Solving P0455 on Your 2019 Mazda3
P0455 on your 2019 Mazda3 means a large EVAP leak. This 4th-generation Mazda3 with the SKYACTIV-G 2.5L is out of basic warranty but emissions coverage applies. Gas cap first.
Symptoms
- Check engine light with P0455
- Fuel smell possible
- Gas cap worn after 5+ years
- Emissions test failure
Causes by Likelihood
- Gas Cap Seal (Very High Likelihood): Degraded. $10–$20.
- Purge Solenoid Valve (Medium Likelihood): Age-related. $120–$240 installed.
- Canister Vent Valve (Medium Likelihood): Seal wear. $110–$230 installed.
- Vapor Hose (Low Likelihood): Heat damage. $70–$180.
- Charcoal Canister (Low Likelihood): Saturated. $180–$350 installed.
Warranty
Basic warranty (3yr/36k) has expired. Federal emissions (8yr/80k) covers EVAP through 2027.
Safe to Drive?
Yes. P0455 is vapor only.