It's kind of flakey (like they intentionally tried to make it hard to do) but after 5 or 6 tries I can get this to work: Hit the Status button until the A/C filter status comes up, then press the Reset button. Try holding Reset down if necessary. Eventually, you'll get a message to press and hold the Reset button to set the filter life to 100%. Do that and you're good for another cycle. I'm not sure how many miles are in a cycle. Maybe 15-20,000.