P0455 on Mazda: How to Diagnose & Fix
Evaporative Emission Control System Leak Detected (Gross Leak)
1 Mazda model · 1 documented issue
P0455 on Mazda by model: symptoms, diagnosis and fix
Mazda bulletin 01-002/18 provides a diagnosis path for a 2004-2010 Mazda3 with P0441, P0442, P0455, or P0456. The same code family can come from a loose, damaged, rusty, or leaking filler cap or neck; another EVAP-system leak; or a purge solenoid that does not seal or flow correctly. Mazda specifically notes that P0441 can be stored because of a fuel-filler-cap leak.
Common Symptoms
- Check-engine light with an applicable EVAP code
- P0441 incorrect purge flow
- P0442, P0455, or P0456 EVAP leak code
How to Fix
Do not replace a purge valve from the code alone. Preserve the codes, confirm the cap was tightened correctly, and have a qualified technician follow Mazda bulletin 01-002/18: check related fuel-system DTCs; run the KOEO EVAP test; inspect the filler cap, threads, pipe, and neck; locate other leaks with the specified detector or smoke-test process; and test purge-valve gas tightness. For P0441, run Mazda's KOER purge-flow self-test. Replace the purge solenoid only if it fails the stated sealing or flow test, then repeat the EVAP test. Order any required component by VIN and current Mazda catalog after the failed component is known.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mazda purge solenoid LF82-18-740OEMMazda LF82-18-740
Naturally aspirated i/S purge-valve branch after Mazda's sealing or flow test proves failure Fitment/availability: Live direct OEM page identifies LF82-18-740 as a solenoid valve at $75.33 with 1-2-business-day shipping and Add to Cart. …
- Genuine Mazda 2.3L purge solenoid L301-18-741OEMMazda L301-18-741
2004-2009 Mazda3 2.3L S/SP23/Mazdaspeed purge-solenoid branch after failed sealing or flow test Fitment/availability: Live direct OEM page identifies L301-18-741, replacing L801-18-741, at $120.84 with 1-2-business-day shipping and Add t…
- Genuine Mazda 2010 Mazdaspeed purge solenoid L518-18-741OEMMazda L518-18-741
2010 Mazdaspeed3 2.3L turbo purge-solenoid branch after failed sealing or flow test Fitment/availability: Live direct OEM page identifies L518-18-741 at $62.09 with 1-2-business-day shipping and Add to Cart. Its fitment table lists 2010-…
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Owner tips & cautions
- TipDo not clear the code before diagnosis. Record every stored DTC and whether the cap was recently removed, because Mazda's workflow branches on those facts.
- WarningFuel-system cleaner and a routine fuel filter do not repair a verified EVAP leak or a purge solenoid that fails Mazda's sealing or flow test.
Sources for this issue (1)
P0455 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0455 mean on a Mazda?
P0455 stands for "Evaporative Emission Control System Leak Detected (Gross Leak)." This code means your car's evaporative emission (EVAP) system has detected a large (gross) leak, so fuel vapors that should be sealed inside the fuel and vapor system are escaping into the atmosphere. The EVAP system captures gasoline vapors from the tank and routes them to the engine to be burned instead of polluting the air, and the computer periodically pressure- or vacuum-tests this sealed system. A gross leak almost always points to something obvious and easy, like a loose, missing, or bad gas cap, rather than a deep mechanical failure. It rarely affects how the car drives, but it should be fixed to pass emissions and stop wasting fuel vapor. On Mazda it is documented across 1 model: Mazda3.
What are the most common causes of P0455?
The most common causes of P0455 are: Loose, missing, or improperly tightened gas cap, Worn, cracked, or failed gas cap seal, Cracked or disconnected EVAP/vapor hose, Damaged or missing fuel filler neck seal, Faulty EVAP purge valve stuck open, Failed EVAP vent valve, Cracked or damaged charcoal canister. The specific cause varies by vehicle.
How much does it cost to fix P0455 on a Mazda?
Repair costs vary widely with the root cause and Mazda model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.