Q: I have the service engine light on

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Service light is on, I've check the gas cap only, the car is running good I don't feel that anything is wrong with it

My car has 38900 miles.
My car has an automatic transmission.

The computer should be scanned to see why the Check Engine Light is on by a mechanic. The Check Engine Light is an indication that the computer has a fault in the systems that it monitors and has set a code to help diagnose the problem. The vehicle’s running condition may not be changed even though the system has a problem. A thorough pinpoint test for the codes received will narrow the problem down so it can be repaired. The gas cap could cause the light to be on and set a code. A test is needed to see if it is the cause or it is another problem.

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