Didn't Audi extend the warrenty on MAFs to 100k miles with no time limit? I know I replaced mine at my own expense but was subsequently reimbursed by Audi when the announced the extension. You should definately check with your dealership to see if you can get it done for free! Bill '00 S4 6sp '01 A4 Avant 1.8tq sport 5sp '87 928 S4 5sp (the 'other' S4)