P0143

Tests 1 - 4:

Tests 5 - 7:

SYMPTOM
P0143-1/3 O2 SENSOR SHORTED TO GROUND

TEST NOTE
This symptom is diagnosed using the test P0131-1/1 02 SENSOR SHORTED TO GROUND.

WHEN MONITORED
At a cold start, engine coolant below 98 °F, ambient/battery sensor reading within 27 °F, and engine coolant temperature above 170 °F on the previous key OFF.

SET CONDITION
The oxygen sensor signal voltage is below 0.156 volts for 28 seconds after starting engine.

POSSIBLE CAUSES
- Intermittent condition
- O2 sensor operation
- O2 sensor signal circuit shorted to ground
- O2 sensor signal circuit shorted to sensor ground circuit
- O2 sensor signal shorted heater ground circuit
- PCM