Check Engine P0138
#1
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Year: 1999
Model: Cherokee
Engine: 4.0L
Check Engine P0138
So I pulled my codes and I got a P0138, the book says "02 sensor circuit high voltage (bank 1 sensor 2)".
I cleared the code and will have to drive to see if it comes back.
Any thoughts on the cause?
I cleared the code and will have to drive to see if it comes back.
Any thoughts on the cause?
#3
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Year: 1999
Model: Cherokee
Engine: 4.0L
#4
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Year: 1998
Model: Cherokee
Engine: 4.0 HO
That's the downstream O2 sensor, it should be just after the catalytic converter.
Go find it and make sure that it looks OK and that the wires are OK.
Mine threw this code and another ( I forget what ) when I managed to break the O2 sensor.
Go find it and make sure that it looks OK and that the wires are OK.
Mine threw this code and another ( I forget what ) when I managed to break the O2 sensor.
#7
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#8
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Year: 1999
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20 miles or so later the code came back. I guess I need to order a new sensor.
Any tips on changing it? Open end (size?) wrench best?
Any tips on changing it? Open end (size?) wrench best?
#10
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Year: 1989
Model: Cherokee (XJ)
Engine: 4.7 H.O.
7/8" closed end of the wrench, unplug the sensor and work the wire through til it's not in the way. If you use the open end, your gonna slip and rake your knuckles or round the bolt. Best bet to break it loose is to warm the car up first (expands the exhaust) and expect to use some severe force to break it loose. Not sure where the PB recommendation is coming from since your not gonna be able to get any of the threads with it and it's there fore useless on this part (excellent when you can hit the threads). I get the wrench on there good and push with my foot to break them loose. They also make a specific socket for 02 sensors, but that's a waste of money.
#11
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Year: 2000
Model: Cherokee
Engine: 4.0 L
had the same exact problem (p0138) code pop up. replaced both o2 sensors, they were ready to be replaced anyways. code came back (p0138) high voltage. come to find out it was a missed fuse in the fuse block next to the batery in the engine compartment. changed the fuse, cleared the code. have drove over a 1000 miles and no problems.
#12
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Year: 1997
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Before you do anything!! Check the fuse(15 amp) under the hood, it blows and comes up with this code. Went through hell with this!!
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