Failing a smog check can be stressful, but it’s not the end of the road. Most failures are due to minor issues that can be fixed quickly and affordably. Knowing what causes the failure is the first step to finding the right solution.
Common Reasons for Smog Check Failure
Smog check failures typically happen due to problems with the emissions system. This could include a faulty oxygen sensor, old spark plugs, or a malfunctioning catalytic converter. Even something as simple as a loose gas cap can trigger a failure.
Diagnostic Testing After a Smog Check Failure
After failing a smog check, it’s important to get a diagnostic test. A certified mechanic can use a scan tool to identify trouble codes and pinpoint the source of the problem. This helps ensure you don’t waste money fixing the wrong parts.
Fixing Emissions System Components
Most common fixes include replacing oxygen sensors, repairing the EGR valve, or changing the catalytic converter. These components play a key role in passing your next smog check. Keeping up with regular maintenance can prevent future issues.
Retesting Your Vehicle for a Smog Check
Once repairs are complete, your vehicle must be retested. Some states offer a free retest within a limited period. Make sure the engine has been driven enough to reset the onboard diagnostics before heading back to the smog check station.
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