Hello I am new to jeeps and my girlfriend just bought one was very excited but now have problems. it is a 2011 Sahara with the 3.8L and 85000 miles on it. we bought it from a dealer and about 3 hours later check engine light came on it was (injector circuit 201-206) dealer took it back and said it was not calibrated correctly all was fine for about 2 days. then the display went out on the radio turned the jeep off let it sit then the display worked again a day later check engine light came on again turned off later that evening. now the left front headlight went out everything looked fine with the light so I reset the computer and now it works again so i am pretty convinced I have a computer issue. what I am wondering is is this common on these. Can I just put a new one in and go? Or how big of a mess do I really have on my hands thank you in advance with any feedback

 

Could also be bad/loose connections at the battery. Be sure the cables are connected tightly to the battery. If that looks good, start checking grounds. You might find some of this info helpful.

https://www.jk-forum.com/forums/jk-c...ations-220210/

https://www.jk-forum.com/forums/jk-e...-266688/page2/

 

To really diagnose, you need one of the enhanced ODB scanners -- See the link in sig below for a write-up. After what jedg mentioned above, the most common module to go bad and give those symptoms is the TIPM.

 

Mr. T is correct. If the grounds check out, run a scanner on it and be suspicious of your TIPM.