Idle speed higher than expected on Vauxhall — A14NET PCV diaphragm and crankcase pressure issues.
Vauxhall P0507 — Idle speed higher than expected on Vauxhall — A14NET PCV diaphragm and crankcase pressure issues. Typical UK independent garage cost: £140–£380.
What actually causes P0507 on a Vauxhall
A14NET P0507 is normally a torn PCV diaphragm in the cam cover — whole cover assembly replacement is the fix.
Vauxhall engines that log P0507
- 1.4 Turbo A14NET
- 1.6 SIDI A16XER
- 1.0/1.4 Turbo B14XFT
How we diagnose P0507 on a Vauxhall
- Smoke-test intake
- Oil filler suction
- Full cam cover replacement
The common misdiagnosis to avoid
Pattern cam covers fail again within months — only Iwis/GM OEM lasts.
Vauxhall P0507 repair cost in the UK
Expect £140–£380 including parts and labour at an independent garage. Main-dealer quotes on Vauxhall 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
A14NET P0507 — cam cover, GM only.
Codes usually seen alongside P0507 on Vauxhall
- P0171
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.