Diagnostic Trouble Code
P0030 — O2 Sensor Heater Circuit Bank 1
O2 Sensor Heater Circuit Bank 1
Definition
The heater circuit in the upstream oxygen sensor (Bank 1, Sensor 1) has malfunctioned. The heater element brings the O2 sensor to operating temperature quickly after a cold start, enabling the ECM to enter closed-loop fuel control sooner.
Common Causes
- Failed O2 sensor heater element
- Blown fuse in the O2 heater circuit
- Corroded or damaged wiring/connector
- Faulty ECM relay or driver circuit