P0456 on Toyota: Evaporative Emission System Very Small Leak Detected
Severity: 1 of 4
Safe to drive. It affects emissions, not engine operation. Repair it before your next inspection.
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 P0456 usually means on a Toyota
Toyota vehicles frequently set P0456 from very small leaks at the gas cap seal or canister. These leaks are hard to see.
Most likely causes on Toyota vehicles
- Gas cap
- Canister
- EVAP hoses
Order reflects cost and likelihood in general; your vehicle may differ. Confirm with testing before buying parts.
Toyota specific tips
- A smoke test is the efficient way to locate it.
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 |
| Smoke test diagnosis | $0 to $0 | 0.5 to 1.0 h | $0 + 0.5 × $110 = $55 $0 + 1.0 × $190 = $190 |
| EVAP valve or hose | $15 to $150 | 0.3 to 1.5 h | $15 + 0.3 × $110 = $48 $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 Find an EVAP Leak (P0440, P0442, P0455, P0456). Third-party video, loads from YouTube (privacy-enhanced mode) only when you press play. Procedures vary by vehicle. Search YouTube for “P0456 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 P0456 hard to find?
Often, yes.
Read the full P0456 guide or more Toyota check engine notes.