Sorry, missed this...


You have two simultaneous codes, one for each O2 sensor?

It is unusual for two parts to fail simultaneously... two possiblke causes:

1. A wire got damaged underneath;
2. the fuse to the sensors is damaged.

If you are gettig a "pre-heat circuit" failure, then this is NOT related to their 'function'...when the car starts up, immediately power is delivered to the sensors to warm them up- this is different that the sensing function (this is why there are 4 wires to each). Look at the wiring diagram, see of there is a common fuse (on other BMWs there IS and it is NOT in the fuse box (!!!!)). Or look at the common connector underneath for damage.

GL

A