engine replaced in b4 flashing power button and check engine

[b4 legacy]

HI new to this forum ,

i recently replaced the engine in my b4 now the power button is flashing and the check engine light is staying on, it is a automatic . Any help much appreciated

[Huffer]

Pull the codes... sounds like when the engine was replaced a couple of sensors weren't hooked up right...

[b4 legacy]

cheers for the help will check the codes, could it be anything else??