Quote:
Originally Posted by GCC2773
I recently purchased a used 2008 M3 - convertible.
I was getting the 'Reduced power' notifications others have described. I took it to BMW and had new software upgrade and Dinan power upgrade as well. It's been about 100 miles since then and still occasionally getting the same message and also an 'emissions' warning. Any feedback is appreciated.
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You need to acquire an OBDII scan tool to read the actual code. There are inexpensive options and very expensive ones as well - stand alone tools or connectors to computers/tablets. For example, I have both a USB cable for Windows and a bluetooth scantool dongle for an Android app.
You might start by going to an auto parts store that offers free code reading to customers. You can then look up the meaning of the codes you find in this thread.