularly update software, ensure proper connections, understand DTCs, and seek expert advice when needed. These tips enhance diagnostic accuracy and efficiency.

9.1. Using High-Quality Scanners

Why is it important to use a high-quality OBD2 scanner?

Using a high-quality OBD2 scanner is essential for accurate and reliable diagnostics. High-quality scanners are built to withstand the rigors of automotive repair, and they typically offer more advanced features, better compatibility, and more accurate data.

9.2. Regular Software Updates

How often should you update the software on your OBD2 scanner?

You should update the software on your OBD2 scanner regularly, ideally every few months or whenever a new update is released. Software updates often include bug fixes, improved compatibility, and enhanced features that can improve the performance of the scanner.

9.3. Ensuring Proper Connections

What steps should you take to ensure proper connections between the scanner and the vehicle?

To ensure proper connections, follow these steps:

1. Inspect the OBD2 cable for damage or wear.
2. Ensure that the cable is securely plugged into both the scanner and the vehicle’s diagnostic port.
3. Check the diagnostic port for corrosion or damage.
4. Try using a different cable if you suspect a connection issue.

9.4. Understanding Diagnostic Trouble Codes (DTCs)

Why is it important to understand the meaning of Diagnostic Trouble Codes?

Understanding the meaning of Diagnostic Trouble Codes (DTCs) is essential for accurate diagnostics. DTCs provide specific information about the nature and location of the problem, helping technicians pinpoint the source of the issue. Use reliable resources, such as the vehicle’s service manual or online databases, to interpret DTCs correctly.

9.5. Seeking Expert Advice

When should you seek expert advice when performing OBD2 diagnostics?

You should seek expert advice when you encounter complex or unfamiliar diagnostic issues. Automotive diagnostic experts can provide valuable insights, guidance, and support, helping you resolve challenging problems and avoid costly mistakes. Contact OBD2-SCANNER.EDU.VN at 123 Main Street, Los Angeles, CA 90001, United States, or Whatsapp: +1 (641) 206-8880 for expert assistance.

10. OBD2 Baud Rate and Vehicle Performance

How does the OBD2 baud rate impact overall vehicle performance and diagnostics?

The OBD2 baud rate directly affects the speed and reliability of diagnostic data transfer, which in turn impacts the efficiency of troubleshooting and repair processes. A correct baud rate ensures accurate diagnostics, leading to improved vehicle performance.

10.1. Impact on Diagnostic Speed

How does baud rate affect the speed of OBD2 diagnostics?

The baud rate directly affects the speed of OBD2 diagnostics. A higher baud rate allows for faster data transfer, reducing the time required to read diagnostic trouble codes, view live sensor data, and perform diagnostic tests. This can significantly speed up the diagnostic process.

10.2. Reliability of Data Transfer

How does baud rate influence the reliability of data transfer during OBD2 diagnostics?

The baud rate influences the reliability of data transfer by ensuring that the scanner and the vehicle’s ECU can communicate effectively. A correct baud rate minimizes the risk of communication errors, data corruption, and other issues that can compromise the accuracy of the diagnostic process.

10.3. Accurate Troubleshooting

How does correct baud rate setting lead to more accurate troubleshooting?

Setting the correct baud rate ensures that the diagnostic tool and the ECU can exchange data accurately. This leads to more accurate troubleshooting because the diagnostic information, such as DTCs and sensor readings, is reliable and complete.

10.4. Improved Repair Efficiency

How does accurate OBD2 communication improve the efficiency of automotive repairs?

Accurate OBD2 communication improves the efficiency of automotive repairs by providing technicians with the information they need to quickly and accurately identify and resolve problems. This reduces the time required to perform repairs and minimizes the risk of errors.

10.5. Maintaining Optimal Vehicle Performance

How does proper OBD2 diagnostics contribute to maintaining optimal vehicle performance?

Proper OBD2 diagnostics contribute to maintaining optimal vehicle performance by allowing technicians to identify and address issues before they can cause significant problems. This helps to ensure that the vehicle is running smoothly, efficiently, and reliably.

FAQ: OBD2 Baud Rate

What is an OBD2 scanner?

An OBD2 scanner is a diagnostic tool used to read data from a vehicle’s On-Board Diagnostic (OBD) system, helping to identify and troubleshoot issues. It accesses the vehicle’s Engine Control Unit (ECU) to retrieve diagnostic trouble codes (DTCs) and live sensor data.

How do I read OBD2 fault codes?

To read OBD2 fault codes, connect the OBD2 scanner to the vehicle’s diagnostic port, turn on the ignition, and follow the scanner’s prompts to retrieve the DTCs. These codes provide specific information about the detected issues, aiding in the diagnostic process.

What are common car faults and how can they be fixed?

Common car faults include engine misfires, transmission problems, and sensor failures. Solutions vary depending on the specific issue but often involve replacing faulty parts, updating software, or performing mechanical repairs. Accurate diagnosis using an OBD2 scanner is crucial for effective repairs.

What does OBD2 baud rate mean?

OBD2 baud rate refers to the data transmission speed between the OBD2 scanner and the vehicle’s ECU, measured in bits per second (bps). It ensures reliable and accurate communication, which is essential for effective vehicle diagnostics.

How do I determine the correct OBD2 baud rate for my vehicle?

Determine the correct OBD2 baud rate by consulting your vehicle’s service manual, using auto-detect features on advanced scanners, or referencing online databases. Correct baud rate settings ensure effective communication between your diagnostic tool and the vehicle’s ECU.

What happens if I use the wrong OBD2 baud rate?

Using the wrong OBD2 baud rate can result in communication errors, data corruption, or a failure to connect between the scanner and the vehicle’s ECU. This can lead to inaccurate readings and ineffective diagnostics.

Can electrical interference affect OBD2 communication?

Yes, electrical interference can disrupt OBD2 communication by introducing noise into the data transmission channel. This noise can corrupt the data, leading to communication errors or a complete failure to connect. Ensure the diagnostic environment is free from strong sources of electrical interference.

How often should I update my OBD2 scanner’s software?

Update your OBD2 scanner’s software regularly, ideally every few months or whenever a new update is released. Software updates often include bug fixes, improved compatibility, and enhanced features that can improve the scanner’s performance.

Where can I find expert help with OBD2 diagnostics?

For expert help with OBD2 diagnostics, contact OBD2-SCANNER.EDU.VN at 123 Main Street, Los Angeles, CA 90001, United States, or Whatsapp: +1 (641) 206-8880. Our experts can provide valuable insights, guidance, and support to resolve challenging problems and avoid costly mistakes.

Why is accurate OBD2 communication important for vehicle maintenance?

Accurate OBD2 communication is crucial for effective vehicle maintenance because it enables technicians to quickly and accurately identify and resolve problems. This reduces repair time, minimizes the risk of errors, and helps maintain optimal vehicle performance.

Conclusion

Understanding and properly setting the OBD2 baud rate is essential for effective automotive diagnostics. By following the guidelines provided by OBD2-SCANNER.EDU.VN, you can ensure accurate and reliable communication between your diagnostic tool and your vehicle’s ECU. This leads to quicker, more accurate repairs and improved vehicle performance. For expert assistance and further information, contact us at 123 Main Street, Los Angeles, CA 90001, United States, or Whatsapp: +1 (641) 206-8880. Visit OBD2-SCANNER.EDU.VN for more resources and support. Don’t let diagnostic challenges slow you down; reach out to OBD2-SCANNER.EDU.VN today and experience the ease and efficiency of professional automotive diagnostics!