My wife's check engine light came on a few months ago. A year ago our mechanic replaced the O2 sensor. This worked for a few months. Then it came on again. He had the computer checked..came out clean, then cleaned all the ground points...I think he said there are 4. The light went off until a few months ago. Mileage is about 127k. Anybody have any ideas?
Thanks.
Tom
Thanks.
Tom