Hi Guys

Anyone can help me identify the 3 coolant sensor on a 190E 2.6 1991.

On the left side of the head there is one 4 pins in the far back near the firewall. This one should used 2 pins for the injection and 2 pins for the ignition. Right or wrong???

The second sensor are just a 1 pin sensor must me for the aux fan. Right or wrong???

The third one are just few inch apart from the second one and its blue with 2 pins. What is it for???

My car suffer from SSS( Sudden Stalling Syndrome) and I suspect the third coolant sensor to be the gremlins because it do not follow the NTC(negative temperature coefficient) graph for coolant sensor. Should this sensor follow the NTC graph or it should not???

Max