Need sacto area shop to help with 4.0 Check Engine codes [Archive]


Pirate4x4.Com > Brand Specific Tech > Jeep - Hardcore Tech > Need sacto area shop to help with 4.0 Check Engine codes PDA : Need sacto area shop to help with 4.0 Check Engine codes SeanP 09-16-2002, 12:01 PM I am normally pretty self sufficient, but I've got Check Engine code #21 that keeps plaguing me. 97 4.0, stock, OBD-II. My Factory Service Manual says front O2 sensor which I have replaced twice. I clear codes by disconnecting battery for a few minutes, then run the vehicle. Idles fine and then after about 15 minutes of idleing, there is that damn light. Using the old on-off-on-off-on trick the codes read 12, 21, 55. I don't want to go to the dealer, but I need a shop that has full diagnosis equipment for this Chrysler engine. Any suggestions? SeanP Sundowner 09-16-2002, 12:24 PM the 12 is a battery disconnect code, it just means that your battery has been disconnected in the past 50 key-on cycles. 55 is end of codes. I'll bet you a dollar that you have a wiring problem on your front o2 sensor. follow the wiring alongside the iol pan and up to the intake manifold. you may havea melted wire on one of the manifolds. and make sure that the connector on the oil pan backet is in good condition with none of the prongs pushed out and slathered with di-electrc grease. SeanP 09-16-2002, 12:32 PM Yep, I tracked this wiring up to the manifold, alongthe fuel rail and into the wiring harness. It all looks solid. SeanP Keith Strong 09-16-2002, 01:34 PM Your motor is cooked.....I'll give ya $100 complete for it :flipoff2: ;) Seriously though, pony up and hit the dealer :( I dont know of anyone to refer ya to that I would trust :( SeanP 09-16-2002, 01:41 PM thanks keith. Actually, I will be selling this current motor (from 98 XJ with 28K miles) when I stroke my 97 this winter. SeanP Keith Strong 09-16-2002, 02:24 PM PM me a price, and details.....I MIGHT be interested ;) Jes 09-16-2002, 03:00 PM Sean, you aren't going to flake out on Moab because of this are you? :flipoff2: Jes SeanP 09-16-2002, 03:06 PM Originally posted by Jes Sean, you aren't going to flake out on Moab because of this are you? :flipoff2: Jes, I have been driving with a check engine light for about a year. What do you think? I just need to get my shiat smogged. I still am not sure if marni is going yet. SeanP Jes seRob 09-21-2002, 12:27 PM hmmm... I thought a 21 error code could be for either sensor? Might wanna check the one at the cat also before spending the $$$ at the dealer.