P0455 on Toyota: Evaporative Emission System Large Leak Detected
Severity: 1 of 4
Safe to drive in most cases. Check the gas cap right away. If you smell strong raw fuel or see dripping fuel, park it and get it inspected, because that may be a liquid leak rather than a vapor leak.
Estimate range covers the repairs listed below; see the cost breakdown. A flashing check engine light, a hot temperature gauge, or brakes that feel different mean stop driving and get help.
What P0455 usually means on a Toyota
Toyota EVAP systems commonly set P0455 from loose gas caps and canister or vent valve faults. Some Toyota models use their own additional EVAP codes alongside the generic ones.
Most likely causes on Toyota vehicles
- Gas cap
- Vent valve
- Charcoal canister
- EVAP hoses
Order reflects cost and likelihood in general; your vehicle may differ. Confirm with testing before buying parts.
Toyota specific tips
- Tighten the cap until it clicks and wait a few days of driving.
- Do not overfill the tank.
Estimated repair cost
This is an estimate, built from typical parts price ranges plus labor hours times an assumed shop rate of $110 to $190 per hour. Actual prices vary by vehicle, region, and shop. Diagnosis fees are often extra.
| Repair | Parts | Labor | Estimate (low / high) |
|---|---|---|---|
| Gas cap | $10 to $35 | 0.0 to 0.1 h | $10 + 0.0 × $110 = $10 $35 + 0.1 × $190 = $54 |
| EVAP hose | $15 to $80 | 0.3 to 1.0 h | $15 + 0.3 × $110 = $48 $80 + 1.0 × $190 = $270 |
| Vent or purge valve | $25 to $150 | 0.3 to 1.5 h | $25 + 0.3 × $110 = $58 $150 + 1.5 × $190 = $435 |
Costs are generic for this code; parts and labor on some Toyota models may run higher.
Watch a repair video
How To Fix Large Evap Leaks On Your Car P0455 (Scotty Kilmer). Third-party video, loads from YouTube (privacy-enhanced mode) only when you press play. Procedures vary by vehicle. Search YouTube for “P0455 Toyota fix” videos.
Repair manuals
Step-by-step service manuals for Toyota with torque specs and wiring diagrams:
Haynes manuals for Toyota Chilton manuals
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Check Toyota recalls
Enter your VIN at the NHTSA recall lookup before paying for repairs.
FAQ
Is P0455 common on Toyota?
Yes, especially on trucks and SUVs.
Read the full P0455 guide or more Toyota check engine notes.