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 condemn the catalytic converter from this code; the first diagnostic path is the downstream sensor heater circuit.
Useful checks before replacing parts
- Inspect downstream sensor heater wiring, connector condition, exhaust heat damage, and the shared heater fuse or relay.
- Check heater power, ground, control command, and resistance with the correct service limits.
- Review catalyst or downstream sensor codes that may appear when the heater fault prevents a monitor from running correctly.
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.