Citroen Bitron sensor

Jul 26, 2004 4 Replies

Citroen Xantia 1.9 turbo diesel with aircon. 1996 if it matters



Whilst driving home I had the over heat warning lamp come on and the engine stop light briefly illuminate. As I was only a few yards from home I didn't do anything but when I got home the fans were whirring away even though the rad was almost cool. The engine hadn't overheated and the temperature gauge was reading normal. I put the heater on as I was driving and got plenty of hot air out and the coolant level was fine when I stopped. According to the Haynes BoL the Bitron sensor controls the fans and the overheat light and says that it can only be tested by a Citroen garage. Is this true? I've just done about 4 miles since the incident and the engine got up to normal temp on the gauge without any further symptoms


-- Malc



Don't be humble. You're not that great.


Bitron is a control unit that controls various warning funtions. There are two temp sensors on the cylinder head, I think there are three on some models. Separate sensor for temp gauge and diesel control. Probably a faulty temp sensor. There is a blue and green colour code for the sensors, but I can't remember which is which.

The sensor is on the thermostat housing but seems to be ok after this evenings run. I'll see after the 40mile commute to work

-- Malc

Ok I'll have a look. My local friendly Citroen specialist reckons that just occasionally you can get a glitch from these things or it could possibly be the thermostat. As it hasn't done it since I'll not worry for now.

-- Malc

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