How to fix check engine

@adamahmed2582 you can't fix it for as long as you do not know what is broken. There are many reasons why the check engine light turned on. For the Jeep WK2 the check engine light is being controlled by the Powertrain Control Module (PCM). Anytime it detects a fault from one of the many sensors that creates a code that starts with "P" (Powertrain) followed by a 0 (Generic) or 1 (Manufacturer Specific) it can turn the Check Engine light on.
You will need to get the OBDII scanned to find out which error codes your engine has. Then use those codes to determine what needs to be fixed. Of course, once you have it scanned, come back here, let us know what those error codes are and we will do our best to help you with that.