Turn off the engine vehicle.
How to fix check engine light from gas cap.
If you find that the light keeps coming on and goes off again once you tighten the gas cap then your gas cap is too loose.
If it s for gas cap failure the fixing will take a mere few minutes.
You can either tighten the cap and wait for the system to reset itself when it determines the problem is fixed or you can use an obd ii code scanner to manually reset the system.
An illuminated check engine light is another symptom of a potential issue with the vehicle s gas cap.
If your gas cap is not properly attached you may see a check engine light or a loose cap warning light on the dash.
The door is usually locked you ll find a push button to unlock it.
Check engine light comes on.
I put together a video discussing a problem my neighbor had with nissan maxima four door sedan after they filled the fuel tank.
This may result in a gasoline odor from the vehicle as a result of the escaping vapors.
Open the gas cap door.
Once you ve noticed the check engine flashing don t worry.
The check engine light should go off after you drive for several minutes if the light was caused by a loose gas cap.
The gas cap code and diy check engine light car repair the gas cap code is a common diagnostic trouble code that might turn your check engine light on.