Do I need to do something ASAP if the battery light went on, yet the car is working.
Light went on yesterday afternoon and I've still been able to turn on the car and drive it even with the light staying on.
It means your battery is not getting the full amount of charge -- it is also a charge light. It usually means that the alternator is going bad.
same answer as above............check the alternater as soon as possible. if your not getting a charge, your battery will eventually run down
While it could be the alternator, you could also have a bad cell in your battery. When was the last time you had it changed? Personally, I got nearly 12 years out of original factory unit.
Charging system issue, normally caused by bad alternator not a battery. The battery may still be damaged from the alternator not charging it though. Put a volt meter between the two posts on the battery is should read 13 to 14.8v if its lower then 13v with vehicle running then you have a charging system issue. Hope this helps.
If you are still driving the car around, make sure you trickle charge the battery overnight every night to avoid being stranded by a dead battery!
auto zone, advanced, chain parts stores, check the charging system for free, allow them to diagnose which is at fault, could be corrosion on a connector, many possibilities, I don't recommend buying the parts from there, as it is a Z, but gives you a place to start,
Looking for a Used Z3 in your area?
CarGurus has 315 nationwide Z3 listings starting at $1,998.
Search BMW Z3 Questions
BMW Z3 Experts