P0432
PowertrainCatalystmoderate severityMain Catalyst Efficiency Below Threshold (Bank 2)
What P0432 Means
The catalytic converter on bank 2 is not cleaning the exhaust as well as it should. This usually means the catalyst has degraded over time or an upstream problem is affecting it.
Symptoms
- Check engine light on
- Failed emissions test
- Slight loss of fuel economy
Common Causes
- Worn or failed catalytic converter (bank 2)
- Faulty downstream oxygen sensor
- Exhaust leak near sensors
- Engine misfire or rich/lean condition
Diagnostic Steps
- Scan for other codes first (misfire, fuel trim)
- Check for exhaust leaks around sensors
- Compare upstream and downstream O2 sensor readings
- Replace catalytic converter if sensors are good
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