Code result
P0451
Evaporative Emission Control System Pressure Sensor Range/Performance
Moderate severity
What it means
The fuel tank pressure sensor reading is implausible — for example, fluctuating signal, noise, or values that do not respond to known pressure events such as a key-on tank refill.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Tank pressure sensor drifted/noisy
highOne of the most commonly reported causes for this code — check this first.
Sensor element aged beyond calibration window
lowLess common, but worth ruling out after the more likely causes.
Sensor mounting loose - signal damping
lowLess common, but worth ruling out after the more likely causes.
Related help
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