P0430 on a Toyota: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

Drivable in the short term, but the bank 2 converter problem should be checked soon to avoid worse issues.

What P0430 means on a Toyota

On a Toyota, P0430 means the rear oxygen sensor on bank 2 reports the catalytic converter isn't cleaning exhaust as well as it should. It's the bank 2 version of P0420, which is one of the most common codes on Toyota V6 models.

Is P0430 common on Toyotas?

High-mileage Toyota V6 models like the Camry, Highlander, and Tacoma see P0430 as converters and oxygen sensors wear with age. Because Toyotas tend to last a long time, this code often shows up on older, well-maintained vehicles.

Commonly reported on: Camry, Highlander, Avalon, Tacoma.

Symptoms

Check engine light is on
Reduced fuel economy
Possible rotten-egg smell from the exhaust
Often no noticeable driving symptoms early on

Common causes

most common: Worn or failing catalytic converter on bank 2
common: Faulty downstream oxygen sensor on bank 2
common: Exhaust leak before or near the downstream sensor
less common: Unfixed misfire or rich fuel mixture that damaged the converter

How to fix it

Fix	DIY?	Typical cost
Inspect for exhaust leaks and repair them before replacing anything	Yes	$50–200
Test the downstream oxygen sensor and replace it if faulty	Yes	$60–200
Replace the bank 2 catalytic converter	Mechanic	$600–2500