Volkswagen P0455

EVAP system gross leak on VW — N80 purge solenoid failure is the headline cause across the TSI range.

Volkswagen P0455 — EVAP system gross leak on VW — N80 purge solenoid failure is the headline cause across the TSI range. Typical UK independent garage cost: £30–£280.

What actually causes P0455 on a Volkswagen

VW Group N80 canister purge solenoids fail constantly — they stick open, allowing vacuum to evacuate the EVAP system continuously, and P0455 stores. The fuel cap is the cheap first check. Cracked EVAP hoses under the car (especially near the rear axle on Golf Mk5/Mk6) are the third most common cause.

Volkswagen engines that log P0455

• 1.4/1.8/2.0 TSI EA888 (Golf, Passat, Tiguan)
• 1.2/1.4 TSI EA111
• 1.6 FSI / MPI

How we diagnose P0455 on a Volkswagen

1. Check fuel cap seal and tightness
2. VCDS: read EVAP system status and trigger purge valve test
3. Pinch-test the purge valve line at idle — if RPM doesn't change, valve is faulty
4. Smoke-test EVAP if first two steps don't reveal the fault
5. Replace N80 with revised VAG part (cheap, 5-minute job)

The common misdiagnosis to avoid

Don't chase EVAP leaks across the entire car before swapping the N80 — VW N80 is so notorious that replacement is often the first move, not the last.

Volkswagen P0455 repair cost in the UK

Expect £30–£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

Golf Mk5/Mk6 owners: the N80 lives on the throttle body — usually visible without removing anything. £25 part, £40 fitted at a specialist.

Codes usually seen alongside P0455 on Volkswagen

• P0440
• P0442
• P2187

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.