Error code

OBD2 P0147

OBD2P0147
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

O2 Sensor Heater Circuit.

Severity

moderateCan drive, but may fail emissions testing.

Summary

Code P0147 indicates a malfunction in the heater circuit of the downstream oxygen sensor (HO2S) on bank 1 of your engine.

Symptoms

  • Illuminated check engine light

Common Causes

  • Problem on the ground side of the O2 sensor heater circuit
  • Problem on the power side of the O2 sensor heater circuit
  • High resistance in the O2 sensor heater element
  • Open circuit in the O2 sensor heater element

Diagnosis

  1. Test the heater circuit wiring for power and ground using a digital multimeter.
  2. Check the resistance of the sensor heating element to determine if it has high resistance or an open circuit.

Fixes

  • Replace the faulty oxygen sensor if there is high resistance or an open circuit in the heater element.

FAQ

What should I do if my check engine light comes on with code P0147?

You should test the oxygen sensor's heater circuit for power and ground issues, and also check the resistance of the heating element. If there is a problem, replace the faulty oxygen sensor.

View source

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

More OBD2 codes

All OBD2 codes →Search more codes →