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code 451???

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Old 12-25-2003, 08:22 PM
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code 451???
i have a engine light on, it says code 451- aux emission control valve. can not find anything about code 451. i have 40,000 miles. 2001 4.6. anyone got an idea
 
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Old 12-26-2003, 11:15 AM
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aux emission control valve
Your code is a fancy way of saying there is a short/malfunction in the FTP (fuel tank pressure) sensor.
 
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Old 12-26-2003, 02:07 PM
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Is that the same code that gets sent when there's a problem with the fuel cap not sealing right.
 
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Old 12-26-2003, 03:22 PM
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Is that the same code that gets sent when there's a problem with the fuel cap not sealing right.
No sir, that would be:

P0455 Evap Emission Control System Leak Detected (Gross Leak/No Flow)

He's getting:

P0451 Evap Emission Control System Pressure Sensor Performance

Same system, but widely different causes.
 
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Old 12-27-2003, 11:07 PM
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thanks on the info, i will look into the FTP
 
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