HO2S Heater Control Circuit (Bank 1, Sensor 1)

Where it lives

For P0030, the sensor sits on the circuit this code reports. The description of P0030 puts it on bank 1.

Check these first

• Blown O2 sensor heater fuse
• Open or shorted heater wiring
• Failed oxygen sensor heating element
• Faulty PCM heater driver

What to do next

1. Check the O2 sensor heater fuse and relay
2. Measure heater circuit resistance at the sensor connector
3. Verify heater power and ground with the ignition on
4. Replace the oxygen sensor if the heater element tests open
5. Repair wiring and clear the code

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