Lost_Wrench
NAXJA Forum User
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Last winter my 98 XJ was giving code P0171 so I replaced the downstream O2 sensor and in doing so I discovered that the wires to the sensor had been mangled by the driveshaft, and somehow the wire plug/harness itself was also badly damaged so I had to cut it off and splice the wires directly without the harnesses. I took careful note of which wire was which to splice the correct wires together, and used crimp connectors. It took care of the P0171 code, but exchanged it for P0137 indicating incorrect voltage or a short to ground coming from that sensor. I have rewired it twice now thinking one of my connections is bad, and I can sometimes go several hundred miles and several hundred start up cycles before it comes back, but it always does, usually after a day or two of driving. I have no driveability issues and my gas mileage is still the typical 15-19 mpg.
I suppose my next step is to find a new or used harness and splice it back in with a new 02 sensor? Or could I be missing something somewhere else?
I suppose my next step is to find a new or used harness and splice it back in with a new 02 sensor? Or could I be missing something somewhere else?