Passat B5 Temperature Sensor Testing

[barrybro]

Hello all. I have a 2001 180T Passat. Can you help. I need to establish if my coolant temperature sensor is faulty. My sensor has 4 pins. I would like to know what resistance readings one should get between pins 1&2 and between pins 3&4 at ambient temperature (say 20C and at high temperature +100C). In particular does anyone know if the internal circuitry is the same for the two sets of pins? Further if I have the ignition on, what voltage using a DC voltmeter should I measure between pins 1&2 and 3&4. Thank you.

[Col]

Can't answer your questions but would say these are such a common failure and are relatively cheap that it is probably simpler just to replace it.

Why are you worried about it? What symptoms are you getting from the car?

[barrybro]

The temperature gauge is erratic. Sometimes works perfectly other times stays at 0C so not sure if I have a wiring problem or whether temperature sensor is failing intermittently.