Random check engine light

[Topless]

Troubleshooting guide:
OBD II Code P0440

Yes, if you open your gas cap and look closely at the sealing o-ring. Sometimes these get cracks in them and no longer seal completely, causing the evap sys to be unable to pull a vacuum on your gas tank. This will trip a P0440. A crappy aftermarket gas cap will cause this as well. Make sure it is a Porsche OEM gas cap.

Good hunting!

[ohhh my]

Originally Posted by Topless

Troubleshooting guide:
OBD II Code P0440

Yes, if you open your gas cap and look closely at the sealing o-ring. Sometimes these get cracks in them and no longer seal completely, causing the evap sys to be unable to pull a vacuum on your gas tank. This will trip a P0440. A crappy aftermarket gas cap will cause this as well. Make sure it is a Porsche OEM gas cap.

Good hunting!

Thanks for link and tip on checking the o-ring seal.