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  #1  
Old 01-04-2015, 07:41 PM
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P0138

Hey everyone I am looking for some clarification on code P0138 on my daughter's 2004 Liberty. My scanner says O2 (B1 S2) Sensor Voltage High Condition. I am guessing this means Bank 1 Sensor 2. Is this the post cat O2 sensor on Bank 1? Which side of the engine is considered Bank 1?

Thanks in advance for everyone's help.

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  #2  
Old 01-05-2015, 06:13 AM
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Re: P0138

The 1-2 sensor is indeed the after cat sensor on bank 1. Bank 1 is the one which has cylinder #1, which is the left bank as seen from the drivers seat for Chrysler products.
The P0138 code itself could mean a short in the wiring to the sensor, sending a voltage of more then 0.999 V for a prolonged time to the PCM. Check the O2 sensor wiring first for any shaving or melted wire isolation due to contact with hot exhaust parts. If the wiring seems to be ok, then most probably the O2 sensor is bad.
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  #3  
Old 01-05-2015, 07:01 AM
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Re: P0138

Thanks for the clarification Frango100. I guess I'll pull it in the garage tonight after work and check for damaged wires.
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Old 01-05-2015, 09:03 AM
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Re: P0138

Yes, thats the first thing to do. Take care to not burn your hands/arms to any hot exhaust or engine part. Best is to let it cool down first to prevent any burns.
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Old 01-05-2015, 01:22 PM
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Re: P0138

Thanks for the advice. It should not get too hot since I just have to move it from the driveway into the garage. Hopefully it is not as hard to get to as the pre-cat O2 sensor I replaced on my 2000 Durango. I could barely get my hand and a wrench in there to replace it.
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