My ECU on my 1995 A6 is got wet took it to the shop and they said my ECU was bad, I bought a used one off ebay do I need to have it programed or will it work by just plugging it in?

 

As long as it is the same code and not for a different transmission, (i.e. it came out of a manual and you have an automatic), then you can just plug and go.

 

The guy I bought the ecu from said it was an automatic. For my next problem stopping the front footwell from getting wet again. I currently have the carpet pulled up so I can thoughly dry it. However I haven't been able to figure out how the water in getting in. Checked both sunroof drains, they are clear. Ran a hose over the car and winshield with the front firewall visable, but do not see any water coming in. I am currently stumped and frustrated.