EVAP gross leak on Vauxhall — fuel cap seal and purge valve on Corsa/Astra.
Vauxhall P0455 — EVAP gross leak on Vauxhall — fuel cap seal and purge valve on Corsa/Astra. Typical UK independent garage cost: £20–£220.
What actually causes P0455 on a Vauxhall
Vauxhall P0455 is fuel cap 50% of the time — replace and clear before going deeper. Purge valve next.
Vauxhall engines that log P0455
- Corsa D/E
- Astra J/K
- Insignia A/B
How we diagnose P0455 on a Vauxhall
- Replace fuel cap and clear
- Smoke-test EVAP system
- Purge valve test
- Inspect hoses
The common misdiagnosis to avoid
Don't quote tank work for P0455 — fuel cap first, every time.
Vauxhall P0455 repair cost in the UK
Expect £20–£220 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
Corsa P0455 — £18 fuel cap fixes most. Keep one on the shelf.
Codes usually seen alongside P0455 on Vauxhall
- P0440
- P0456
Symptoms drivers report with P0455
- Engine warning light appears within a mile of filling up — sometimes the cap wasn't clicked shut
- Strong smell of petrol vapour around the car after parking on a hot day
- MPG barely affected — you'll only notice on the fuel receipts over a month
- MOT emissions test passes but the MIL means an MOT visual fail on any car registered 2018+
- Paired codes: P0440 (generic EVAP), P0441 (purge flow), P0446 (vent circuit), P0455 keeps returning
Repairs that clear P0455
- Refit fuel cap
- Inspect hoses
For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P0455 guide.