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Old 09-20-2010, 12:04 PM
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Location: Tuscaloosa, AL
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P0202, p0303

Hello. I'm a new Jeep owner. Shortly after getting it I get the codes listed above. I put in new plugs and the codes went away . . . for a couple weeks. Now they are back. Unfortunately, I am not a fix-it-yourself kind of guy. Is this dangerous to drive with? Is there anything I can do to try and fix easily or do I need to bring it in? Thanks!
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Old 09-20-2010, 12:11 PM   #2
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I had the same problem I changed plugs, wire's ,cap rotar and coil It runs real good now good as a 2.5 can get ..
Think I had $60 total in it . Make sure you check the gaps on plugs they say preset but I find most times they are not ..

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Old 02-06-2011, 10:43 AM   #3
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My jeep giving the same 0202 and 0203 codes. Also a cylinder 2 misfire. Had the jeep for month or so and it ran fine until I changed the cap/rotor/wires/plugs. Im wondering if these parts cause the code and maybe we need to use oem parts?
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Old 02-14-2011, 08:19 AM   #4
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Got it fixed. Turned out to be a broken ground on the #2 injector. The mechanic explained that in this scenario the ECM will tell the injector to stay open all the time. When it was running I could actually smell gas so strong. Another weird side effect of this injector staying open was fuel leaking out through the intake gasket onto the exhaust manifold. I saw fluid there and thought it was coolant caused by a blown head gasket (which is why I took it to a mechanic). The mechanic ran a new ground to the injector from the ECM and all is good.

On the 2.5L the injector harness runs around the back of the valve cover to the ECM. There is a threaded post sticking straight up for something. After years and years the harness falls onto the post and slowly chafes until it breaks through. It could have grounded any wire in the harness, but I got the lucky one! He pulled the harness on top of the valve cover and zip tied it to the throttle cable so it wont happen again.

If you have a code reader it a good place to start. The mechanics have a much better one and it took them a few hours at that.

Also, I replaced the TPS as recommended by several posters and it did nothing. No problem though, it was cheap and helped me prevent another problem down the road. I took off the throttle body and cleaned it thoroughly with sea foam cleaner and a toothbrush (make sure you remove all electronics before cleaning...TPS, IAC, MAP). While your at it give the IAC a good cleaning.

Hope this helps!
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