The Quick Answer above is the generic definition. What follows is what is documented for the BMW models that log P0432, checked against manufacturer data and owner reports.
DTC/P0432·BMW
P0432 on BMW: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)BMW
P0432 on a BMW 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 BMW€125 - €1800
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BMW 3 Series
2007-2013P0432 on the 3 Series applies to V8 variants like the E90 and E92 M3 (S65 V8) and earlier V8 sport models. The Bank 2 main cat on the S65 sits in the underfloor section ahead of the secondary muffler and is more accessible than the manifold-integrated pre-cat. Always check Bank 2 fuel-trim history because S65 individual throttle body sync issues commonly cause Bank 2 to run slightly richer.
What causes P0432 on a BMW?
Beyond the generic causes listed on the main P0432 page, these are the documented BMW-specific patterns:
BMW 3 SeriesS65 individual throttle body sync drift causing Bank 2 enrichment
BMW 3 SeriesBank 2 main cat end-of-life around 180,000 km on stock S65
How to diagnose P0432 on a BMW 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 BMW? (EUR)
Estimated repair costs for P0432 in EUR, compiled across makes. Expect BMW 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 BMW
These codes commonly cluster with P0432 on BMW vehicles:
Looking for the full P0432 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0432 guideSkanyx · BMW
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