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P0340 on BMW — Camshaft Position Sensor Circuit Malfunction, Bank 1

BMW

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  • Official data (NHTSA)official_feed

What P0340 means

Avoid long trips

Same family as P0335, for the camshaft sensor — usually less critical to starting. On variable-valve-timing engines this often overlaps with timing-actuator wear.

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

Common causes

  • Failed camshaft position sensor
  • Faulty CMP sensor or its wiring
  • Timing chain stretch (EA888 early generation)

Symptoms

  • Rattling noise on cold start
  • Hard starting
  • Повышенный расход топлива
  • Hard starting or extended cranking
  • No-start condition
  • Engine stalling

What to check first

  1. Check signal with a scan tool
  2. Check VANOS solenoid operation
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