What could be wrong if the engine management light is always on after changing motors?

Cars & Vehicles
Check Engine Light
Peugeot 106

I would be sure to check all the sensors , one is unpluged or broken off.

I have also seen this happen when an engine form a different model year is installed.

More info on the car would be helpful

True, if the motor is from a different year the computer may need to be reprogrammed to accept the variance in sensor input

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