MKL lights up and on ABS every now and then

Good day dear community, need your expertise because I am only layman. Engine control light is on and rarely it shows errors in the board computer in the VDC. ABS it almost always shows up and therefore I had it read out twice. In the first workshop the reading took good 15 minutes and he spit out a total of 22 errors and in the second workshop only 6 errors. Amongst them was: ABS sensor faulty front left – is on the shopping ticket – exactly which one I don’t know, because they somehow want to know about it, I have no idea. I think ignition errors or failure with the cylinder 3.5 and 6 – thought of new spark plugs – Brisk tuning spark plugs are in the in-cook car. On the display in the cockpit I also don’t know if I can trust the 90 KM country road and city/village and it shows me only about: 75 degrees to? I thought of coolant temperature sensor – but where is the exactly ? Thermostat ? Have seen, but there is ESP on it, so KMT sensor with ESP probably knar and it shows me about 2.5, but it’s quiet for me.