Cool Gas Cap And Check Engine Light On Ideas. Yes, a loose gas cap can turn on the check engine light (cel), primarily on vehicles built after 1996. The warning signs could contain words such as “check engine’, “check powertrain” at times, the light could be a representation of the engine itself.

An illuminated check engine light is another symptom of a potential issue with the vehicle’s gas cap. Discover more details below on the various reasons your check engine light comes on after getting gas. Our mechanic has turned it off twice and said we might need to do a smoke test, or i think that’s what he said.





