Hello to all,
I had the same Steering Wheel Sensor probem in my E90 320d (3/08) and I fixed it yesterday in a Greek BMW Dealer.
Just to inform you guys, that if anyone of you doesn't want to do the whole described above job, you don't need to replace the whole BMW Genuine Part Number: 61 31 9 123 049!!
There is a BMW Repair Kit (BMW Genuine Part Number: 83 19 2 179 894) which replaces the disk, the IR led and applies new lubricant on it.......most important, it costs only 45 Euro the part plus another 80 Euro for the installation, in total 125 Euro!
The above kit applies for models up to 11/2008 ONLY!!
Take care all.....
BMW E90 320d Performance Diesel Power Kit (197 HP)