Your check engine light will come on and the computer will give you an emissions code reading. I have had 2 cars show this code and it went away after I replaced the gas cap. Hope this helps.
gas cap seal bad , replace gas cap !!
No, it is not a bad or loose gas cap. It is a problem with the secondary air pump.
No
Most likely, your gas cap or the o-ring on the gas cap is bad and is not sealing properly. It could also simply be that you do not have the gas cap on tight enough.
No, it's usually a vented cap design.
Could be a defective gas cap (bad sealing gasket?)
he would fix it
You have a problem with the EVAP system. Could be as simple as a loose or bad gas cap.
Check your gas cap. I had a 2402 on my S40 and the gas cap was bad, easy fix...
Probably a bad gas cap.
The cap must have an arrow towards where to twist it and it could be bad sometimes to take off
I don't know. I need to align the metal locking tabs with the plastic ring on the inside of the cap and don't know how to do it.