I am new to the whole BMW world so please bare with me..... I have 2010 X5 35D with the same issue. But here is how it happened. I initially had passenger matt sensor fault. I took it to a guy who said he will disable it via the software and no need for dongles. Then I got a call from him telling me that he was able to disable the Matt sensor but my car has ACSM: Driver's airbag, stage 2. I took the car back and after I have been learning I got ISTA installed and I was able to pull the code he was talking about. However, It turns out the code mileage existent was around the time he had the car. So I am guessing he did something that triggered the computer to trigger this code. I also checked the resistance of the airbag, the clockspring and the wires connect to the airbag and am getting the expecting resistance reading. Any Idea how to go by fixing this or troubleshooting it further? ISTA stated if all checks out check the airbag module next, I have been looking all over the web on the location of the module and nothing. How can I revert what this guy did? what tool to use. Can I use ISA/p for that or NCS? Thanks!!