Just bought my A4- temp gauge seems faulty...

[sat1983]

Is it the sensor or thermostat? Temperature doesn't go past 70, might go up a bit but doesn't reach 90c... Either way I have no idea and wondered if anyone would give me a hand fitting a new thermostat? I'm in Leeds!

 

[DieselJake]

Needs the thermostat replaced, would happily lend a hand if Leeds wasn't a million miles from me haha. Best going OEM too, lot's of people also replace the sensor (but I didn't personally).

 

[Mike B]

Might be the sensor.Does the heater work?

 

[ruffrida]

How many times do we hear of this on the B6!! Change the thermostat and the sensor, both OEM parts. Job done

 

[WOLF]

How many times do we hear of this on the B6!! Change the thermostat and the sensor, both OEM parts. Job done

Yeh,we all get this,both oem changed for me.

 

[Mike B]

The sensor is a lot easier than a stat.If the heater works as it should then the stat is OK

 

[sat1983]

The heater is spot on! How much is the sensor and thermostat from Audi?

 

[sat1983]

And would this issue cause a fairly severe drop in MPG?

 

[ruffrida]

Don't alter ya mpg much at all. Both should be no more than £ 50

 

[sat1983]

Any reason why it would have to be fixed then? Not that I wouldn't- every single thing that is wrong with any of my cars gets fixed immediately but if my heater works and you say MPG is unaffected- what's the point?
I'm sure the MPG should be higher though, but I've only had the car 2 days... It shows an indicated 45mpg on a 10mns cruise on the motorway. Saying that I've not tried driving it for longer, maybe it would climb up much more...

 

[IanFM]

My mpg was down before i replaced the thermostat. I would assume that as the engine is cold the ecu over fuels to compensate.

 

[Mike B]

If the heater is fine and it doesn't overheat then the stat is opening and closing so I would change the sensor and see if that helps.Even my 2.5tdi auto gets up to 40 as soon as it goes m/way cruising