P0455 on Mazda
Evaporative Emission Control System Leak Detected (Gross Leak)
P0455 on Mazda vehicles indicates evaporative emission control system leak detected (gross leak). Au7o has documented this code across 2 Mazda models — most commonly on Mazda3, Mazda5. 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. Typical repair costs on Mazda range from $80 to $1,800, depending on the specific model and root cause.
Common Causes of P0455
- •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
P0455 on Mazda by Model
Mazda Mazda3(1 issue)
- EVAP Purge Valve Failure and Fuel Odor2014-2018
Third-generation Mazda3 models with the SkyActiv 2.0L and 2.5L engines experience premature EVAP canister purge valve failure. The valve can stick open, flooding the engine with fuel vapors and causing rough idle, stalling, and a strong fuel smell. Conversely, a stuck-closed valve prevents the EVAP system from purging, triggering check engine lights for evaporative system leak codes.
Mazda Mazda5(1 issue)
- A/C Evaporator Core Leak2006-2015
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.
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View P0455 across all makes →Frequently Asked Questions
What does P0455 mean on 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 specifically, this code is documented across 2 models.
What causes P0455 on Mazda vehicles?▼
Common causes on Mazda: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0455 on a Mazda?▼
Repair costs on Mazda range from $80 to $1,800, depending on the specific model and root cause.
Which Mazda models have P0455 documented?▼
Au7o has documented P0455 on 2 Mazda models: Mazda3, Mazda5.