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Possible Causes

POSSIBLE CAUSES
HIGH RESISTANCE IN THE (K299) O2 SENSOR 1/2 HEATER CONTROL CIRCUIT
HIGH RESISTANCE IN THE (Z904) GROUND CIRCUIT
OXYGEN SENSOR 1/2
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . . 

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