Join Date: Apr 2007
Location: Jackson, MS USA
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Go to an auto parts store or a buddy and get them to read the code for you with a code reader. It's still stored in the memory even though the MIL is off. On some codes it will continue to check to see if the malfunction is present and if not after X number of ignition cycles it will clear the turn the MIL off.
On the gas cap, it's part of the EVAP system and if you recently filled up and didn't put the gas cap on just right, it might not have sealed. Taking off the gas cap and re-installing it might cure it, or just tightening it might do it. Something else that causes pressure loss or whatever in the EVAP system might cause it to throw the same code also.
Likely your code is associated with this but you never know until you get it checked. It could be telling you something else was out of parameters... in any case it's good to check it and clear it if it's of no value any more.