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Fault code P0430 means catalytic converter efficiency below threshold (bank 2). Same meaning as P0420 but referring to the second bank on V engines.

Typical symptoms

• Engine light on
• Slightly rising consumption
• No obvious driving symptoms

Most common causes

• Worn-out catalytic converter on the second bank
• Faulty bank 2 rear lambda sensor
• Exhaust leaks on that bank
• Mixture imbalance between the two banks

How it is checked in diagnosis

• Comparing the two banks: if only one is out of specification the field narrows immediately
• Checking the upstream and downstream sensor signals
• Checking the fuel corrections per bank

Can you drive with code P0430?

Yes, but it is grounds for failing the MOT.

How MasterTuning helps

We read the real values from the ECU, not just the code: that is the difference between identifying the component responsible and replacing parts by trial and error. After the repair we clear the fault and check that it does not come back. Centres throughout Italy.

Read more: vehicle database · find an installer · what is ECU remapping

Do you have code P0430 on your car? Book a diagnosis at your nearest MasterTuning centre.

Frequently asked questions

What does fault code P0430 mean?

Code P0430 means catalytic converter efficiency below threshold (bank 2). Same meaning as P0420 but referring to the second bank on V engines.

Can you drive with fault P0430?

Yes, but it is grounds for failing the MOT.

Is clearing code P0430 enough to fix it?

No: if the cause is still present the code comes back after a few kilometres. Clearing should only be done after the repair, with the diagnostic tool.

How much does it cost to fix code P0430?

It depends on the component responsible: the diagnosis is precisely what identifies it with real measurements, avoiding unnecessary replacements that cost far more than the correct repair.