The Quick Answer above is the generic definition. What follows is what is documented for the BMW models that log P0175, checked against manufacturer data and owner reports.
DTC/P0175·BMW
P0175 on BMW: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)BMW
P0175 on a BMW means the air-fuel mixture on Bank 2 is too rich and the ECU cannot remove enough fuel to bring it back to the 14.7:1 stoichiometric target. Because the code is bank-specific, the cause is usually something local to Bank 2 (a leaking injector on that side, a degraded sensor, or fuel pressure imbalances) rather than a whole-engine issue.
Repair cost on BMW€120 - €600
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Get Skanyx freeWhat does P0175 mean on a BMW?
BMW 3 Series
2006-2015P0175 is a bank 2 code, so on a 3 Series it means the V8 M3 with the S65, and it comes most often from a single leaking injector on that bank. BMW recommends replacing injectors as a set because the rich-running side is often the first symptom of broader wear. On the inline-six N52, N54 and N55 the code does not apply, because they have a single bank.
What causes P0175 on a BMW?
Beyond the generic causes listed on the main P0175 page, these are the documented BMW-specific patterns:
BMW 3 SeriesLeaking bank 2 injector on the S65 V8
BMW 3 SeriesAged bank 2 upstream lambda sensor on the S65 V8
How to diagnose P0175 on a BMW with OBD2
Follow these steps to pinpoint the root cause of P0175:
- Read live data: confirm Bank 2 long-term fuel trim is negative beyond -20% while Bank 1 stays within normal range
- Pull Bank 2 spark plugs and inspect for black sooty deposits. Compare to Bank 1 plugs; a clear visual difference confirms the bank-specific richness
- Swap the upstream lambda sensors between Bank 1 and Bank 2. If the rich condition follows the sensor, replace it
- Measure fuel pressure with a gauge and compare to spec at idle and under load. High pressure can over-fuel both banks but sometimes shows up more on the bank with already weak injectors
- Perform an injector balance test or have injectors flow-tested off the engine. A single leaking injector on Bank 2 explains the code on a V6 or V8
How much does P0175 cost to fix on a BMW? (EUR)
Estimated repair costs for P0175 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 P0175 on BMW
These codes commonly cluster with P0175 on BMW vehicles:
Looking for the full P0175 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0175 guideSkanyx · BMW
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