P0430 Catalyst system efficiency below threshold, bank 2
- System
- Powertrain - engine and transmission
What P0430 means
"Catalyst system efficiency below threshold, bank 2" is the same two-sensor comparison as P0420 on the engine's other cylinder group. The computer compares the oxygen sensor before that bank's converter with the one after it, and files this code when the difference fell below its threshold. Only engines with two banks can report it.
This is a standard code. It means the same thing on every make of vehicle.
What the program shows for P0430
The Full scan's on-board self-tests list the catalyst result bank by bank, which is where bank 2 appears on its own line, each with the limits the car judged it against. Catalyst temp and O2 sensor (rear) are the related live readings on the Dashboard.
The Dashboard shows Commanded EGR, EGR error, Evap purge, Catalyst temp, O2 sensor (rear), Fuel level and Coolant temp. The Full scan's On-board self-tests list the Catalyst bank, EGR / VVT bank, EVAP leak, EVAP purge flow, EVAP purge valve and Secondary air results as PASS, FAIL or NO RESULT against the car's own limits, and the Inspection screen shows whether the Catalytic converter, Fuel vapour system, Exhaust gas recirculation and Secondary air injection monitors are done or still running. Clear codes warns that clearing resets those monitors.
See how the program shows a code →