What does code P0455 mean on a Audi and is it safe to drive?
P0455: Evaporative Emission System Leak Detected (Large Leak). Here's what it means on your Audi, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
PowertrainMedium urgency
What this code means
A large leak has been detected in the EVAP system. Could be gas cap left off, disconnected hose, or damaged canister.
Common causes for your Audi
- Gas cap missing or not sealed
- Disconnected or ruptured EVAP hose
- Damaged charcoal canister
- Faulty purge/vent solenoid
Symptoms
- Check Engine Light
- Fuel smell possible
Typical fixes
- Install or replace gas cap
- Inspect and repair EVAP hoses
- Replace canister or valves as needed
Repair cost range
For a Audi, repairs for P0455 often fall between $20 and $500, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Audi
Audi P0455 shares VW's N80 purge valve failure pattern on 2.0T models. On 3.0T and diesel models, a cracked charcoal canister or failed vent valve is more common. Perform a smoke test after confirming the fuel cap seats properly.
Most commonly affected models
A4 2009–2016Q5 2009–2016A6 2005–2011