Can you clear engine codes to pass emissions?

Do's and Don'ts

DO take your vehicle in for service promptly if the "Check Engine" or "Service Engine Soon" light comes on and stays lit. Ignoring this light is ill-advised, as it indicates a problem that could increase emission levels, even if the vehicle appears to be running smoothly.

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One item you can check easily is the gas cap. A loose or broken gas cap will cause the Check Engine light to come on. The light may turn off by itself once the gas cap is properly tightened.

When a Check Engine Light illuminates, the vehicle's engine computer might enter a "back-up" or "limp-home" mode, allowing the vehicle to continue operating until you can make repairs. However, these modes are not optimal for emissions or fuel efficiency, necessitating prompt repairs.

DO check with your local dealer to see if your vehicle's OBD-II system issue might be covered under warranty or recall. Emission-related components could be warrantied for up to 8 years or 80,000 miles, whichever comes first.

DO get your annual emission test early. The test is valid for 90 days on renewals and private party transactions. If the emission test reveals an issue, early testing provides time to address the problem before your registration expires.

DON'T drive your vehicle if the "Check Engine" or "Service Engine Soon" light is flashing. A flashing light signifies a severe issue that could damage costly emission control systems. Have your vehicle serviced immediately to avoid expensive repairs like a ruined catalytic converter.

DON'T take your vehicle for an emission test right after replacing a battery or if it was recently disconnected or cranking slowly. A battery dropping below five volts could erase the vehicle’s computer memory, leading to a test rejection. Drive the vehicle under various conditions for up to one week to reset the OBD-II system's diagnostics.

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If your license plates are expired or nearing expiration, visit your nearest DMV office for a movement permit. A week of regular driving usually suffices for emission test readiness. For any queries, contact the Department of Motor Vehicles Emission Control Lab in your area: (702) 486-4981 in Las Vegas or (775) 684-3580 in Reno.

DON'T clear any Data Trouble Codes using a scanner to pass the emission test. Clearing these codes erases all OBD-II system memory settings, resulting in test rejection. The vehicle must be driven under varying conditions for up to a week to reset. Erasing codes may also conceal problems, complicating diagnosis and repair.

DON'T take the vehicle for a test if you have a device monitoring your driving habits plugged into the OBD port. These devices must be removed before testing, or the vehicle will fail the emission test.

Does your state require an emissions check before renewing your registration? These checks ensure your vehicle is not emitting harmful pollutants. Most states now use an OBD-II test to verify compliance with U.S. Environmental Protection Agency (EPA) standards.

To pass an OBD-II emissions test, a vehicle must:

• Have a functional 'Check Engine' light and OBD port
• The 'Check Engine' light must be off
• Successfully complete the OBD-II system monitors built into the vehicle

If you clear the 'Check Engine' light or reset the OBD-II monitors right before your emissions test, your vehicle typically will not pass because the catalyst and EVAP monitors need time to run. You might need to drive your vehicle for several more days, allowing any trouble codes and the 'Check Engine' light time to recur. If the light reappears, you'll need to address the fault, then drive around for a few days before your state will consider your vehicle "ready" for an emissions test. If it's not in a "ready" state, your vehicle will automatically fail.

Using OBDLink, you can easily monitor emissions readiness after fixing an emissions problem, and be assured that your vehicle is in a "ready" state. You can also pre-test your vehicle and confirm that it will pass without issue. Here's how:

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1. Connect to the OBDLink app
2. Tap 'Monitors'
3. In the top right corner, click the menu icon to choose which state you reside in
4. The screen will automatically populate with either a "Not Ready" warning or a "Ready" green check