P0432 - Main Catalyst Efficiency Below Threshold (Bank 2)

The Technical Definition: The P0432 code indicates that the catalytic converter on engine bank 2 is performing below efficiency. The car's computer monitors converter operation and efficiency with oxygen sensors.

Common Symptoms: A range of symptoms is possible with the P0432 code, including the check engine light being on, loss of power, engine stalling, engine hesitating on acceleration, and a hissing noise on acceleration.

Typical Fix: If the catalytic converter is found to be the main culprit, replacing it can help restore the efficiency of the exhaust system. It is also possible the issue is caused by a failed oxygen sensor or a leak in the exhaust system above the catalytic converter.