Investigating P0455 on Your 2022 Mercedes-Benz C-Class
A P0455 on your 2022 C-Class (W206) means a large EVAP leak. This all-new generation C300 with the 2.0L turbo is likely under warranty. Gas cap is the first clue to investigate.
Evidence
- Check engine light on
- P0455 stored
- Possible fuel odor
- Gas cap issue
Causes Ranked
- Gas Cap Seal (Very High Likelihood): Loose or worn. $0–$35.
- EVAP Purge Valve (Medium Likelihood): Sticking. $200–$400 installed.
- Leak Detection Pump (Medium Likelihood): Mercedes LDP. $280–$500 installed.
- Fuel Tank Vent Valve (Low-Medium Likelihood): Seal failure. $220–$420 installed.
- Vapor Line (Low Likelihood): Connection issue. $120–$280.
Diagnosis
Try the gas cap first. If P0455 returns, a Mercedes dealer with XENTRY diagnostics can pinpoint the fault. Independent MB shops are a cost-effective out-of-warranty option.
Warranty
Your 2022 C-Class is likely under Mercedes' 4-year/50,000-mile warranty through 2026. Federal emissions (8yr/80k) covers EVAP through 2030.
Safe to Drive?
Yes. P0455 doesn't affect the turbo engine, 9G-TRONIC, 4MATIC, or any features.