Early Production (SBEC)

Test 1 - 4:

Test 5 - 6:

SYMPTOM
P0137-1/2 O2 SENSOR SHORTED TO GROUND

TEST NOTE
This symptom is diagnosed using the test P0131-1/1 O2 SENSOR SHORTED TO GROUND.

WHEN MONITORED
At a cold start, engine coolant below 36° C (98° F), ambient/battery sensor reading within 6.6° C (20° F), and engine coolant temperature above 71° C (160° F) on the previous key off.

SET CONDITION
The oxygen sensor signal voltage is below 0.059 volts for 3 seconds after starting engine.

POSSIBLE CAUSES
- O2 sensor below 0.08 volts
- O2 sensor operation
- O2 sensor signal circuit shorted to ground
- O2 sensor signal circuit shorted to sensor ground circuit
- O2 sensor signal shorted to heater ground circuit
- PCM