Right....this has got me confused as hell!! Been having issues with my gauge and random misfires....so replacing both the sensors seemed a logical start. However....I thought there were 2 separate sensors for the coolant. 1-Coolant Sensor - Sends a signal to the ECU (has 4 wires) 2-Coolant Sender - Sends a signal to the dash gauge (has 2 wires) Well not according to Audi there isn't. Apparently there is just one located in thermostat housing that covers both?!?! Can anyone clarify this? And post a link of which one I need please Cheers!