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Home >> Jeep >> 2006 >> Commander Base, 3.7 K, AWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> 3.7L & 4.7L & 5.7L Engine - DTCS P0121 To P0171 >> Diagnosis And Testing >> P0138-O2 Sensor 1/2 Circuit High >> Possible Causes

Possible Causes

Possible Causes 
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
(K904) O2 RETURN DOWNSTREAM CIRCUIT SHORTED TO BATTERY VOLTAGE
(K141) O2 1/2 SENSOR SIGNAL CIRCUIT OPEN
(K904) O2 RETURN DOWNSTREAM CIRCUIT OPEN
O2 SENSOR
PCM

Always perform the  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  before proceeding. 

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