P0430 on a Volkswagen: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

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

What P0430 means on a Volkswagen

On a Volkswagen, P0430 means the bank 2 catalytic converter isn't cleaning exhaust to the level the computer expects. It mainly shows up on V6 VWs such as the Atlas and Touareg, since four-cylinder models have only one bank.

Is P0430 common on Volkswagens?

P0430 is less common on VW than P0420 because most VWs sold are four-cylinder models with a single bank. On V6 models, worn converters and oxygen sensors at higher mileage are the usual story.

Commonly reported on: Atlas, Touareg, Passat.

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	$800–2800