How Do I Get OBD2 Monitor Ready For Emission Testing?

Getting your OBD2 monitor ready is crucial for passing emission tests, and this article from OBD2-SCANNER.EDU.VN provides a comprehensive guide. Ensuring readiness involves understanding monitor types, driving cycles, and troubleshooting incomplete statuses, helping you prepare your vehicle effectively. You will also learn about diagnostic trouble codes and emission control systems.

1. What Does It Mean to Get Obd2 Monitor Ready?

Getting your OBD2 monitor ready means ensuring that your vehicle’s onboard diagnostic system has completed all necessary self-tests for its emission control systems. According to the EPA (Environmental Protection Agency), readiness monitors, also known as emission monitors, assess the performance of your vehicle’s emission-related systems. When these monitors are “ready,” it indicates that the system has checked and passed the tests, a prerequisite for passing emission inspections.

To further elaborate, here are key aspects of what it means to get OBD2 monitors ready:

• Emission Control Systems Testing: OBD2 monitors are designed to test various components of the emission control system, such as the oxygen sensors, catalytic converter, EVAP system, and EGR system. As noted in SAE J1979, these tests ensure that each component functions within acceptable parameters.
• Completion of Self-Tests: Each monitor runs a specific diagnostic routine. When a monitor is ready, it means that this routine has been completed successfully. Conversely, if a monitor is not ready, it means that the test either hasn’t run or failed.
• Readiness for Inspection: Many states require vehicles to pass an emission test to be legally driven. These tests often check the status of OBD2 monitors. If too many monitors are not ready, the vehicle will fail the inspection.
• Resetting After Clearing Codes: When diagnostic trouble codes (DTCs) are cleared, the readiness monitors are reset and must run again. According to a study by the California Air Resources Board (CARB), clearing DTCs can mask underlying issues, which is why monitors must reset.
• Types of Monitors: There are continuous and non-continuous monitors. Continuous monitors, like those for misfire, fuel system, and comprehensive components, run constantly while the engine is operating. Non-continuous monitors, such as those for the catalytic converter and EVAP system, require specific conditions to be met before they can run.

2. What Are the Different Types of OBD2 Monitors?

There are primarily two types of OBD2 monitors: continuous and non-continuous. Continuous monitors run constantly while the engine is operating, while non-continuous monitors require specific conditions to be met before a test can be completed. The latest OBD2 standard no longer definitively categorizes each monitor, giving manufacturers more flexibility.

To provide a clearer understanding, here’s a breakdown of these monitor types:

• Continuous Monitors:
  • Misfire Monitor: Detects engine misfires that can cause increased emissions and damage to the catalytic converter. According to a study by the National Renewable Energy Laboratory (NREL), misfires can significantly increase hydrocarbon emissions.
  • Fuel System Monitor: Evaluates the fuel delivery system to ensure the correct air-fuel mixture. Proper fuel trim is essential for reducing emissions.
  • Comprehensive Component Monitor (CCM): Checks various sensors and components for proper operation. This includes sensors like the mass airflow (MAF) sensor and the coolant temperature sensor.
• Non-Continuous Monitors (Spark Ignition Vehicles – Gas):
  • Catalyst (CAT) Monitor: Assesses the efficiency of the catalytic converter in reducing harmful emissions. Data from the EPA shows that a properly functioning catalytic converter can reduce emissions by up to 90%.
  • Heated Catalyst Monitor: Evaluates the performance of heated catalytic converters, which reach operating temperature faster.
  • Evaporative (EVAP) System Monitor: Checks the fuel vapor recovery system for leaks. EVAP system leaks can release harmful hydrocarbons into the atmosphere.
  • Secondary Air System Monitor: Tests the secondary air injection system, which helps reduce emissions during cold starts.
  • Oxygen (O2) Sensor Monitor: Monitors the performance of the oxygen sensors, which are critical for fuel management.
  • Oxygen Sensor Heater Monitor: Checks the functionality of the oxygen sensor heaters, ensuring they reach operating temperature quickly.
  • EGR (Exhaust Gas Recirculation) and/or VVT System Monitor: Evaluates the EGR system, which reduces NOx emissions by recirculating exhaust gas into the engine.
• Non-Continuous Monitors (Compression Ignition Vehicles – Diesel):
  • NMHC Catalyst Monitor: Assesses the performance of the Non-Methane Hydrocarbon Catalyst.
  • NOx/SCR Aftertreatment Monitor: Checks the Selective Catalytic Reduction system to reduce NOx emissions.
  • Boost Pressure Monitor: Monitors the boost pressure in turbocharged diesel engines.
  • Exhaust Gas Sensor Monitor: Evaluates the performance of exhaust gas sensors.
  • PM Filter Monitor: Checks the particulate matter filter, which traps soot and other particles.
  • EGR and/or VVT System Monitor: Evaluates the EGR system, which reduces NOx emissions by recirculating exhaust gas into the engine.

3. Why is My OBD2 Monitor Not Ready?

An OBD2 monitor may not be ready due to several reasons, including recent diagnostic trouble code (DTC) clearing, power failures such as battery disconnection, or the need for specific driving conditions to complete the self-test. Clearing DTCs resets the monitor statuses, and these statuses are set to incomplete at the start of a new monitoring cycle.

Here are more detailed explanations for why an OBD2 monitor might not be ready:

• Recent DTC Clearing: When diagnostic trouble codes are cleared, the OBD2 system resets all readiness monitors. This action is often performed after a vehicle repair. According to a report by the Environmental Protection Agency (EPA), clearing codes without addressing the underlying issue can lead to unresolved problems during emission testing.
• Power Failure or Battery Disconnection: A loss of power, such as disconnecting the battery, can reset the OBD2 system and clear the readiness monitors. For instance, if you replace the battery, the monitors will reset.
• Incomplete Drive Cycles: Non-continuous monitors require specific driving conditions to run their self-tests. If these conditions are not met, the monitor will remain incomplete. This may involve driving at certain speeds, maintaining steady acceleration, and allowing the engine to cool down.
• Malfunctions or Pending Codes: The presence of active or pending diagnostic trouble codes can prevent certain monitors from running. The OBD2 system is designed to prioritize addressing existing issues before completing readiness tests.
• Fuel Level Requirements: Some monitors, such as the EVAP monitor, require the fuel level to be within a specific range (e.g., 35% to 85%) to initiate the diagnostic testing. If the fuel level is outside this range, the monitor will not run.
• Environmental Conditions: Certain monitors may be disabled if environmental conditions are not met. For example, the ambient air temperature may be too low or too high, preventing the monitor from running.
• Vehicle-Specific Requirements: The exact conditions required to run each monitor can vary by vehicle make and model. It is important to consult the vehicle’s service manual for specific drive cycle instructions.
• Monitor Dependencies: Some monitors must run and complete before others can start. If a prerequisite monitor is incomplete, subsequent monitors may also remain incomplete.

4. How Can I Check My OBD2 Monitor Status?

You can check your OBD2 monitor status using an OBD2 scanner. Connect the scanner to your vehicle’s OBD2 port, typically located under the dashboard, and select the “Readiness Monitors” or “I/M Readiness” option to view the status of each monitor. OBD Auto Doctor diagnostic software, available at OBD2-SCANNER.EDU.VN, can also be used to read monitor statuses and diagnostic trouble codes.

To provide a more detailed understanding, here are the steps and options you can use to check your OBD2 monitor status:

• Using an OBD2 Scanner:
  1. Purchase an OBD2 Scanner: You can buy a standalone OBD2 scanner from automotive stores or online retailers. Ensure it supports I/M readiness checks.
  2. Locate the OBD2 Port: Find the OBD2 port in your vehicle, typically located under the dashboard on the driver’s side.
  3. Connect the Scanner: Plug the OBD2 scanner into the port.
  4. Turn on the Ignition: Turn the ignition to the “on” position without starting the engine.
  5. Navigate the Scanner: Use the scanner’s menu to select “Readiness Monitors,” “I/M Readiness,” or a similar option.
  6. View the Status: The scanner will display the status of each monitor. Common statuses include “Ready” or “Complete” (indicating the test has passed) and “Not Ready” or “Incomplete” (indicating the test has not yet run or failed).
• Using Diagnostic Software (OBD Auto Doctor):
  1. Download and Install Software: Download OBD Auto Doctor from OBD2-SCANNER.EDU.VN and install it on your computer or mobile device.
  2. Purchase an OBD2 Adapter: You will need an OBD2 adapter that connects to your vehicle’s OBD2 port and communicates with your device via Bluetooth or USB.
  3. Connect the Adapter: Plug the OBD2 adapter into your vehicle’s OBD2 port.
  4. Pair the Adapter: If using Bluetooth, pair the adapter with your device.
  5. Launch the Software: Open OBD Auto Doctor.
  6. Connect to the Vehicle: Follow the software’s instructions to connect to your vehicle.
  7. Check Readiness Monitors: Navigate to the section for readiness monitors to view their status. The software will display which monitors are complete and which are not.
• Interpreting Monitor Status:
  • Complete/Ready: This indicates that the monitor has run and passed its self-test.
  • Incomplete/Not Ready: This indicates that the monitor has not yet run or has failed its self-test.
  • N/A (Not Available): This means that the vehicle does not support the monitor.
• Important Considerations:
  • Check Engine Light: Before checking the readiness monitors, ensure the check engine light is not illuminated. Active DTCs may prevent monitors from running.
  • Drive Cycle: If monitors are incomplete, you may need to perform a specific drive cycle to allow them to run.

5. What is an OBD2 Drive Cycle?

An OBD2 drive cycle is a series of specific driving conditions designed to allow your car’s onboard diagnostics to run and complete the readiness monitors. These cycles vary by car model and manufacturer, but typically involve a combination of city and highway driving. Many manufacturers include these cycles in the vehicle owner’s manual.

To provide a more detailed understanding, here are the key components and steps involved in an OBD2 drive cycle:

• Purpose of the Drive Cycle:
  • Run On-Board Diagnostics: The primary goal is to enable your car’s computer to run all necessary diagnostic tests.
  • Complete Readiness Monitors: These tests allow the readiness monitors to operate and detect potential malfunctions in the emission system.
• Generic OBD2 Drive Cycle: The following steps can be used as a guideline if a specific drive cycle is not known. However, it may not work for all cars and monitors.
  1. Cold Start:
     • Ensure the engine coolant temperature is below 50°C (122°F).
     • The coolant and air temperatures should be within 11°C (20°F) of each other.
     • Achieve these conditions by letting the car sit overnight.
  2. Ignition Key:
     • Do not leave the ignition key in the “ON” position before the cold start, as this may prevent the heated oxygen sensor diagnostic from running.
  3. Idling:
     • Start the engine and let it idle in drive for two and a half minutes.
     • Turn on the A/C and rear defroster if equipped.
  4. Acceleration and Steady Speed:
     • Turn off the A/C and rear defroster.
     • Accelerate to 90 km/h (55 mph) under moderate, constant acceleration.
     • Hold a steady speed for three minutes.
  5. Deceleration:
     • Slow down to 30 km/h (20 mph) without braking.
     • Do not depress the clutch if you are driving a manual transmission vehicle.
  6. Acceleration and Steady Speed (Again):
     • Accelerate back to 90-100 km/h (55-60 mph) at 3/4 throttle.
     • Hold a steady speed for five minutes.
  7. Final Deceleration:
     • Slow down to a stop without braking.
• Tips for Performing the Drive Cycle:
  • Safety First: Perform the drive cycle in a safe environment, such as a restricted area, as some steps may be difficult to follow under normal driving conditions.
  • Consult the Owner’s Manual: Check your vehicle’s owner’s manual for specific drive cycle instructions.
  • Fuel Level: Ensure the fuel level is between 1/4 and 3/4 full, as some monitors (e.g., EVAP) require a specific fuel level.
  • Avoid Hard Braking and Acceleration: Drive smoothly and avoid sudden changes in speed.
  • Monitor the Readiness Status: Use an OBD2 scanner to check the readiness monitor status before and after performing the drive cycle.
• Manufacturer-Specific Drive Cycles:
  • Different manufacturers may have unique drive cycle procedures. For example:
    • Ford: May involve specific idling times and driving at various speeds.
    • GM: Often includes a mix of highway and city driving with specific acceleration and deceleration patterns.
    • Toyota: Typically requires a cold start followed by a series of accelerations and decelerations.

6. How Long Does It Take for OBD2 Monitors to Become Ready?

The time it takes for OBD2 monitors to become ready varies depending on the vehicle, the specific monitors, and driving conditions. Generally, it can take from a few days to a week of combined city and highway driving. Performing a specific OBD2 drive cycle can expedite this process.

To provide a more detailed understanding, here are the factors that influence the time it takes for OBD2 monitors to become ready:

• Driving Conditions:
  • Combined City and Highway Driving: A mix of city and highway driving is often necessary to meet the conditions required by various monitors. City driving typically involves frequent stops and starts, while highway driving allows for sustained speeds.
  • Consistent Driving Patterns: Consistent driving habits that match the requirements of the drive cycle can help monitors run more quickly.
• Vehicle Make and Model:
  • Manufacturer-Specific Requirements: Different manufacturers have different requirements for their OBD2 systems. Some vehicles may require more complex or longer drive cycles.
  • Vehicle Age: Older vehicles may take longer to complete readiness monitors compared to newer models.
• Monitor Type:
  • Continuous Monitors: These monitors run constantly while the engine is operating and typically become ready relatively quickly.
  • Non-Continuous Monitors: These monitors require specific conditions and may take longer to complete. For example, the EVAP monitor often requires a specific fuel level and a period of inactivity.
• Mechanical Condition:
  • Underlying Issues: Mechanical problems or pending diagnostic trouble codes (DTCs) can prevent monitors from running. Addressing these issues is crucial for achieving readiness.
  • Sensor Performance: Properly functioning sensors are essential for accurate readings and completing readiness tests.
• Use of a Drive Cycle:
  • Expediting the Process: Performing a specific OBD2 drive cycle can significantly reduce the time it takes for monitors to become ready.
  • Following Instructions: Adhering to the drive cycle instructions is crucial for its effectiveness.
• Environmental Factors:
  • Temperature: Certain monitors may be affected by ambient temperature. For example, extremely cold or hot temperatures can prevent some monitors from running.
• Typical Time Frames:
  • Few Days of Driving: Some monitors may become ready after just a few days of normal driving.
  • One Week of Driving: It typically takes about one week of combined city and highway driving to allow all monitors to reach complete status.
  • Extended Periods: In some cases, it may take longer than a week, especially if the vehicle has underlying issues or if the required driving conditions are not consistently met.

7. What Happens If My OBD2 Monitors Are Not Ready for Inspection?

If your OBD2 monitors are not ready for inspection, your vehicle will likely fail the emission test. The US Environmental Protection Agency (EPA) guidelines allow up to two monitors to be not ready for 1996 through 2000 model year vehicles, and only one monitor for 2001 and newer vehicles.

To provide a more detailed understanding, here’s a breakdown of the implications and steps to take if your OBD2 monitors are not ready for an inspection:

• Failure of Emission Test:
  • Test Result: Your vehicle will fail the emission test if the required number of monitors are not in a “ready” or “complete” state.
  • Rejection: You will be unable to renew your vehicle registration until the issue is resolved and the vehicle passes the emission test.
• EPA Guidelines:
  • 1996-2000 Model Year Vehicles: The EPA allows up to two monitors to be “not ready.”
  • 2001 and Newer Model Year Vehicles: Only one monitor can be “not ready.”
• Consequences of Failure:
  • Inability to Register Vehicle: You will not be able to register or renew the registration of your vehicle.
  • Fines and Penalties: Some states may impose fines or penalties for driving a vehicle with expired registration.
  • Mandatory Repairs: You may be required to perform necessary repairs to bring your vehicle into compliance.
• Steps to Take:
  1. Check Readiness Monitors: Use an OBD2 scanner to identify which monitors are not ready.
  2. Address Underlying Issues:
     • Diagnostic Trouble Codes (DTCs): Check for any active or pending DTCs and address them.
     • Mechanical Issues: Repair any mechanical problems that may be preventing monitors from running.
  3. Perform a Drive Cycle:
     • Vehicle-Specific Drive Cycle: Consult your vehicle’s owner’s manual for the specific drive cycle procedure.
     • Generic Drive Cycle: If a vehicle-specific drive cycle is not available, follow a generic drive cycle.
  4. Allow Time for Monitors to Run:
     • Normal Driving: Drive your vehicle for several days, combining city and highway driving.
     • Monitor Readiness Status: Periodically check the readiness monitor status using an OBD2 scanner.
  5. Re-Test:
     • After Completion: Once all required monitors are in a “ready” state, take your vehicle for another emission test.
• Important Considerations:
  • Avoid Clearing Codes Before Testing: Clearing DTCs resets the readiness monitors and can cause your vehicle to fail the test.
  • Fuel Level: Ensure the fuel level is within the recommended range (typically between 1/4 and 3/4 full) before performing a drive cycle.
  • Battery Condition: A weak or failing battery can cause the OBD2 system to reset. Ensure your battery is in good condition.

8. Can I Complete an OBD2 Drive Cycle on the Highway?

Yes, you can complete parts of an OBD2 drive cycle on the highway, particularly those that require maintaining a steady speed. However, some steps, like idling and decelerating without braking, may be difficult to perform safely on a busy highway. Therefore, it is best to perform the drive cycle in a restricted area or during off-peak hours.

To elaborate further, here’s a breakdown of the highway’s suitability for various stages of an OBD2 drive cycle:

• Highway Driving: Suitable Stages:
  • Maintaining Steady Speed: The highway is ideal for maintaining the steady speeds required in many drive cycle steps. For example, driving at 55-60 mph for several minutes is easily achievable on the highway.
  • Moderate Acceleration: Accelerating to highway speeds under moderate, constant acceleration can also be performed safely.
• Highway Driving: Unsuitable Stages:
  • Idling: Idling for extended periods is not practical or safe on the highway.
  • Deceleration Without Braking: Slowing down from highway speeds to lower speeds without using the brakes is risky and can disrupt traffic flow.
  • Cold Start: The cold start portion of the drive cycle needs to be initiated before entering the highway.
• Safety Considerations:
  • Traffic Conditions: Avoid performing drive cycle steps during peak traffic hours.
  • Other Drivers: Be mindful of other drivers and avoid any actions that could endanger yourself or others.
  • Legal Speed Limits: Adhere to posted speed limits and traffic laws.
• Combining Highway and City Driving:
  • Hybrid Approach: A combination of highway and city driving is often the most effective way to complete a drive cycle.
  • City Streets: Use city streets for steps that require idling, low-speed driving, and decelerating without braking.
• Alternatives to Highway Driving:
  • Restricted Areas: Industrial parks, empty parking lots, and quiet country roads can provide a safer environment for performing drive cycle steps.
  • Off-Peak Hours: Driving during off-peak hours can reduce traffic congestion and make it easier to perform the drive cycle steps.
• Steps That Can Be Performed on the Highway:
  1. Acceleration to 55-60 mph: Accelerate smoothly to the desired speed.
  2. Maintaining Steady Speed: Drive at a constant speed for the specified duration (e.g., 3-5 minutes).
  3. Moderate Acceleration at 3/4 Throttle: Accelerate moderately to simulate 3/4 throttle, if required by the drive cycle.
• Example:
  • Generic OBD2 Drive Cycle:
    • Steps 4 and 6, which involve maintaining steady speeds at 55 mph and then 55-60 mph, can be performed on the highway.
    • Steps 3, 5, and 7, which involve idling and decelerating without braking, should be performed elsewhere.

9. Will Disconnecting My Car Battery Reset OBD2 Monitors?

Yes, disconnecting your car battery will reset your OBD2 monitors. This happens because disconnecting the battery erases the stored data in the vehicle’s computer, including the readiness monitor statuses.

To provide a more detailed understanding, here’s why disconnecting the car battery resets OBD2 monitors and what you should consider:

• How Battery Disconnection Resets OBD2 Monitors:
  • Memory Reset: Disconnecting the battery removes power from the vehicle’s electronic control unit (ECU), which includes the memory that stores the readiness monitor statuses. As a result, the monitors are reset to their default “not ready” state.
  • Loss of Stored Data: All temporary data, including diagnostic trouble codes (DTCs), freeze frame data, and adaptive learning parameters, are erased.
• Implications of Resetting OBD2 Monitors:
  • Emission Testing: If you disconnect your battery shortly before an emission test, your vehicle will likely fail because the monitors will not have had enough time to complete their self-tests.
  • Drive Cycle Requirement: After reconnecting the battery, you will need to perform a drive cycle to allow the monitors to run and complete their tests.
• When Battery Disconnection Is Necessary:
  • Maintenance and Repairs: There are times when disconnecting the battery is necessary for maintenance or repair work, such as replacing the battery, working on the electrical system, or performing certain engine repairs.
  • Safety Precautions: Always disconnect the battery when working on electrical components to prevent electrical shock or damage to the vehicle’s systems.
• Steps to Take After Reconnecting the Battery:
  1. Check for DTCs: Use an OBD2 scanner to check for any stored diagnostic trouble codes (DTCs) after reconnecting the battery.
  2. Perform a Drive Cycle: Follow the vehicle-specific drive cycle procedure to allow the readiness monitors to run and complete their self-tests.
  3. Monitor Readiness Status: Use an OBD2 scanner to check the readiness monitor status periodically while driving.
  4. Allow Time for Completion: Give the vehicle several days of normal driving, including a mix of city and highway conditions, to allow all monitors to reach a “ready” state.
• Alternatives to Disconnecting the Battery:
  • Memory Savers: If you need to maintain the vehicle’s memory while disconnecting the battery, you can use a memory saver. This device plugs into the OBD2 port or uses a 12V accessory outlet to provide power to the ECU while the battery is disconnected.
• Example:
  • Scenario: You need to replace your car battery.
    1. Disconnect the old battery.
    2. Install the new battery.
    3. Reconnect the battery cables.
    4. Use an OBD2 scanner to check for DTCs.
    5. Perform the vehicle-specific drive cycle.
    6. Monitor the readiness monitor status over the next few days.

10. How Can OBD2-SCANNER.EDU.VN Help Me Get My OBD2 Monitor Ready?

OBD2-SCANNER.EDU.VN offers comprehensive information and resources to help you understand and resolve OBD2 monitor issues. Our website provides detailed guides, troubleshooting tips, and software solutions like OBD Auto Doctor to read monitor statuses and diagnostic trouble codes, ensuring you are well-prepared for emission testing.

To further illustrate how OBD2-SCANNER.EDU.VN can assist you, here’s a detailed overview of the resources and services we offer:

• Comprehensive Guides and Tutorials:
  • Detailed Explanations: We provide in-depth explanations of OBD2 systems, readiness monitors, and diagnostic trouble codes (DTCs).
  • Step-by-Step Instructions: Our guides offer step-by-step instructions on how to use OBD2 scanners, interpret monitor statuses, and perform drive cycles.
  • Troubleshooting Tips: We offer troubleshooting tips for addressing common issues that prevent monitors from becoming ready.
• OBD Auto Doctor Diagnostic Software:
  • Reading Monitor Statuses: Our software allows you to easily read the status of all OBD2 monitors.
  • Reading Diagnostic Trouble Codes (DTCs): Identify any active or pending DTCs that may be preventing monitors from running.
  • User-Friendly Interface: Our software features a user-friendly interface that makes it easy to navigate and interpret diagnostic information.
• Vehicle-Specific Information:
  • Drive Cycle Procedures: We provide vehicle-specific drive cycle procedures to help you complete readiness monitors more quickly.
  • Common Issues: Learn about common OBD2 issues specific to your vehicle make and model.
• Expert Advice and Support:
  • Contact Us: Reach out to our team of automotive experts for personalized advice and support.
  • Troubleshooting Assistance: Get help troubleshooting complex OBD2 issues.
• Additional Resources:
  • Blog Articles: Explore our blog for informative articles on OBD2 systems, vehicle maintenance, and emission testing.
  • FAQ Section: Find answers to frequently asked questions about OBD2 monitors and related topics.
• Contact Information:
  • Address: 123 Main Street, Los Angeles, CA 90001, United States
  • WhatsApp: +1 (641) 206-8880
  • Website: OBD2-SCANNER.EDU.VN
• Benefits of Using OBD2-SCANNER.EDU.VN:
  • Save Time and Money: By diagnosing and resolving OBD2 issues yourself, you can avoid costly trips to the mechanic.
  • Ensure Emission Test Readiness: Prepare your vehicle for emission testing and avoid failing due to incomplete monitors.
  • Improve Vehicle Performance: Address underlying issues that may be affecting your vehicle’s performance and fuel efficiency.
• Example Scenario:
  • Problem: Your vehicle failed an emission test because the catalyst monitor was not ready.
    1. Visit OBD2-SCANNER.EDU.VN and download OBD Auto Doctor.
    2. Use the software to read the DTCs and identify any underlying issues.
    3. Follow our vehicle-specific drive cycle procedure to run the catalyst monitor.
    4. Check the readiness monitor status periodically until the catalyst monitor is ready.
    5. Re-test your vehicle and pass the emission test.

Is your check engine light on or are you concerned about failing your next emissions test? Contact OBD2-SCANNER.EDU.VN at 123 Main Street, Los Angeles, CA 90001, United States, via Whatsapp at +1 (641) 206-8880, or visit our website at OBD2-SCANNER.EDU.VN for expert advice and assistance today; we’re here to help get your OBD2 monitor ready.