Caddy's Service Engine Soon light is on...
So the used 2002 Cadillac Seville we picked up a couple weeks ago turned on it's very uninformative Service Engine Soon light the other day. It's running great and everything except it says it is only getting 12.9 MPG eep. But that's all real short distance driving. It came on right after I filled it up with 89 Octane gas instead of 87. This is only the second time we've filled it. I would be thinking it could be an O2 sensors, but anyone else have some ideas?
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