P0433 Code: Heated Catalyst Efficiency Below Threshold (Bank 2)
🟠 Moderate severity · drivable
Drivable, but the heated converter isn't cleaning exhaust efficiently and may need replacing.
What P0433 means
The heated catalytic converter on bank 2 is not cleaning exhaust efficiently. Heated converters use an electric heater to warm up quickly, so a failed heater or a worn-out catalyst can trigger this code.
Symptoms
- Check engine light is on
- Reduced fuel economy
- Possible failed emissions test
- Often no noticeable driving symptoms
Common causes
- most common: Failed heater element inside the converter
- common: Worn or clogged catalytic converter
- common: Faulty wiring or blown fuse in the heater circuit
- less common: Faulty oxygen sensor
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Check the heater circuit fuse and wiring and repair as needed | Yes | $20–100 |
| Test and replace faulty oxygen sensors | Yes | $60–200 |
| Replace the heated catalytic converter | Mechanic | $700–2500 |
Frequently asked questions
Can I drive with a P0433 code?
Yes, but the heated converter isn't cleaning exhaust efficiently. Get it diagnosed before your next emissions test.
What causes P0433?
A failed heater element in the converter is the most common cause, but a worn-out catalyst, bad wiring, or a bad oxygen sensor can also trigger it.
How much does it cost to fix P0433?
$20–100 for wiring or fuse repairs, or $700–2500 for a new heated catalytic converter.
Related codes
P0434
P0434 Code: Heated Catalyst Temperature Below Threshold (Bank 2)
P0431P0431 Code: Catalyst 1 Efficiency Below Threshold (Bank 2)
P0420P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1)
Related guide: How to Reset a Check Engine Light →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.