406 hdi temp gauge problem - nmidd
I have a 2000 406 hdi 90 with an erratic temperature gauge. It will warm up and be ok some times but then go up and down for no apparent reason while driving. Any ideas what might be causing this?
Also the outside temp gauge on the computer display doesn't work at all, just shows --. Any ideas ?
406 hdi temp gauge problem - LeePower
Sounds like either a dodgy connection or a duff engine temperature sensor.

The outside temp sensor sounds the same fault too, That lives in the passenger side mirror.

You need to have a look at the connector plugs for both sensors & check for dodgy connections.
 

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