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Hit a local knowledgeable BMW oriented Indie who has a quality, high level scanner, esp with the 'BMW sub menus', and get a 2nd opin.
Your post, and the dearth of dlr info is not much to go on, for the scan mavens here.
Fwiw, I had P 0172 last summer, which can mean a list of possible items. My Indie checked it with his Launch X431 and BMW programs, showed sub code 12, exhaust gas sensor. Installed a new one in 5 mins, and back to normal.
The point of my anecdote is you need to zero in on the SES light 'reason', then determine a repair possibility vs what the dlr said or didn't say...like having a toothache and the doc wants to cut off a leg and do brain surgery, all on your nickel.
GL, mD
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