Its for my 92 740 turbo wagon. After changing the air mass meter, the\ngas mileage went up to normal for a couple of weeks, and then\nplummeted again. Needs another new part. Rock Auto has a Bosch sensor\nfor . But I seem to remember a few months ago someone in this forum\ntold me of a source for one that is only around $ 60. The car is\nsetting a code for "adaptive lambda either too rich or too lean at\npart load". It is 3-wire , heated type.