Can Car Check Engine Lights Clear Themselves?
Introduction
The check engine light (CEL) is a dashboard indicator that illuminates when the engine control unit (ECU) detects a problem with the vehicle’s emissions control system. The CEL can be triggered by a variety of issues, including:
* Faulty oxygen sensor
* Catalytic converter problems
* Evaporative emissions control system leaks
* Mass airflow sensor problems
* Spark plug or ignition coil issues
In most cases, the CEL will remain illuminated until the underlying problem is resolved. However, there are some instances where the CEL may clear itself.
When Will the CEL Clear Itself?
The CEL may clear itself if the underlying problem is temporary or intermittent. For example, if the CEL is triggered by a loose gas cap, the light may turn off after the gas cap is tightened. Similarly, if the CEL is triggered by a temporary engine misfire, the light may turn off once the engine is running smoothly again.
In some cases, the CEL may also clear itself after a certain amount of time has passed. This is because the ECU may reset itself after a period of time, which can clear any stored diagnostic trouble codes (DTCs).
How to Clear the CEL
If the CEL is not clearing itself, you can try to clear it manually. To do this, you will need a code reader or scan tool. These devices can be purchased at most auto parts stores.
Once you have a code reader, connect it to the vehicle’s diagnostic port. The code reader will then display any DTCs that are stored in the ECU. You can then clear the DTCs and see if the CEL turns off.
What to Do If the CEL Comes Back On
If the CEL comes back on after you have cleared it, it is important to have the vehicle inspected by a qualified mechanic. The mechanic can diagnose the underlying problem and repair it so that the CEL does not come back on.
Conclusion
The CEL is an important warning light that should not be ignored. If the CEL is illuminated, it is important to have the vehicle inspected by a qualified mechanic to diagnose and repair the underlying problem. In some cases, the CEL may clear itself, but it is not advisable to rely on this happening.
