It has 97k miles and I just changed the spark plugs but it is still shaking a bit at idle. Rpms don't fluctuate. It also shakes a little at speeds over 80 mph but that could be the wheel balance?

It ran fine for four months after purchasing it from the original owner, then it just suddenly sat down. Any ideas from this meager amount of info what the problem might be?

Exclamation Yellow mark.

Pls Advise

i have took it in for service but they couldn't determine the problem. they cleaned and changed the break pad, after two weeks the noise will return.
i don't think the breaks was problem. do you think it has to do with the rear axel?

After changing the oil on my Porsche Cayenne I need to turn the service light off. If you could tell me how to do this it would be very helpful.