Hi,

I have a 2000 Boxter. The check engine light comes on with code PO455 which is "Evaporative Emission Control system leak detected(gross leak). I tried refilling the gas tank to full and making sure the gas cap is tight.

Does anyone know how to fix or what the actual problem might be?

Thanks,

WC

 

I know on Corvettes this isame type of error code is a constant problem that has to do with balance of pressure across the evaporative filter. It is required by law to be on the emissions package and it only works with a certain amount of pressure in the right direction, fuel tank outward, I think. Apparently it is nearly impossible for the air pressure to be controlled tightly enough, all seasons of the year, thorugh this thing. I had my PCM reprogrammed to "hypnotize" the engine computer so no matter how bad this particular reading is, it will never through the engine line on.

I was told all this by a master emissions test technician who works for the state of NC, the guy who checks the dealer's emssions machines and certifies them, as the main reason that the state allows one dfeiciency (one OBD code not passed) in even new cars, because about 3 months of the year, a car just can't possibly pass this due to air temps and what they due to fuel tank pressure or something. Apparently you can design the system to work on cold weather or warm but not both (so he said) But I don't remember if most systems fail in winter or summer. If you just hit a cold spell the first time recently, that may be it.

 

error code table: http://www.spobd2.com/service/diagno...wnload-38.html