1996 XJ Code PO141

My check engine light came on Friday morning for the first time ever. I guess I should be thankful, as it now has 174K on the odometer. LOL!

Anyway, Autozone pulled the code, which was PO141, indicating the downstream O2 sensor. All of my underhood fuses are good, and a quick trace of the wires from the O2 sensor shows no damaged wires. I replaced the sensor, and unhooked the negative battery cable for about 30 seconds to clear the code.

The check engine light is still on. Did the sensor not correct the problem, or do I still need to clear the old code somehow?

I unhooked the negative cable again -- for 15 minutes this time -- and the check engine light went off.

On OBD2 you need to clear the code with the scan tool. Unhooking the battery may work but OBD2 has the memory of an elephant.

This should work for any OBDII Jeep.

http://www.quadratec.com/jeep_knowle...article-89.htm

For just clearing codes, I use a Scangauge, although just about any OBDII device can do that too. You might also request that your local parts store guy look the other way while you press the "clear" button on the store's reader.