P0144

Tests 1 - 3:

Tests 4 - 8:

Tests 9 - 12:

SYMPTOM
P0144 - 1/3 O2 SENSOR SHORTED TO VOLTAGE

WHEN MONITORED
With battery voltage greater than 10.4 volts, engine running for more than 4 minutes and coolant temperature above 180 °F.

SET CONDITION
The oxygen sensor voltage is above 1.5 volts.

POSSIBLE CAUSES
- O2 sensor heater feed circuit open
- O2 sensor heater ground circuit open
- O2 sensor sensor ground circuit open
- O2 sensor signal circuit open
- O2 sensor signal circuit shorted to voltage
- Wiring harness intermittent defect
- PCM (1/3 O2 sensor shorted to voltage)
- O2 sensor shorted to voltage