Bob's Mechanical Repairs

Volkswagen P0340

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

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Camshaft position sensor on VAG — Hall sensor failure on 1.4/1.6 FSI and 2.0 TDI common rail.

Volkswagen P0340 — Camshaft position sensor on VAG — Hall sensor failure on 1.4/1.6 FSI and 2.0 TDI common rail. Typical UK independent garage cost: £65–£280.

What actually causes P0340 on a Volkswagen

VAG cam sensors (Hall-effect type) suffer heat-related failure around 80-120k. On 2.0 TDI CR engines the sensor is at the back of the head and is a fiddly job. Rough cold-start and long crank are typical accompanying symptoms.

Volkswagen engines that log P0340

  • 1.4 TSI EA111/EA211
  • 1.6 FSI BLF/BAG
  • 2.0 TDI CR (CFFB/CBAB/CFGB)
  • 1.9 TDI PD (BKC/BXE)

How we diagnose P0340 on a Volkswagen

  1. Scan for P0341 alongside (correlation vs hard fault)
  2. Inspect harness routing for chafe
  3. Test sensor signal with oscilloscope or live data
  4. Use OEM/VAG sensor — pattern parts have failed quickly in our bay

The common misdiagnosis to avoid

Don't replace the sensor without checking the harness — chafed wiring against the cam cover bolt is a known cause that returns within weeks.

Volkswagen P0340 repair cost in the UK

Expect £65–£280 including parts and labour at an independent garage. Main-dealer quotes on Volkswagen 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

VAG 2.0 TDI CR — order the cam sensor on the same job as a fuel filter and you'll be in and out in 90 minutes.

Codes usually seen alongside P0340 on Volkswagen

  • P0341
  • P0016

Symptoms drivers report with P0340

  • The car cranks for ages before finally firing up (limp mode start).
  • Engine suddenly cuts out while waiting at a roundabout or junction.
  • A noticeable lack of 'grunt' or pick-up, feeling like the turbo isn't boosting.
  • The rev counter bounces erratically or drops to zero while driving.
  • The car smells of unburnt petrol because the ECU is guessing the fuel timing.

Repairs that clear P0340

  • Replace cam sensor (cheap, common fix)
  • Repair wiring loom or connector
  • On chain-driven engines, check chain wear before condemning sensor

For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P0340 guide.

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