[Shotimes] Why does the CE light go on if the gas cap isn't tight on OBD II cars?

[George Fourchy]

On Wed, 29 Jan 2003 13:54:01 -0600, Paul L Fisher wrote:

>Any clue?

I don't know 100%, but I'd bet the fuel vent system is measuring the amount of
ambient air pressure inside the tank vs outside, and if it isn't right, it thinks
that vapors are getting out into the air.  I have heard that those new systems
monitor the venting of fuel vapors to the outside via the gas cap.

George