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Start with checking in the health of your battery. If your battery is weak some of the lights (Google BMW Z4 trifecta) could be from that. If certain connections were disconnected prior to battery being disconnected some lights illuminated could be from that...
If the battery is weak you will need to replace as BMW a electronics are susceptible to low voltage....
Once you've done that you will likely need to get your fault light/error codes reset to see what's left/still illuminated. Then you can see if there is an outstanding issue still.
There is a small wire (red) that goes to a connection point in your battery well (depends if you have battery in well or not) thats part of the SRS system. If the wire is broken or the inline connection is dirty it will cause that particular light to illuminate...
Handheld code reader won't read BMW error codes (reads engine codes only) so unless you have INPA software you will need to go go BMW/independent specialist to clear the codes.
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Sent from my smart phone...
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