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Old 02-16-2013, 08:10 PM   #1
bumpus's Avatar
Join Date: Aug 2012
Location: CR, IA
Posts: 48
Question P0137 p0138

My Jeep turned on the check engine light this afternoon. Codes show P0137 and P0138 which are O2 sensor low voltage bank 1 sensor 2 and O2 sensor and O2 sensor high voltage bank 1 sensor 2 respectively.

I'm guessing this actually means that I have a shorted out O2 heater since the P0137 indicates test failed for short while off and P0138 indicates failure at high voltage while running. I looked under the Jeep today and didn't see any obviously damaged wires leading to the sensors, so I reset the codes. If the codes come back I'll look at replacing the faulty sensor without any more diagnostic since they're only $25 or so each.

Question I have is which one is which? I know that the sensor 1 is upstream and sensor 2 is downstream. I'm not sure about how bank 1 and bank 2 map to port and starboard. I'm guessing that bank 1 is on the passenger (starbord) side of the jeep since that's the side cylinder 1 is on the 3.8. Can anyone confirm this assumption?


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Old 02-23-2013, 09:20 AM   #2
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Join Date: Aug 2012
Location: CR, IA
Posts: 48
I got the creeper under my Jeep today and confirmed that bank #1 is on the passenger side portion of the exhaust. I unplugged the sensor, started up the Jeep and got code P0036 (Heated O2 Sensor Heater control circuit bank 1 sensor 2) right away so that confirms I was looking at the right part. I put some liquid wrench on the threads of the sensor so that I'll be able to get it loose after I pick a new one up at the parts store sometime this week.
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