Bob's Mechanical Repairs

BMW P0507

Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].

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Idle speed higher than expected on BMW — vacuum leak from CCV/PCV cracked hoses or DISA flap on N42/N46 and N55.

BMW P0507 — Idle speed higher than expected on BMW — vacuum leak from CCV/PCV cracked hoses or DISA flap on N42/N46 and N55. Typical UK independent garage cost: £90–£320.

What actually causes P0507 on a BMW

BMW P0507 is overwhelmingly a vacuum leak — cracked CCV (crankcase vent) diaphragm on N42/N46/N52, split bellow on N55, or the DISA intake-flap O-rings. Easy to find with a smoke test, easy to fix.

BMW engines that log P0507

  • N42/N46 2.0 (E46/E90)
  • N52/N53 inline-6
  • N55 3.0 TwinPower

How we diagnose P0507 on a BMW

  1. Smoke-test intake from throttle to rocker cover
  2. Listen at the oil filler cap — strong suction = CCV diaphragm failed
  3. Inspect DISA flap for play and worn O-rings
  4. Replace CCV (cold-climate kit on N52 if applicable)

The common misdiagnosis to avoid

Don't replace the throttle body — BMW electronic throttles rarely fail. Smoke-test the vacuum system first; the CCV is the usual suspect.

BMW P0507 repair cost in the UK

Expect £90–£320 including parts and labour at an independent garage. Main-dealer quotes on BMW are usually higher for the same job, and the spread exists because the cheap cause and the expensive cause throw the same code — pay for the diagnosis before you pay for parts.

Bob's workshop tip

N52 P0507 with whistling from the engine bay = CCV. Order the cold-climate kit if the car lives in Scotland.

Codes usually seen alongside P0507 on BMW

  • P0171
  • P0174
  • P1004

Symptoms drivers report with P0507

  • The car feels like it's 'creeping' forward too fast at traffic lights without touching the gas.
  • Engine revs stay hung up at 1200rpm when you dip the clutch approaching an intersection.
  • A noticeable 'hissing' or whistling noise from the engine bay when idling on the driveway.
  • The stop-start system has stopped working because the idle isn't stable enough for the ECU.
  • Surging or 'hunting' revs when you first start it from cold in the morning.

Repairs that clear P0507

  • Smoke-test intake
  • Clean throttle body
  • Replace PCV valve / rocker cover
  • Inspect all vacuum hoses

For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P0507 guide.

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