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Google …Z4 trifecta
Also resetting steering angle sensor…
Handheld scanners only rarely are able to read and reset BMW proprietary error codes.
With ISTAD you can read an error code and then diagnose the issue it's causing and recommended fix …. ISTAD is diagnostic software for that specific purpose. There are YouTube tutorials on how to use it. You can download the software for free now and buy the necessary cable off of eBay/Amazon …
I have/use an old windows computer specifically just for this purpose…
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Sent from my smart phone...
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