Code status
Needs verification
Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.
- System
- Fuel / Air
- Scope
- iso-sae-controlled-p0
- Standard
- SAE J2012 / ISO 15031-6
- Source
- legacy-import
Diagnostic boundary
A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.
Do not diagnose this as a fuel-mixture fault first; the named circuit is the heater control path, not the sensor's oxygen signal.
Useful checks before replacing parts
- Check heater-circuit fuse, power feed, ground or control wire, connector terminals, and exhaust heat damage near bank 1 sensor 1.
- Review whether other heater codes share the same supply or ground path.
- Use service-information resistance and current tests before replacing the sensor.
Related OBD-II codes
These nearby fuel / air entries can help compare wording and fault area. They may share the same verification status as the source database.