That error code means: P0446 Evaporative Emission Control System Vent Control Circuit Malfunction.
That 'probably' (and I stress probably) means there's a problem with the EVAP vacuum switching valve. That's located on the side of the long black intake tube connecting the air filter and throttle body. All that valve does is sense pressures in the engine intake and fuel tank systems then opens and closes when necessary to vent fuel vapors into the charcoal canister.
If your car is fairly low mileage check with the dealer. Emissions equipment is warrantied much longer than most other components on the car so the fix could be covered by Toyota. If not, you can at least get a better idea what to look for while talking with a certified tech.
Cheers
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The Toyota Solara is no longer in production. It was discontinued in June 2009.
I ran a smoke test and found that the vapor canister had a leak at the seem. I put sealer on the seem and solved the problem no more po446 code!
No, it does not.
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