Whilst driving home today I got an exhaust warning light. I have already noticed a couple of people on here have had it - one was for a faulty oxygen sensor and the other for a cracked vaccum hose. Other than the light, the car seems to be running fine.

Has any one else had the warning light come on? What was your diagnosis? Did you notice any deterioration in the car? I am interested in knowing as I am sure the dealership is going to dismiss it as a 'false alarm' because nothing is obviously wrong with the car