I have an 06 a4 with 93 apr, upgraded d/v and cai w/ 49500 miles on it. Check engine light came on and had auto zone diagnos it as 1 bad fuel injector...Any ideas of what happened?? Hopefully it is covered under my warranty

 

lol, i'd like to see the fault code that says "bad fuel injector"

Modifications may void your warranty in the case of a performance issue.

 

Was it just the check engine light going off, or was there a change in how the car ran?

 

It says.... Cyclinder 4 misfire condition
plugged or faulty fuel injector
vacum leak
engine mechanical condition