Knock Sensor 1 -G61-, REMOVING AND INSTALLING: Installing
WARNING: This page is about a different car, the 2020 Audi A5 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
Install in reverse order of removal and note the following:
-- Install the Engine Temperature Control Actuator -N493-. Refer to Engine Temperature Control Actuator -N493-, REMOVING AND INSTALLING .