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Unread 01-03-2011, 11:15 AM   #1
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1999 WJ 
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Wj 1999 WJ 4.0 Problem - O2 sensor

About 6 months ago half the time I would start up my Jeep it would start to shake and have trouble getting out of first gear. After initially getting into second there would be no problems, they would only occur during startup. I decided to have my tranny checked out and flushed and there was no issues there. After a while the check engine light came on with codes P0152, P01611, and P0141 all pointing to o2 sensor problems. I had all of them replaced and the problem went away.

Now, 6 months later the problem seems to be coming back. Check engine light just came on with code P0141. I wanted to see if someone could provide some knowledge of what could be causing the trouble. Read in other forums that it could be the governor pressure sensor/solenoid. Any help would be great.

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Unread 01-03-2011, 12:33 PM   #2
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That code points to a heater malfunction in the bank 1, sensor 2 sensor. What brand of sensor is this? It may still be under warranty.
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Unread 01-03-2011, 01:39 PM   #3
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Some posts by 4.0 owners mentioned having O2 sensor problems due to a portion of the wiring harness that contacts a bolt at the rear of the engine which wears away insulation on the O2 sensor wires. I can't say exactly where to look, but it would probably be worth while to try checking that out to see if that could be your problem.
2001 WJ Limited with Quadra-Drive, Kenne Bell Supercharger, 3-inch Kolak exhaust, Stillen rotors (F/R) and MM pads, Addco sway bars (F/R).
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Unread 01-03-2011, 01:48 PM   #4
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Thanks for the replies. I will try to find out exactly which sensors were replaced and what brand they were replaced with.

Does the shifting problem seem like it would be related to the sensors?
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Unread 01-03-2011, 06:13 PM   #5
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I cannot emphasize enough the importance of using ONLY Mopar sensors on the WJ. Not just 02 sensors, all sensors. For some reason this truck is very finicky when it comes to sensors and I have encountered numerous problems with after market sensors of all kinds. Of course Mopar are more expensive, but in the long run you will save money because eventually you will buy them anyway.
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