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The Ecu then sends commands to the fueling and ignition systems according. If the sensor is faulty and thus sends incorrect , or no info to the ecu as above, the fuel and air mixture will be incorrect and thus do as you describe resulting in poor running and no start situations...
If you remember the old auto and manual choke systems..(on petrols - but the principal is the same on the diesel you have )....it works like that , only electronically. If and when the choke was in the wrong position for the temp of the engine, you would get these symptoms.. temp related too..
So, without the aid of plug in diagnostics at the moment and the results thereof - its well worth renewing that sensor.
Always buy one from a dealer / genuine unit. If you are unsure as to its position - ask the parts dept; when you are in there, to show you on the screen where it is located ....
So, thats the way to work through to a cure for you on this.
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