I own a 2009 CX-7 136,000 2.3L purchased from older couple, needed the fuel injectors replaced. When doing the work I unplugged the battery you all know what it take to do the job. After put back together one side of the key cranks the motor now key light flashing won't start. The other side of the Key, light flashing won't do anything. Wait 3 minutes and light will flash 3 times then once? Both Kay's do the same thing.

 

Scan it for fault codes.