Can You Pass Smog with the Check Engine Light On?: 1 Minute to Find Out If Your Vehicle Will Pass Smog Check

Wondering if you can pass a smog check with the check engine light on? The answer is generally no. The check engine light is there to indicate that there's a problem within the vehicle's emission system, which is directly related to smog tests. If your check engine light is illuminated, it typically means that your vehicle will fail the test.

Many states have strict regulations that require all warning lights on the dashboard, including the check engine light, to be off prior to testing. Some places might allow you to run a smog test if the light is on but not flashing, and if you have a recent diagnostic report showing the issue is being addressed. However, it's crucial to check your local regulations.

Before scheduling your smog check, consider getting a diagnostic test to identify the problem triggering the check engine light. Fixing the issue can not only help you pass the smog test but also ensure your car runs more efficiently.

Tips to Prepare for Your Smog Check:

1. **Check for Diagnostic Codes**: Use an OBD-II scanner to see what codes are causing the check engine light to illuminate.

2. **Repair Issues Promptly**: Address any necessary repairs or maintenance needed to make your vehicle compliant.

3. **Clear Codes Properly**: Once repairs are made, clear the error codes and drive the vehicle for a certain number of miles before taking the test, as this allows the computer to reset.

FAQ

Q: What should I do if my check engine light is on before a smog test?A: Address the issue causing the light to be on and ensure it's fixed before undergoing the smog test.

Q: Can I get a smog check if my check engine light is off but comes on intermittently?A: It’s best to diagnose the issue before the test, as occasional lights might indicate a problem that could lead to a failed test.