Hello I have an 86 528e and there is a group of sensors right in front connected to the coolent system. Its right in under the end of the fuel rod that the six injectors are connected to, there is a yellow sensor right there its kinda down further then the rest of the other three sensors. Does anyone know what that is called. It tells my engine how much fuel is needed depending on how cold the coolent is and how much resistance it gives. I hope someone can help me. I think it might be causing my engine to run lean in the morning because that sensor is telling my engine to give me less gas then i need. Thank you Steve