P0138 - O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor2)
The Heated Oxygen Sensor (2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)
Symptoms: There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.
Causes: A code P0138 may mean that one or more of the following has happened:
* Faulty O2 sensor
* Short to battery voltage in O2 sensor signal circuit
* High fuel pressure (not as likely)
Possible Solutions: Here are some potential solutions:
* Replace O2 sensor
* Repair short to battery voltage in o2 sensor signal circuit
Hope helps (remember to rate and comment this).
P0138 is 02 sensor cuircut high volts ( bank 1 sensor 2 ). 02 sensor in back of convertor is reading higher then the front one it is less active than the front one. bank 1 is the bank the #1 cylinder is at. so this means that # 2 sensor is behind convertor. have a good day!!
Http://www.cherokeeforum.com/f2/check-engine-p0138-29935/
hope this info helps
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