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Plenty of threads in this forum discussing this very common problem. Two choices: remove unit and disassemble or simply replace. Here are replacement part #s with 2118705390 being current that should be compatible to shop used:
Hi, I also have similar issue. Is the "Current part" A 211 870 53 90 a newer design (e.g., with bluetooth etc) than the original part (A 211 870 38 89)? Also, between changing it to an Android based head unit and change to A 211 870 53 90, what's the pros and cons? Thanks!