P0147 1/3 O2S Heater Failure

SYMPTOM
P-0147 1/3 O2S HEATER FAILURE

WHEN MONITORED
See DRB III. With the engine at idle immediately after a cold start (engine < 147 degrees F and battery temp ±27 degrees F of engine temperature).

SET CONDITION
See DRB III. O2 sensor voltage > 3V for 30 to 90 seconds.

POSSIBLE CAUSES
- O2 sensor 1/3 related trouble codes present
- ASD relay output circuit open
- O2 sensor 1/3 connector/harness observably def
- O2 sensor 113 def (heater resistance out range)
- O2 sensor 1/3 defective (heater test failure)
- O2 sensor 1/3 ground circuit open