I don't know what kind of car this is because you did not specify,however the iat is prbably not hooked up this will cause the mil light to iluminate and if that's all you've done than if that is the proble than it will reset itself,if it is hooked up than try removing the battery cables for about 5 min you can also hold the pos and neg cables together for 30 second this will drain the capacitors in the ecm.sorry the iat is the intake air temp sensor its a two wire thermistor sensor.
disconnect the battery for ten minutes
Problem with emission system or fuel cap not installed properly
Check ground wires... and all connections.
An intake mixture of that is low on fuel signifies a "system to lean," condition causing your check engine light to come on. This is mechanical condition needing to be corrected because when lean predetonation - or engine damaging knocking can occur.
.The check engine light can be reset, after you install a new air intake, by removing the instrument panel fuse. The fuse can be located in the fuse box
Connects air filter and engine.
Usually a problem in the emission control system or fuel cap not installed properly. Have vehicle scanned to determine the problem
Yes
Yes a bad senser in any vehicle will turn your engine light on. Even a performance air intake will turn your engine light on.
Check your engine codes, your airbag is disconnected or blow or not installed?
This the engine management system warning light.
If not installed properly check engine light will illuminate