All codes › P0430

P0430 — Catalyst Efficiency Below Threshold (Bank 2)

P0430 is the Bank 2 counterpart of P0420. It is set when the engine control module compares the upstream and downstream oxygen sensor signals on Bank 2 and determines that the catalytic converter for that bank is no longer storing and releasing oxygen efficiently. P0430 only applies to V-engines and inline engines with separate exhaust banks; four-cylinder engines do not set P0430.

Pick your vehicle for a P0430 diagnosis

Select your exact year, make, and model below to get a diagnostic guide tuned to your vehicle's known failure patterns and TSBs.