P0430 on a Ford: 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 Ford

On a Ford, P0430 means the rear oxygen sensor on bank 2 says the catalytic converter isn't cleaning exhaust efficiently. It's the bank 2 version of P0420 and shows up most on V6 and V8 Fords.

Is P0430 common on Fords?

Ford trucks and SUVs with V6 or V8 engines, like the F-150 and Explorer, see P0430 at higher mileage as converters and oxygen sensors wear. Checking for exhaust leaks first can save owners from buying a converter they don't need.

Commonly reported on: F-150, Explorer, Mustang, Expedition.

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