The engine U1066 Code is a short identification of the engine problem and it lets know some information about the engine problem. This code is found for the network problem of the car engine and this problem is not very difficult to solve. About the engine U1066 code, it would perhaps be valuable to carefully inspect the wire harness near the intake various bracket. This is completed the most easily from below the car in the zone near the oil filter. Verify the car engine and you can know the reason of the car engine problem easily. Do not try to fix the car engine if you have no idea of the engine problem.