What does code P0432 mean?

Q: What does code P0432 mean?

Main Catalyst Efficiency Below Threshold (Bank 2). P0432 means the powertrain control module has judged that the bank 2 catalytic converter is no longer cleaning the exhaust effectively. The computer compares the upstream and downstream oxygen sensor signals on that bank and flags the code when the downstream sensor tracks the upstream sensor too closely, indicating the converter has lost its oxygen-storage capacity.

DTC codes / P04xx · Auxiliary emission controls / P0432

P0432Main Catalyst Efficiency Below Threshold (Bank 2)

P0432 means the powertrain control module has judged that the bank 2 catalytic converter is no longer cleaning the exhaust effectively. The computer compares the upstream and downstream oxygen sensor signals on that bank and flags the code when the downstream sensor tracks the upstream sensor too closely, indicating the converter has lost its oxygen-storage capacity.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaAuxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.