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Home >> Jeep >> 2007 >> Liberty Limited, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0157 To P0315 - Gas >> P0161-O2 Sensor 2/2 Heater Performance >> Possible Causes
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Possible Causes

Possible Causes 
(K399) O2 2/2 HEATER CONTROL CIRCUIT OPEN
(Z42) O2 2/2 HEATER GROUND CIRCUIT OPEN
O2 SENSOR
PCM

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

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