I just checked my thermostat and when I reinstalled it and ran the jeep the check engine light came on. I guess bc I remove the sendi g unit wire. How do I override the engi e light?

 

Try disconnecting the negative battery cable for a few minutes.

 

Scan the code and fix the problem.... Probably messed up the coolant temp sensor in someway

 

To completely clear the codes, you need to disconnect the battery cables and touch them together (most people say to hold them together for 30 seconds) as this will discharge the capacitor. Then just hook them back up. This will clear the codes until something trips them again.