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  1. p0451 Code

    Focus RS TroubleShooting
    Back in mid march, I noticed a CEL upon cold start after a heavy/wet snowstorm. P0451 "Evaporative Emission System Pressure Sensor/Switch Range/Performance" I believe my tank was full, but can't entirely remember. Cleared it and it stayed away for a few weeks. Next time I saw it was upon...
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