Generic OBD-II scanners can only tell part of the story when it comes to...

https://dlf-ne.org/e90-bmw-common-wiring-harness-issue-what-symptoms-show-up/

Generic OBD-II scanners can only tell part of the story when it comes to European cars in Malaysia. Manufacturer-specific codes often need specialist tools to diagnose accurately. Plus, sourcing genuine parts is tricky—counterfeits are everywhere