Did find MHK100600L (£176.17+vat) and MKH100820L (£68;54+vat) but both of these are listed as "Sensor - AMBIENT AUTOMATIC AIR CONDITIONING" These are the sensors on the airfilter box.
I have been reading this thread with much interest as i have this exact senario 2000 td5 later programmable ecm, i have sourced a 4 pin sensor have yet to get a 4 pin plug but what axactly is the wiring sequence to the red plug i.e. which pin to which number on the plug any help in this matter much appreciated.
Engineer
Mine has been changed to the later flashable unit complete with remap by mike of dynachip (highly recommended).
Engineer