I have the same problem in my car too there must be soemthing which used to keep it in the whole now when i tryto put in the hole it doesnt saty put it comes off..and about the sensor there seem to be a orange build up on it seems faulty by looking at it so tomorrow (monday) ill replace it one more thing in my 1993 400e i cant find the check engine light i checked my friends 87 260e and he has it in his car i know i sound stupid coz even my 1998 honda has a check engine light ..........
does anyone know wether its an expensive sensor or not ...
thanks once again guys