I just replaced the ECU on my 2008 GTI. I'm able to start it and run it but it run poorly and the dash flashes sensor 5 times and then reads_ _ _ o F. Does anyone know what that means? Thanks for any help I get.
When I run my ski out of the water my depth finder puts that on the dash when the sensor can't get a reading.. I believe the ECU has to be coded to see the depth finder sensor. Possibly your new ECU needs to be coded?
Regarding the rough running - are you getting any error codes when you do the 5x mode button?
I don't have a mode button if I get any codes the automatically come up. I'll talk to the dealer to see if I have to have it set to the machine. You would have thought that they would have said something to me when they programmed the key. They know I just replaced the ECU