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Had the same intermittent issues a while back. One day the code stayed on but the Jeep ran fine. Replaced everything like you did - ended up with a valve job - possible valve spring issue. The intermittent sputtering from the tailpipe was a clue. After new heads the Jeep is smooth as silk -...

My 04 KJ with 96K miles does the same thing. After getting wet from underneath (heavy rain, slushy snow mostly) I'd trip the same code. Once it dries out the code goes away and check engine light turns off until the next time. I wrapped the O2 harness in a waterproof plastic wrap and the code...

Is there anyway just to replace the rubber boot on the front driveshaft where it goes into the transfer case? If so, where can I find the boot. Thanks.

Did you drive thru heavy rain recently. Every time it rains hard (or snows in the winter) and the undercarriage gets soaked I get a P0138 code and light. After drying out it goes away after a few restarts. I think something (the harness or sensor itself) shorts out when wet and trips the...

On my 04 Renegade (fitted with stock wheels) I get the bad/missing TPMS sensor upon each start up. Tire pressures in all 5 tires are good. The EVIC displays the pressure for all 4 tires (R front, L front, R Rear, L Rear). The spare never displayed. I was able to retrain all 5 TPMS sensors...