Warning message "Service Engine Soon" after CAI

I installed my CAI for my 99 Maxima, everything is done and connected. But when I start my car and run it, I still got that warning message at the dashboard that said "Service Engine Soon". Is that a problem or just the temperature sensor that thinks the engine is freezing cause of the cold air.

Reset your ECU, and your car should be fine. Look at www.maximadriver.com under how2.
:D