hi, just wondering if anyone out there could help me!? could anyone please tell me where to locate the air temperature sensor on a BMW E36 318I? it is a 1991 model with an M40 - B18 Engine. i have been trying to locate it for weeks but every manual i have looked in only tell you the location on the 6 - cylinder engines! please please please help me! thanx Danny

most IAT sensors are located into induction manifolds, plenums or induction ducts. Sometimes its tricky to locate because, because they are hidden under some parts. What I would do if its hard to remove like in some cases (pretty expensive because you remove the intake manifold) is to get a new one and tap it into induction duct not very close to engine., and dissconect the old one and leave it in place while connecting th harness to the new one. have done that on tuned port injection engines. It wont mess up air fuel mixture at all. Maybe a bit. A bit rich will mean more hp.

Dont know where yours is. (by the way they might not have it or its replced with some sorta high tech speed density sensor that does temp as well)

If you are referring to the ambient sensor that links to the OBC, then it is on the drivers side, adjacent to the foglight and in the air dam.