2017 Porsche P0455: What It Means & Is It Safe to Drive?
P0455 on the 2017 Porsche: Evaporative Emission System Leak Detected (Large Leak). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe 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 on the 2017 Porsche
- 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 2017 Porsche, repairs for P0455 typically fall between $20 and $500, depending on the root cause and labor rates in your area.
Known issues on Porsche
Porsche P0455 large EVAP leak—gas cap seal degradation is common given the large-volume filler neck on Cayenne and Panamera. If the cap is correct, the EVAP purge valve (shared VW Group N80 design) is the next suspect.
Most commonly affected models
Cayenne 2011–2018Panamera 2010–2016Macan 2015–2023