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P0430 on BMW — Catalyst Efficiency Below Threshold, Bank 2

BMW

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1 source
  • Official data (NHTSA)official_feed

What P0430 means

Caution — monitor closely

Bank 2 catalyst is below its efficiency threshold — on V-engine BMWs this often shows up alongside P0420 (bank 1) and typically means catalyst aging or downstream O2 sensor degradation.

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

Common causes

  • Natural catalyst wear (bank 2)

What to check first

  1. Scan-tool catalyst efficiency test
  2. Check upstream/downstream O2 sensors
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