I'm sure this has been covered a million times, but I could really use the "Cold Air Intake for Dummies" course on troubleshooting. I put a CAI on my car about two weeks ago and my CEL just came on. I'm not sure if this is weather related (Rainny and 45 yesterday, -10 today). Also, today I swapped out the rubber vacuum hose for silicone. Could the change be a coincidence?

 

What kind of car do you drive?

 

08 Ms3