The Quick Answer above is the generic definition. What follows is what is documented for the Audi models that log P0432, checked against manufacturer data and owner reports.
DTC/P0432·Audi
P0432 on Audi: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Audi
P0432 on a Audi means the main catalytic converter on Bank 2 has dropped below the efficiency threshold the ECU expects. Bank 2 is the cylinder bank that does not contain cylinder 1, so P0432 only applies to V6, V8, V10, V12, or certain flat engine layouts. It is the Bank 2 equivalent of P0422.
Repair cost on Audi€125 - €1800
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Audi A6
2005-2024On the Audi A6 3.0 TFSI (EA837) and 3.0 TDI V6, P0432 typically appears at 180,000 km on the Bank 2 main cat. The Bank 2 main cat on the EA837 supercharged V6 is accessible from below without dropping the subframe, which keeps labour reasonable. On 3.0 TDI variants check for soot loading from a stuck EGR valve before condemning the cat itself.
What causes P0432 on a Audi?
Beyond the generic causes listed on the main P0432 page, these are the documented Audi-specific patterns:
Audi A6EA837 Bank 2 main cat aging around 180,000 km
Audi A6Stuck EGR valve on 3.0 TDI causing soot loading on Bank 2
How to diagnose P0432 on a Audi with OBD2
Follow these steps to pinpoint the root cause of P0432:
- Confirm the engine actually has Bank 2 (V6, V8, V10, V12, or flat layout). On inline engines P0432 indicates a wiring or scan-tool fault
- Read freeze frame data and check for companion codes (P0431, P0430, Bank 2 misfires, Bank 2 lean or rich)
- Inspect the full Bank 2 exhaust run for leaks, particularly at flange joints, slip-fit connectors, and flex pipe sections
- Graph the Bank 2 downstream O2 sensor at steady 2,000 to 2,500 RPM. A healthy main cat keeps it stable around 0.4 to 0.6 V
- Compare Bank 1 vs Bank 2 fuel trims. If Bank 2 long-term fuel trim is consistently 8 percent or more above Bank 1, the underlying mixture imbalance is degrading the Bank 2 cat
How much does P0432 cost to fix on a Audi? (EUR)
Estimated repair costs for P0432 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 P0432 on Audi
These codes commonly cluster with P0432 on Audi vehicles:
Looking for the full P0432 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0432 guideSkanyx · Audi
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