It’s tricky to see exactly what’s what in your photos but in general if you have only two wires and they are the same colour it’s normally not important, most sensors/switches are switching a negative signal so two brown cables (or a brown and a brown striped cable) is common
regards the engine light some faults auto reset and some do not so depends what faults you have logged,you could do with a scan and a reset of the van, if you dont have access to VCDS get yourself a Carista unit, it’s basic but will read and reset all your fault codes