Code status
Needs verification
Not yet verified against SAE J2012_202509 / J2012DA. Treat unverified rows as a lookup aid, not repair authority.
- System
- Emissions
- 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 replace the catalyst without checking sensor data and upstream engine problems that can cause or mimic poor warm-up efficiency.
Useful checks before replacing parts
- Check exhaust leaks, upstream and downstream sensor behavior, coolant temperature data, and warm-up monitor conditions.
- Review misfire history, rich or lean operation, oil consumption, and coolant contamination that can damage the catalyst.
- Confirm the catalyst monitor has run under valid warm-up conditions after any repair.
Related OBD-II codes
These nearby emissions entries can help compare wording and fault area. They may share the same verification status as the source database.