The wife set off to work this morning in our 2008 1.8T A4 and said it was misfiring, sounded like a tractor so she turned round after 1/2 mile and limped home. She said a light was on which she looked in the handbook for and turned out to be emmissions sensor light. Have rung thde RAC who are coming out tonight to look at it when I get home but am wondering if this is usually an easy fix or wether it will require a trip into the dealership. It has only done 26k and recently serviced and MOT'd, It has Audi warranty so not an issue other than our nearest dealer is 45 miles away and the wife will be without a car until it's sorted. Any advice appreciated.