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2001 Ford Expedition Question: what does service engine light soon mean?
Answer #1Greg's Orange Auto (15188 Answers) , Orange, CA - (714) 361-9386globalhelper January 18, 2012, 08:47Master
your pcm has picked up a code from a sensor that is seeing abnormal readings have it scanned and see what code you have. auto zone will do that for free. the code only means abnormal readings but it could be the circuit,the sensor or related components so don't just start throwing parts at it
Answer #2jermam March 28, 2012, 01:45Rookie
try a new gas cap and make sure it is on tight $8-$10 for new