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P0446 and car hard to start after fill up

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So I have a check engine light, CEL code P0446, and the car is very hard to start after filling up with gas. This has happened three times in a row so I guess it's not going away. :rolleyes:

Anyway I searched the archives and found someone who was having this same problem, which was eventually fixed by replacing the EVAP canister, purge valve and vent tube. My question is, I'm wondering if all that needs to be done in unison or if I can start by replacing the EVAP canister to see if that solves the problem and then if not proceed to the other two items. The canister appears to be a DIY item (?) whereas I'm not sure about the other two.

Anyone have any thoughts/advice?


2000 Boxster 2.7

91000 miles

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P0446 EVAP Canister Shutoff Valve (Function) – Below Limit

The task of the shutoff valve is to seal the purge air line to the EVAP canister during the fuel tank leak test.

Potential causes are:

– Purge air line blocked

– Flow resistance of EVAP canister too high

Could be a blocked/leaky line or valve - both are a lot less expensive than a new canister.

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