P0157

Tests 1 - 4:

Tests 5 - 7:

SYMPTOM
P0157-2/2 O(2) SENSOR SHORTED TO GROUND

TEST NOTE
This symptom is diagnosed using the test P0131-1/1 O(2) 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
- Intermittent Condition
- O(2) Sensor Operation
- O(2) Sensor Signal Circuit Shorted To Ground
- O(2) Sensor Signal Circuit Shorted To Sensor Ground Circuit
- O(2) Sensor Signal Shorted To Heater Ground Circuit
- PCM