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fritothebandito 08-25-2012 01:50 PM

2002 grand cherokee p0155 error code
I am receiving the p0155 error code and according to the mpoar shop manuel it says 2/1 o2 sensor heater failure and then oxygen sensor heater element malfuction. How do I know wat to replace the upstream or the down stream sensor?

fritothebandito 08-25-2012 02:11 PM

p0155 error
I have a 4.0 2002 with the error code p0155. i am going to replace one of the 02 sensors, but which one? the description of the error in the mopar shop manual is "2/1 sensor heater failure" and "oxygen sensor heater element malfunction" From the description of what they measure I would think it is the down stream, any expert advice?

Frango100 08-25-2012 03:20 PM

Re: p0155 error
Normally 2/1 means bank 2, sensor 1 (upstream sensor).
Did you check the O2 sensor fuses in the Power Distribution Center under the hood first?

fritothebandito 08-25-2012 03:24 PM

Re: p0155 error
No I have not checked the fuses, but I will. Is this a visual inspection or do i need to put a volt meter on it? At 183,000 i assumed it would the O2 sensor

fritothebandito 08-25-2012 03:46 PM

Re: p0155 error
I checked both fuses, good to go. I am going to try the upstram sensor.

Frango100 08-25-2012 05:22 PM

Re: p0155 error
There can also be a relay in the O2 heater circuit.
You have now at 3 different places questions about this same O2 sensor problem. I think its better to keep it centralised at one place.

hoffmanestates 08-26-2012 04:27 PM

Do both as they are cheap.

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01grand 08-27-2012 10:15 AM

Re: 2002 grand cherokee p0155 error code
Sensor 2/1 means bank 2 (right side of engine) sensor 1 (upstream). Go to a dealer or find Denso brand sensors, other brands like bosch don't heat up fast enough for the jeep computer.

hoffmanestates 08-27-2012 11:23 AM

Napa has them for like 45-50

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