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P0174 on BMW — System Too Lean, Bank 2

BMW

Verified1 source
1 source
  • Official data (NHTSA)official_feed

What P0174 means

Caution — monitor closely

Bank 2 lean condition. On BMW V-engines this is often the crankcase ventilation valve or cracked intake boots on the bank-2 side.

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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.

Common causes

  • Vacuum leak (shared with bank 1)

What to check first

  1. Smoke test focused on the bank-2 side
  2. Inspect the crankcase vent valve
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