3-Series (E46, E90)Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.
I can tell you the E39 has 4 O2 sensors: 2 precat located on the manifold wired to a coupling on the top of the head, 2 aftercat located on the exhaust pipe wired to a plastic box on the left side of the car.
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