Check engine light on, after motor installation

I am trying to trouble-shoot a 1996 Honda accord standard 2.2 engine. The engine was replace with a salvage yard motor which I believe was a 1994 motor because the car runs fine but the engine light stays on. Somw one suggested that the distiributer has to upgrade to a 1996 in order to fix the problem. any suggestions are appreciated. Thanks]

Hello Johnnie 123...

Sounds like an ECU issue...New motor installed and old ECU still in the car.

Check to see if the year and engine were compatable with the old engine.

WheelBrokerAng