I purchased a K&N air charger about a month ago and immediately started having problems with the "Service Engine" light coming on. I disconnected the batter twice to reset it and it keeps coming back within three or four days.
Finally got it into the shop this week. When the dealership checked the computer, the error it was giving off stated the engine was getting too much air. From what the service guy said, the computer is dumping fuel into the chamber to try and keep the fuel to air mixture right. The end result was not all of the fuel was getting burned and some of it was escaping out the exhaust.
The aircharger also creates a horrible octane knock in the engine. Only solution was to start running super unleaded (great). This will solve the knock problem, but not the Service Engine light issue.
Finally, since the air charger is affecting the computer, I was informed it voids my warranty. So unfortunately, I'll be re-installing the stock airbox this weekend.
Has anyone else had this problem? I know Chuck has had problems with the octane knock, but I haven't heard of anyone having the reoccurring Service Engine light issue.