O2 sensor code P0138 - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 2 Old 03-19-2017, 02:31 PM Thread Starter
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O2 sensor code P0138

I replaced my PCM. It is throwing P0138 which is a sensor high voltage on the downstream right side.


I checked ground lines for all the sensors and they are good. I have replaced all of the sensors with new bosch ones.

Is it just a garbage bosch o2 sensor and should I just replace it with an OEM one?
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post #2 of 2 Old 03-19-2017, 04:07 PM
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Checking the ground lines for all the sensors and finding them to be good verifies the ground circuits for all the sensor heaters are good.

P0138 requires troubleshooting the signal circuit and signal return circuit for the right side lower O2 sensor. (Right side as viewed from behind the engine.)

Here is where you should be looking:

Possible Causes

O2 1/2 SIGNAL CIRCUIT SHORTED TO VOLTAGE

O2 RETURN DOWNSTREAM CIRCUIT SHORTED TO VOLTAGE

O2 1/2 SENSOR SIGNAL CIRCUIT OPEN

O2 RETURN DOWNSTREAM CIRCUIT OPEN

1/2 O2 SENSOR

POWERTRAIN CONTROL MODULE (PCM)

2008 Unlimited Rubicon Automatic
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