Investigating P0455 on Your 2019 Mercedes-Benz E-Class
P0455 on your 2019 E-Class (W213) means a large EVAP leak. Your E300 (2.0L turbo) or E450 (3.0L turbo inline-6) is out of basic warranty but emissions coverage applies. Gas cap is the first investigative step.
Symptoms
- Check engine light on
- P0455 in ECU
- Fuel smell possible
- Emissions test failure
Causes Ranked
- Gas Cap Seal (Very High Likelihood): Worn after 5+ years. $15–$35.
- Leak Detection Pump (Medium-High Likelihood): Common at this age. $300–$520 installed.
- EVAP Purge Valve (Medium Likelihood): Age-related sticking. $220–$420 installed.
- Fuel Tank Vent Valve (Medium Likelihood): Seal deterioration. $240–$440 installed.
- Vapor Lines (Low Likelihood): Heat damage. $120–$300.
Diagnosis
New gas cap first. If P0455 persists, a smoke test or XENTRY diagnostics will find the leak. The LDP becomes increasingly common at 5+ years on Mercedes.
Warranty
Mercedes' 4yr/50k warranty has expired. Federal emissions (8yr/80k) covers EVAP through 2027.
Safe to Drive?
Yes. P0455 doesn't affect the engine, 9G-TRONIC, 4MATIC, or luxury features.