got error code p0411 of course relating to air intake issue. some preliminary info. i installed k&n CAI about a month before i got the error. The day before i got error and after 3 days of 20 degree temp. my car started rough and headlights and dash lights were flickering (getting a little dimmer then brighter) with the idle and after about a minute idle was fine and lights stopped flickering. The day of error i was out driving in the rain and cold......ok so fixes for this error code from what i read is the secondary air intake front passenger side since it's location water can get in there and freeze etc. so replace it and error resolved. But i've also read that it can be a week battery not suppling enough amps etc. with the rough start due to cold and the flickering lights thinking maybe it's the battery. any suggestions on what to try first since a new battery is a little cheaper than the air intake but air intake requires a lot more work? or should i just do both?

 

P0411 Secondary Air Injection System Incorrect Flow Detected. See http://www.obd-codes.com/p0411 for more info. Good luck...