Engine code - JeepForum.com
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post #1 of 2 Old 10-10-2009, 07:22 PM Thread Starter
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2004 WJ 
Join Date: Jan 2009
Location: Albany, NY
Posts: 76
Engine code

Have a 2004 WJ, 4.0L, 95k

I'm getting a check engine light, P0031 HO2S Heater Circuit Low Voltage Bank 1 Sensor 1.

The jeep is nearing 100k, so I replaced all four of them. Next day, I get the same code. Didn't have a chance to replace right away, it's been about a month. Check engine light comes on and off. Will be off for a couple of days, then on for a couple of days.

Today, clear the code, replace the O2, which I'm pretty sure is 1/1, let the Jeep idle for about 10 minutes, no light. Back out of my driveway, engine light comes back on, same code.

Any ideas of what I might check next? Looked quick for frayed wires, but didn't see anything.

This is driving me nuts!

Uncle_Fester is offline  
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post #2 of 2 Old 10-11-2009, 07:19 PM Thread Starter
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2004 WJ 
Join Date: Jan 2009
Location: Albany, NY
Posts: 76
Anyone, anything?
Uncle_Fester is offline  

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