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Possible Causes

Possible Causes 
INTERMITTENT DTC
(K99) O2 1/1 HEATER CONTROL CIRCUIT SHORTED TO GROUND
(K99) O2 1/1 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
1/1 OXYGEN SENSOR
POWERTRAIN CONTROL MODULE (PCM)

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

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