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Old 12-06-2010, 01:49 PM   #1
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Getting P0455 DTC code

I have a 2004 Porsche Boxter. Recently the Check Engine Light has started coming on, usually soon after I have refuelled. I have a generic code reader, and it shows P0455. I can clear it, and it usually doesn't come back on until I refuel again.
Any ideas on what is wrong?
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Old 12-06-2010, 02:13 PM   #2
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Bad gas cap or disconnected hose on EVAP unit. Usually the gas cap, which is also the cheapest and easiest to replace............
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Old 12-06-2010, 02:29 PM   #3
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Would that not show a P0457?
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Old 12-06-2010, 02:45 PM   #4
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From Porsche's OBD II manual"

"P0455: Fuel tank pressure below lower limit

Possbile cause: Loose, missing or defective gas cap
Vent lines disconnected from EVAP canister......."

I could go on, but I think you get the picture........................
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