3 week old FiST throwing CEL - P0451

Discussion in 'Fiesta ST Maintenance' started by scooby2, Dec 12, 2013.

  1. scooby2

    scooby2 New Member

    Has anyone seen this before? I cleared it once and it came back after a few days. I really cannot believe this thing is throwing a CEL already. The dealer cannot get me a loaner until next week.
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  3. D1JL

    D1JL Well-Known Member

    P0451 - Evaporative Emission System Pressure Sensor/Switch Range/Performance
    This DTC sets when a fuel tank pressure (FTP) sensor range (offset) concern is detected. The FTP sensor output is offset by greater than 1.7 inches of water or less than -1.7 inches of water.
    Possible Causes:
    • Intermittent open in the FTP sensor
    • Intermittent short in the FTP sensor
    • Intermittent open FTP circuit
    • Intermittent short FTP circuit
    • Contaminated FTP sensor
    • Damaged FTP sensor
    • Damaged PCM

    I am sure the dealer will fix it just fine.

  4. scooby2

    scooby2 New Member

    Thanks for the quick response.
  5. scooby2

    scooby2 New Member

    Verdict was the fuel pressure vapor sensor was bad and they replaced it. Everything seems good now!

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