96 XJ, 4.0L, AW4, NP231, 4.5 inch lift. I recently replaced my entire exhaust system including convertor, muffler, tailpipe and rear O2 sensor. It had been giving me a "Convertor Efficiency below threshold" OBDII code. The new exhaust system fixed that. BTW, the O2 sensor is a dealer part, not an aftermarket. The other parts were aftermarket, and the muffler is a Magnaflow (if that makes a difference). We spent yesterday doing some serious wheeling including rocks, sand, and mud. At the end of the day I had another Check Engine Light, and this time the code said that "O2 Sensor no. 2 Voltage High". What does that mean. Did the sensor fail? or could I have broken a wire or filled the connector with mud?
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O2 Sensor Question
- Thread starter apsdad
- Start date
- Location
- MilkyWay Galaxy
apsdad said:
Sounds like the O2 sensor 12 volt heater wire is shorting to the O2 signal output wire. You need to get under there and clean it out and see if it is just wet, conductive mud in the connectors or physical damage to the wires, or both.
