Hello to the group,
I am having a problem again with my service engine light coming on. Over the summer I posted a note to this group about my truck being difficult to start once it was warmed up. It was the fuel pressure regulator as a few people here told me. We fixed that.
Now it is a more difficult problem. The 'service engine light' is on. I have tightened the gas cap (I even replaced it), and the other day my mechanic put it on his analyzer and reset it. He said he thinks it's the O2 sensor this time. But I thought there was more then one O2 sensor (?). Anyway, he made the light go off, but after I drove about 10 miles, it came back on again. It is a 2000 GMC Sierra 1500, 4WD, with a 4.8L vortec engine. I realize this may not be enough information, but it is all I have. The truck seems to run fine. There's no other symptoms. Just that damn light.
Anyone have any suggestions?
TIA, Joe