p0430
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Audi · SUVs
Catalyst System Efficiency Below Threshold (Bank 2)
Quick Answer
Error code P0430 on your Audi SUVs means: Catalyst System Efficiency Below Threshold (Bank 2). This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Verify bank 2 fuel trims are within normal range to rule out a rich condition
2
Compare upstream and downstream O2 sensor signals on bank 2
3
Check for exhaust leaks around the bank 2 catalytic converter and downpipe
4
Inspect the catalytic converter with a thermal camera or temperature probe for uneven heating
5
Replace the bank 2 catalytic converter if confirmed failed
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Catalytic converter (bank 2)
Downstream O2 sensor (bank 2)
Exhaust gaskets
Exhaust clamps
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