SES Light on and off

[Paulpt]

My SES light on my x5 (01 / 3.0) comes on and off. It seems that when I open the gas cap, it resets and turns off. After driving for a while goes on again.

I have not had a chance to take it to have the code read yet, (actually a couple of times when I was going to go for the reading the light was off).

Could it be this from another posting ?:

http://www.xoutpost.com/x5-e53-forum/...+venting+valve

The reason for it is that it seems that when I open the gas cap it vents or something like that.

Maybe someone here has experienced the same. Thanks in advance for your help.

[R8DX5]

Sounds like a bad O2 sensor. Have the dealer run a check.

[Paulpt]

Thanks for your reply. As I can't get my car into the mechanic for a few weeks would it be bad to run my car with an bad O2 sensor for a while. Can I damage anything?