P0455 means the engine control unit has detected a large leak in the evaporative emission system. This is a more significant leak than P0442, often caused by a missing fuel cap, a completely disconnected EVAP hose, or a cracked charcoal canister. The large leak size usually makes it easier to find.
DTC/P0455·Opel
P0455 on Opel: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Opel
P0455 on a Opel means the engine control unit has detected a large leak in the evaporative emission system. This is a more significant leak than P0442, often caused by a missing fuel cap, a completely disconnected EVAP hose, or a cracked charcoal canister. The large leak size usually makes it easier to find.
Repair cost on Opel€9 - €432
What does P0455 mean on a Opel?
Opel Corsa
2006-2024The Corsa D and E have the charcoal canister mounted near the rear axle where it is exposed to road debris. Cracks in the canister housing are a known cause of P0455. The fuel cap uses a simple screw design that can lose its seal after frequent use.
What causes P0455 on a Opel?
Beyond the generic causes listed on the main P0455 page, these are the Opel-specific patterns we see most often:
Opel CorsaCracked charcoal canister from road debris impact
Opel CorsaWorn fuel cap seal
How to diagnose P0455 on a Opel with OBD2
Follow these steps to pinpoint the root cause of P0455:
- Check the fuel cap immediately. If it is missing, loose, or the seal is visibly cracked, replace it, clear the code, and monitor over several drive cycles
- With the fuel cap confirmed good, perform a visual inspection of all EVAP hoses. Follow the lines from the fuel tank to the charcoal canister and from the canister to the engine. A large leak is often visible as a completely disconnected or split hose
- Perform a smoke test on the EVAP system. A large leak will produce a visible plume of smoke, making the source easy to locate
- Inspect the charcoal canister for cracks, particularly on the plastic housing and at the hose connection points
- If no external leak is found, test the purge valve and vent valve by commanding them with a scan tool. A vent valve stuck open during the EVAP test will register as a large leak
How much does P0455 cost to fix on a Opel? (EUR)
Estimated repair costs on a Opel (Opel parts and labour typically run 10% below the average for this code).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0455 on Opel
These codes commonly cluster with P0455 on Opel vehicles:
FAQ: P0455 on Opel
Is P0455 serious?
It is not mechanically harmful and will not damage your engine. However, a large EVAP leak means significant fuel vapour is escaping into the atmosphere. The check engine light will cause an automatic failure at any EU vehicle inspection.
Can I just tighten the fuel cap to fix P0455?
If the cap was loose or missing, yes. Tighten it until it clicks and clear the code. The ECU will re-test the system over the next few drive cycles. If the code returns, there is an additional leak beyond the cap.
What is the difference between a small and large EVAP leak?
The ECU categorises leaks by size. P0442 is a small leak (equivalent to a pinhole), while P0455 is a large leak (equivalent to a 1mm or larger opening). Large leaks are usually easier to find because they often involve a disconnected hose or missing cap.
Why did P0455 appear after a fuel fill-up?
The most likely reason is that the fuel cap was not tightened properly after refuelling. On some vehicles, overfilling the tank (topping off past the first click of the nozzle) can also saturate the charcoal canister, triggering EVAP codes.
How much does it cost to fix P0455?
If the cause is a fuel cap, the fix costs 10 to 40 EUR. A hose replacement runs 40 to 170 EUR. A charcoal canister replacement is 120 to 480 EUR. Start with the cheapest possibility first, as the fuel cap is the culprit in a large percentage of cases.
Looking for the full P0455 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0455 guideSkanyx · Opel
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