DTC code
P0430
Catalyst System Efficiency Below Threshold (Bank 2)
Technical guide
Symptoms
- Check engine light
- failed emissions bank 2
Probable causes
- Catalyst efficiency below threshold bank 2
- same causes as P0420 on bank 2
Diagnostic steps
- Same diagnostics as P0420 but bank 2 side.
- Check bank 2 downstream O2 sensor.
- Replace bank 2 catalyst if needed.
Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.
Models most reported with this code (NHTSA)
Honda Pilot 37Ford F-150 10
Count of distinct owner complaints mentioning the code. US data — same engines, same failures.
AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.
0 confirmed cases on P0430
Nothing confirmed yet for this code. No guess is offered on purpose.
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