P0432 Code: Catalyst 2 Efficiency Below Threshold (Bank 2)
🟠 Moderate severity · drivable
Drivable, but the second converter on bank 2 isn't working efficiently and may need replacing.
What P0432 means
The second catalytic converter on bank 2 (usually the one further downstream) is not cleaning exhaust efficiently. It's less common than the first converter failing, but the causes are similar.
Symptoms
- Check engine light is on
- Reduced fuel economy
- Possible failed emissions test
- Often no noticeable driving symptoms
Common causes
- most common: Failing second catalytic converter
- common: Faulty oxygen sensor
- common: Exhaust leak near the downstream converter
- less common: Converter damaged by oil or coolant contamination
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Test the oxygen sensors and replace any that are faulty | Yes | $60–200 |
| Repair exhaust leaks | Mechanic | $50–200 |
| Replace the catalytic converter | Mechanic | $600–2000 |
Frequently asked questions
Can I drive with a P0432 code?
Yes, the car should drive normally, but the second converter isn't cleaning exhaust well. Get it checked soon.
What does P0432 mean?
The second catalytic converter on bank 2 is cleaning exhaust below the efficiency level the computer expects.
How much does it cost to fix P0432?
$60–200 for an oxygen sensor, or $600–2000 for a new catalytic converter plus labor.
Related codes
P0431
P0431 Code: Catalyst 1 Efficiency Below Threshold (Bank 2)
P0430P0430 Code: Catalyst System Efficiency Below Threshold (Bank 2)
P0420P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1)
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.