Honda P0455

EVAP gross leak on Honda — fuel cap and well-known charcoal canister vent valve on Civic/Jazz.

Honda P0455 — EVAP gross leak on Honda — fuel cap and well-known charcoal canister vent valve on Civic/Jazz. Typical UK independent garage cost: £25–£320.

What actually causes P0455 on a Honda

Honda P0455 — fuel cap first, vent valve second. Honda issued a service campaign on certain vent valves; check VIN.

Honda engines that log P0455

• Civic 1.4/1.8/2.0
• Jazz 1.2/1.4
• CR-V 2.0/2.4

How we diagnose P0455 on a Honda

1. Fuel cap test
2. VIN check for campaign
3. Vent valve test
4. Smoke-test EVAP

The common misdiagnosis to avoid

Honda dealers replace canister assemblies under campaign — out of scope, the vent valve alone works.

Honda P0455 repair cost in the UK

Expect £25–£320 including parts and labour at an independent garage. Main-dealer quotes on Honda 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.

Service campaign / TSB note

Honda vent valve service campaign covers selected Civic/CR-V production.

Bob's workshop tip

Civic P0455 — VIN check is free, do it first.

Codes usually seen alongside P0455 on Honda

• P0441
• 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.