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Old 04-20-2010, 08:51 PM
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Check Engine Light

I had the rear main seal replaced at the dealership today and everything was well. Drove to Fort Drum (about 30 miles) for the Volunteer of the Year awards ceremony, got gas afterward, and drove back home (another 30 miles). Just as I got into town, the Check Engine light came on.

I thought maybe a loose gas cap so I pulled into a gas station, unscrewed and re-tightened my gas cap, and that seems to be alright. Check engine light stayed on. It's solid on, not blinking. Took it home and I don't see anything obviously wrong with the Jeep - nothing is leaking, all the gauges are normal, all the various caps on things under the hood are on and in place as far as I can tell.

I did hear a kind of funny sound when doing really tight turns, like a squealing sort of sound, but that might be something completely unrelated? (I have had a new steering stabilizer put in recently and wonder if that maybe has something to do with the sound?)

I am going to call the dealership tomorrow morning when I get up to see if I can bring it in to get it diagnosed. I am assuming diagnosing the issue would not take very long. I gather that as long as the light is on solid, it would be okay for me to drive it with the light on? (That might be a dumb question, however, please bear with me. I don't know a whole lot about vehicles.)
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Old 04-21-2010, 07:06 AM   #2
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As long as the thing seems to be running fine then be careful but sure. The second you notice something amiss then consider pulling over. That light is there for a reason. And realize that things can just plain out go bad. Don't need a reason other than the part's time has come. Don't jump to the conclusion of ineptitude on the part of the dealership. Though that can not be completely ruled out.

Thank you.

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Old 04-21-2010, 08:32 AM   #3
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You can get the code yourself. Turn the key OFF-ON-OFF-ON-OFF-ON and the code will display in the odometer window.
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Old 04-21-2010, 09:32 AM
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Neil - That is GREAT information! Thank you. I am definitely going to write this down (so I don't forget) for next time this happens, if ever.

I did take it back to the dealership this morning since it is on my way to work. They checked the code for me right away and told me it was the downstream oxygen sensor, but that it was an odd code and possibly caused by the fact that they had disconnected "it" (whatever it is) when they replaced the rear main seal on my Jeep yesterday. They said if it comes on again, to come back and get it fixed. So far, so good. Hasn't come on on my way to work (30-odd miles). It will be about $50 for a new sensor and a couple of dollars to have it put in since it won't take more than 20 minutes, they said. They have the sensor in stock, so if I need it, I can have it done tomorrow.
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