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Possible Causes

Possible Causes 
INTERMITTENT DTC
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K904) O2 RETURN (DOWN) CIRCUIT SHORTED TO VOLTAGE
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO THE (K299) O2 1/2 HEATER CONTROL CIRCUIT
(K141) O2 1/2 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
(K904) O2 RETURN (DOWN) CIRCUIT OPEN OR HIGH RESISTANCE
1/2 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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