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in mirror
I posted pictures on the location and replacement of an ambient temp. sensor for a 2001 S40. Google "ambient temperature sensor location/replacement" or go to Matthew's Volvo site and search there.
My 2002 has it in the drivers side mirror.
Check the temperature sensor. You should be able to find a resistance value in your manual. If it is within specs, check to make sure the wire to the sensor is not grounded. Quick check would be to unplug the wire from the sensor. If the temperature goes down to cold it is probably the sensor. If not, there could be a short in the wire to the sensor. Worst case scenario is that the guage itself is faulty but the sensor or the wire is more likely.
Usually right above your temperature control on your dash
Next to the thermostat. you will see it when you remove the hose
Try looking on the EGR valve underneath the intake manifold.
Which sensor ???
Trouble code P0072 means: Ambient air temperature sensor circuit low input
On my 2000 International with a Detroit series 60 engine the water temperature sensor is on the back of the engine, passenger side in the cylinder head. Gears
were is the camshaft position sensor on 1999 Volvo s80 turbo
I'm not sure what you're asking, but if you mean that you are getting an OBD-II diagnostic code of P0128 from your Volvo S40, that code corresponds to a problem with coolant temperature. On a first generation Volvo s40 (99-04), this usually means that the thermostat or electronic coolant temperature sensor are malfuctioning or have failed.