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Possible Causes

Possible Causes 
INTERMITTENT DTC
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K904) O2 RETURN (DOWN) CIRCUIT SHORTED TO VOLTAGE
(K243) O2 2/2 SIGNAL CIRCUIT SHORTED TO THE (K399) O2 2/2 HEATER CONTROL CIRCUIT
(K243) O2 2/2 SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
(K904) O2 RETURN (DOWN) CIRCUIT OPEN OR HIGH RESISTANCE
2/2 O2 SENSOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding.

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