Cylinder 1 misfire on Vauxhall — A14NET coil pack and Z19DTH injector cyl 1 wear.
Vauxhall P0301 — Cylinder 1 misfire on Vauxhall — A14NET coil pack and Z19DTH injector cyl 1 wear. Typical UK independent garage cost: £70–£500.
What actually causes P0301 on a Vauxhall
Vauxhall P0301 — coil pack on A14NET (very common), injector wear on Z19DTH. Always swap-test before condemning.
Vauxhall engines that log P0301
- 1.4 Turbo A14NET (Astra J/Corsa E)
- 1.6 SIDI A16XER
- 1.9 CDTi Z19DTH
How we diagnose P0301 on a Vauxhall
- Swap coil 1↔2
- Injector correction read on diesel
- Spark plug condition
- Compression test if mechanical
The common misdiagnosis to avoid
Cheap coil packs on A14NET fail again within months — Delphi/Bosch OE only.
Vauxhall P0301 repair cost in the UK
Expect £70–£500 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
Astra A14NET P0301 — Bosch coil, OEM spec. Don't cheap out.
Codes usually seen alongside P0301 on Vauxhall
- P0300
- P0302
- P0303
- P0304
Symptoms drivers report with P0301
- Engine 'juddering' like a wet dog when you try to overtake on the A9.
- The car 'kangaroos' at low speeds, especially when the engine is stone cold.
- The EML (Engine Management Light) is flashing at you—that's a 'stop now' warning for your catalytic converter.
- A distinct 'put-put-put' sound from the exhaust pipe at idle.
- Massive loss of power, feels like you're towing a caravan that isn't there.
Repairs that clear P0301
- Replace spark plug
- Swap coil pack
- Injector test
- Compression test
For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P0301 guide.