Error code

OBD2 P0144

OBD2P0144
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

O2 Sensor Circuit High Voltage.

Severity

moderateCan drive, but the issue should be addressed soon as it affects emissions.

Summary

P0144 indicates high voltage in the heated oxygen sensor circuit for Bank 1 Sensor 3, which is located downstream of the catalytic converter.

Common Causes

  • Faulty heated oxygen sensor (HO2S)
  • Wiring short to positive
  • Physical damage or corrosion in wire harnesses and connectors

Diagnosis

  1. Check fuses and wiring for any obvious damage or corrosion.
  2. Inspect the oxygen sensors for physical damage.
  3. Verify continuity in the sensor circuit using a multimeter.
  4. Perform exhaust leak checks between the catalytic converter and HO2S.

Fixes

  • Replace faulty heated oxygen sensor (HO2S).

FAQ

What does P0144 mean?

P0144 indicates high voltage in the heated oxygen sensor circuit for Bank 1 Sensor 3, which is used to monitor catalytic converter efficiency.

How do I diagnose P0144?

Use a multimeter to check continuity and resistance in the HO2S circuit. Inspect wiring and connectors for damage or corrosion.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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