Possible Causes
WARNING: This page is about a different car, the 2003 Mazda B4000, 2003 Mazda B3000, and 2003 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
Possible causes are:
- Aftermarket EVAP hardware (i.e. fuel filler cap) not meeting required specifications (DTC P0455).
- Blockages or restrictions in fuel vapor hoses/tubes (DTC P0455).
- Canister Vent (CV) solenoid stuck open (DTC P0455).
- Damaged EVAP canister (DTCs P0455 or P1443).
- Damaged EVAP canister purge valve (DTC P1443).
- Damaged or missing fuel filler cap (DTC P0455).
- Disconnected, cracked or cut fuel vapor tubes/hoses except between fuel tank and EVAP canister (DTC P1443).
- Disconnected or cracked fuel EVAP canister tube, EVAP canister purge outlet tube or EVAP return tube (DTC P0455).
- EVAP canister purge valve stuck closed (DTC P0455).
- Fuel vapor control valve tube assembly or fuel vapor vent valve assembly blocked (DTC P0455).
- Insufficient fuel filler cap installation (DTC P0455).
- Loose fuel vapor hose/tube connections to EVAP system components (DTC P0455).
- Mechanically inoperative Fuel Tank Pressure (FTP) sensor (DTC P0455).
- Pinched, blocked or plugged fuel vapor tubes/hoses except between fuel tank and EVAP canister (DTC P1443).