hello I have a 2007 Vauxhall corsa 1.3 CDTI, it had a water damaged ecu so I replaced it with a used ecu in working order and it worked, I then took it of whilst I fixed up the car and I put it back on the car today and now there is no communication at all with the ecu. I took the ecu apart and there's no water damage or any burns etc does anyone have any ideas.
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