P0451 OBD II Trouble Code Evaporative Emission Control System Pressure Sensor Range Performance

Symptoms of P0451 OBD II Trouble Code

  • In most cases, there will be no symptoms exhibited with a code P0451
  • A slight decrease in fuel efficiency
  • MIL (malfunction indicator lamp) illumination

Common Causes of P0451 OBD II Trouble Code

  • Defective EVAP pressure sensor
  • Loose or missing fuel cap
  • Clogged fuel tank pressure relief valve
  • Broken, collapsed, or burned EVAP hoses/lines
  • Cracked or broken charcoal canister