P0456 on Mazda: How to Diagnose & Fix
Evaporative Emission Control System Leak Detected (Very Small Leak)
2 Mazda models · 2 documented issues · $800-$1,800 repair
P0456 on Mazda by model: symptoms, diagnosis and fix
The A/C evaporator core in the Mazda5 develops pinhole leaks from internal corrosion, causing refrigerant loss. The evaporator is located behind the dashboard, making replacement extremely labor-intensive. Corrosion is accelerated by moisture trapped in the cabin air filter area and infrequent cabin filter replacement.
Common Symptoms
- A/C gradually loses cooling capacity over weeks/months
- Oily residue on passenger footwell carpet (refrigerant oil leak)
- Musty smell from vents (moisture buildup around leaking evaporator)
- A/C system needs recharging repeatedly
How to Fix
Replace the A/C evaporator core. This requires dashboard removal, making it one of the most labor-intensive A/C repairs. Replace the receiver/drier, expansion valve, and O-rings at the same time. Regular cabin air filter changes help prevent the moisture buildup that accelerates corrosion.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mazda front A/C evaporator CC43-61-J10OEMMazda CC43-61-J10
Front evaporator core after refrigerant leak localization proves the core is leaking Fitment/availability: The inspected OEM page identifies CC43-61-J10, replacing BPYK-61-J1Z, BP4K-61-J10 and CCY3-61-J1Z, at $587.39 with 1-2-business-da…
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Owner tips & cautions
- TipReplace expansion valve and receiver/drier during evaporator replacement - they are accessible once dash is out
- TipChange cabin air filter every 15,000 miles to reduce moisture buildup around evaporator
- TipRun A/C for 10 minutes monthly to keep seals lubricated and reduce corrosion - Mazda5Club.com A/C thread
Sources for this issue (1)
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. The bulletin is not evidence that 2014-2018 SkyActiv purge valves commonly fail, and it does not identify PE01-18-741 as a universal fix.
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.
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-…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
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)
P0456 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 P0456 mean on a Mazda?
P0456 stands for "Evaporative Emission Control System Leak Detected (Very Small Leak)." This emissions code means the evaporative emission (EVAP) control system has detected a very small leak — even tinier than the one flagged by P0442, roughly equivalent to a 0.020-inch hole. The EVAP system traps fuel vapors from the tank and prevents them from escaping into the atmosphere, and the computer tests for leaks by sealing the system and watching for pressure or vacuum loss. Because the leak is so small, the cause is often subtle, but a loose or worn gas cap is still the most common and easiest to check. It generally indicates a minor seal, hose, or valve leak somewhere in the fuel vapor system. On Mazda it is documented across 2 models: Mazda5, Mazda3.
What are the most common causes of P0456?
The most common causes of P0456 are: Loose, worn, or faulty gas cap or cap seal, Cracked or loose EVAP hose or line, Leaking vent valve or purge valve not sealing, Damaged O-ring or seal at the fuel filler neck, Small crack or leak in the charcoal canister, Leaking fuel tank or sending unit gasket, Loose or corroded EVAP component connection. The specific cause varies by vehicle.
How much does it cost to fix P0456 on a Mazda?
Published repair estimates on Mazda range from $800 to $1,800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0456 on a different make?
View P0456 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.