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DTC codes / P04xx · Auxiliary emission controls / P0433
P0433 means the powertrain control module (PCM) has determined that the bank 2 heated catalytic converter is not cleaning the exhaust as efficiently as it should, based on oxygen sensor readings before and after the converter. The PCM compares the switching activity of the downstream oxygen sensor to the upstream sensor and sets this code when the catalyst's oxygen-storage capacity falls below the expected threshold.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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