Honda Civic SI 2008 emission control system

The "check engine" light is an indicator for a system that monitors many electronic functions in the system, also called the "malfunction indicator lamp" (MIL). It can come on for any of hundreds of different causes from any of the systems that the computer monitors. Some are very important and can lead to further component or engine damage and some are emissions related not as serious but still a problem and need to be repaired.

Your first step is to have the computer scanned to retrieve the trouble codes that were set when the check engine light came on. Those codes will give you specific information about what the computer saw and will get you pointed in the right direction to find your problem. With a 1996 or newer and some 95 cars and you have an AutoZone or Advanced auto parts in your area, they will read them for free. Once you have these code numbers, we can be a lot more specific about what your problem may be.

You'll have to drive it until the codes come back.

I can't tell you anything. You erased all the info.

That code indicates a rich condition. I think you need to get rid of the aftermarket stuff.

You have to find the reason the engine is getting too much fuel and the new intake is the #1 suspect. You probably eliminated or bypassed the IAT too. Can't do that stuff on a computer car.

Intake Air Temp sensor. Yours is built into the MAF. Many of those kit tell you to install a resister in the IAT line to fool it into running richer.

You just need someone knowledgeable to examine it and determine what is causing the problem.