If the light is on because of the gas cap...
A) It will clear itself after a few trips
B) a code reader to clear it.
This assumes you replaced the cap with a proper cap that seals correctly and
you are talking about an ODB-II car. You don't list the year of the car,
but then again I don't know if the OBD-I cars would light the check engine
light for a gas cap issue.
I don't believe it is the duration of the driving - but the cycling of
starting and stopping the engine several times. That's how I cleared
the code on a previous car of mine in the same situation. It basically
went away after a couple of days of my normal driving around town,
couple trips a day.
'07 Ody EX
The Code reader is a good investment, doesn't have to be a top of the
line model! Best $90 bucks I've invested, since dealers around here
charge about $50 just to hook one up and read the codes.... that's
before doing any work on it! Checking the codes will also make sure you
aren't having other problems.
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