Jeep Grand Cherokee Check Engine Light?

Question

My 1999 Jeep Grand Cherokee was out of commission for about a month because it wouldn't start. I had it towed to the dealership, and got it fixed 3 days ago. They replaced the CAM Sensor and the CAM Drive. Don't ask me what those things are, I have no idea how cars work. They told me I had to drive it 100-150 miles before I could get my state inspection sticker done. I guess if I had gone before then it would have failed. Yesterday (so 2 days after I got it back, and about 100 miles later -- right before I was going to go try for my inspection sticker), the check engine light came on. I called the Jeep dealer again and they wanted $95 to run a diagnostic on it. Google searching told me to do the on-off-on-off-on thing to pull the codes in the odometer, so I did. I got P0138 which I looked up and apparently that's something to do with the O2 sensor. Is the O2 sensor related to what they did with the CAM sensor and the CAM drive or could it possibly a result of not running the car for a month? I know that it's probably totally unrelated, but I don't know much about cars so I was hoping someone could help me understand instead of me just blindly accepting what the dealership says.

On a side note, I had some bearings replaced at that dealership once and then they needed replacing again a short time later (another shop found this problem) so I brought the car back to the original shop and put in a warranty claim on the work they did previously. While they were fixing it they broke my axle, but made me pay for that and claimed they were doing me a favor by not charging for the bearings again since the bad axle caused the bearings to go bad in the first place. I WISH there was another Jeep dealer nearby, but there's not. Between past experiences and differences in pricing and quotes I just don't trust these people.

Answer 1

the o2 (oxygen) sensor is in the exhaust downpipe. if you go underneath the car and look. its the first sensor you find on the exhaust from the engine end. Check the connector is connected and that the sensor isn't loose. take it out and give it a wipe with a dry cloth. and check the connections are clean.

then put it back in and hope the light goes out!



I think when these fail the fuel injection goes into open loop. which means that fuel consumption will usually be horrendous. but in a Jeep I'd doubt you'd notice lol!

Answer 2

Front differential bearings?

I have one of these and all I can say is it's an eternal problem. My check engine light comes on all the time and I finally decided I could take it in forever and it would keep coming on. What I do is disconnect the battery for a while to reset the light, get it in and get it smoged and then don't worry about it for another 2 years.



The front ends are crap and the computers are crap and once they get a lot of miles on them it's just one thing after another. I just had the front drive train disabled rather than fix the whole thing again and the next time it breaks down I'm going to part it out on ebay or just sell it for parts. The resale value on these isn't worth the couple grand a year I spend fixing it, especially considering how little I drive it.



I wish I had better news than that for you. From now on, nothing but Toyotas for me. I've had 4 of those and almost 800,000 combined miles and besides brakes and things that are supposed to wear I have a total of $50 in repairs between the 4 cars. That's it, one oil leak. Amazing.

Answer 3

has the automobile been in an twist of fate or had any aftermarket decide for ingredient further which you realize of? i accept as true with you, o2 sensor no longer rather, wiring situation greater advantageous than probably. i doubt if that's the harness, greater like a short someplace that could result the pcm subsequently placing the code. Now, merely ought to make sure to boot to the headlight change being became on, the quick( i anticipate that's a short) is placing the code by skill of effecting yet another decide for area, like possibly the alternator someway. i've got self belief that has an inner prevalent (interior the alt.). i wish you success in this one my pal, decide for issues may be a nightmare as you realize and is why shops fee $a hundred.00 hr. each and every now and then to diagnose decide for issues. playstation : a minimum of once you reset, the sunshine continues to be off so that's not a complicated code, yet, that is easier to diagnose yet. probably greater high priced to repair.