Hi guys, my ecu got some water on it. As a result the car won't start... I tried connected to the ecu with vcds but not luck. I left it for a few days and sprayed contact cleaner etc. I don't have any corrosion or visible damage. But It still wont work when connected to the car, but on my bench setup I can connect to the ecu with no issues. Is there a relatively easy process to fix the ecu, does someone perhaps know why it work work off the car but not on. It's an me7.5

So as ecu works on a bench... I also put a faulty ecu in the car and thay works. So it can't be the harness on the car. I'm not sure if there is any fuse/capacitor on the ecu thats involved when connected to the car