Why do Audi 80 models before 1993 have issues with the coolant temperature sensor?

I've noticed that many early Audi 80 models (pre-1993) have issues with their coolant temperature sensors. What causes this issue and how can it be fixed?

Many early Audi 80 models use a single-wire coolant temperature sensor, which is prone to corrosion and can cause inaccurate temperature readings. It is recommended to replace the sensor with a newer, more reliable two-wire sensor.

The issue with coolant temperature sensors in early Audi 80 models is due to a faulty ground connection. It is important to check for any loose connections or wires and repair them as necessary.

One potential reason for coolant temperature sensor issues in Audi 80 models is the use of low-quality or counterfeit sensors. Always opt for genuine, high-quality sensors from reputable brands to avoid any future issues.