These are the likely candidates:
P0440 Fuel Tank Ventilation System - Above Limit
P0441 Fuel Tank Ventilation System - Above Limit
P0442 Fuel Tank Ventilation System (Micro-leak) - Below Lower Limit
P0444 EVAP Canister Purge Valve - Open Circuit
P0445 EVAP Canister Purge Valve - Short to B+/Short to Ground
P0446 EVAP Canister Shutoff Valve (Function) - Below Lower Limit
P0447 EVAP Canister Shutoff Valve (Output Stage) - Open Circuit
P0448 EVAP Canister Shutoff Valve (Output Stage) - Short to B+/Short to Ground
P0450 Tank Pressure Sensor - Signal Implausible
P0452 Tank Pressure Sensor - Short to Ground
P0453 Tank Pressure Sensor - Short to B+
P0455 Fuel Tank Ventilation System (Major Leak) - Below Lower Limit
Really need to know exactly which code you're getting. Might be worth investing in an affordable code reader.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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