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I have 1999 jeep cherokee lerado the chick engine light keeps coming on i get a code of po138.I have changed both 02 sensors and the cat.converter.dont know what to do

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P0138 O2Sensor Circuit High Voltage (Bank #1 Sensor #2)

OK, usually if the sensor is not responding or has slow response, then it's the O2 sensor.

What does the O2 sensor that you took out look like? Plugged? Contaminated with a glaze of some sort?

Also, I would take it to an auto electrical shop that can see if the wiring to the O2 sensor is bad (not continuous).

Hope this helps..

Posted on Jul 11, 2010


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