The Quick Answer above is the generic definition. What follows is what is documented for the Audi models that log P0430, checked against manufacturer data and owner reports.
DTC/P0430·Audi
P0430 on Audi: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Audi
P0430 on a Audi means the catalytic converter on Bank 2 (the engine bank that does not contain cylinder 1, found on V6, V8, and boxer engines) is no longer cleaning exhaust gases efficiently. The ECU detects this by comparing the upstream and downstream oxygen sensors: a healthy converter keeps the rear sensor steady, a worn one lets it swing. The most common cause is a worn-out converter, typically after 150,000 km, costing 400 to 1800 EUR to replace.
Repair cost on Audi€100 - €1900
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Audi A4
2005-2024Four-cylinder TFSI A4 models are single-bank and rarely see P0430. The fault is most relevant on the 3.0 and 3.2 V6 (and S4) variants, where the Bank 2 converter sits tucked against the firewall, making access labour-intensive. Audi V6 engines are also prone to oil consumption as they age, and burning oil poisons the catalyst, so check consumption before fitting a new converter.
What causes P0430 on a Audi?
Beyond the generic causes listed on the main P0430 page, these are the documented Audi-specific patterns:
Audi A4Bank 2 converter on the 3.0/3.2 V6 mounted near the firewall, increasing labour time
Audi A4Higher oil consumption on aging V6 engines contaminating the Bank 2 catalyst
How to diagnose P0430 on a Audi with OBD2
Follow these steps to pinpoint the root cause of P0430:
- Check for companion codes first (misfires, lean/rich trims, O2 heater faults). Fix those before P0430, as the catalyst code is often secondary to a misfire or fuel-mixture problem
- Graph the Bank 2 upstream and downstream O2 sensors at steady cruise (2,000 to 2,500 RPM). The upstream sensor should oscillate 0.1 to 0.9V rapidly. The downstream should stay fairly flat around 0.4 to 0.6V on a healthy converter
- If the downstream sensor mirrors the upstream oscillations, the converter is no longer storing oxygen and is likely failing
- Test the downstream O2 sensor response. If switching lean-to-rich or rich-to-lean takes over 300ms, the sensor itself is sluggish and may be the real cause rather than the converter
- Inspect the Bank 2 exhaust manifold, converter flanges, and piping for leaks. Listen for ticking or hissing on a cold start and check for soot around joints
- On high-mileage engines, check oil consumption and look for coolant loss. Burning oil or coolant contaminates the converter and will quickly kill a new one if not addressed
- Confirm you are working on the correct bank: Bank 2 is the side that does NOT contain cylinder 1. Verify cylinder 1 location in the service manual before condemning a converter
How much does P0430 cost to fix on a Audi? (EUR)
Estimated repair costs for P0430 in EUR, compiled across makes. Expect Audi parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0430 on Audi
These codes commonly cluster with P0430 on Audi vehicles:
Looking for the full P0430 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0430 guideSkanyx · Audi
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