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Old 08-20-2003, 07:31 PM
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Racerguy
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1999 F150 PO443 Evaporative Emission. Need Help

Hi and welcome to FTE

The most common cause of a P0443 is a bad canister purge valve (near the brake booster on the firewall) but also check the vacuum hose to it to make sure it is intact and attached. The valve resistance should be 30-38 ohms across the 2 terminals.
 
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