059919501A Engine Coolant Temperature (ECT) Sensor Audi A6 Q7

This 4-pin sensor performs a dual role: it sends a temperature signal to the dashboard gauge for the driver and a separate signal to the Engine Control Unit (ECU) to manage fuel injection and cooling fan operation. It is widely considered a "must-replace" maintenance item because the original black-colored sensors were prone to high failure rates.

Vehicle Compatibility:

• Audi: A4 (1996–2008), A6 (1998–2004), TT (1998–2006), and S4/RS4/S6 models.
• Volkswagen: Golf/GTI (1999–2006), Jetta (1999–2005), Passat (1998–2005), and Beetle (1998–2010).
• Other Brands: Also used in various Skoda (Octavia, Superb) and Seat models