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OK the vehicle will not start now correct? Was there any work done prior to the issue ?
Ok did this start after replacing the ECU ? Also does the vehicle crank over at all now?
Ok did you have your old keys programmed to the new ECU?
Yes but did they actually use a scanner to program the keys to the vehicle ? Also try disconnecting the battery with the key on the on position and see if it makes an difference and see if it starts thanks.
OK sounds like there is an issue possibly with the crank sensor do you know the number code for the engine light?
Ok are you able to check the crank sensor yourself ?
This link will help. http://troubleshootmyvehicle.com/jeep/4.0L/how-to-test-the-crank-sensor-1 Let me know how it checks out.
No problem. Please rate excellent service.