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Possible Causes

Possible Causes 
(K43) O2 2/1 SIGNAL CIRCUIT FOR A SHORT TO GROUND
(K902) O2 RETURN (UPSTREAM) CIRCUIT FOR A SHORT TO GROUND
(K43) O2 2/1 SIGNAL CIRCUIT FOR A SHORT TO THE (K902) O2 RETURN (UPSTREAM) CIRCUIT
2/1 OXYGEN SENSOR
POWERTRAIN CONTROL MODULE (PCM)

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