i've seen a lot of audio displays going bad, and on some (2.4l 4cylinder) the exhaust cam wasn't hardend properly and it has premature wear. the good thing is the audio display is covered under an extended warintee as for the exhaust cam, hopefully you purchaced the extended warintee, the average cost for repair on that is well over 600 $ just for parts but i have only seen this on vehicles with over 60,000 miles so... good luck