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When the Battery, Brake and TCS light are on, that means the Alternator is not charging properly. The air bag light also verifies this. It's most likely on due to it detected low voltage. That triggers that light to come on also.
I would recommend to get the Alternator from the dealer and have either the dealer install it, or your mechanic. If you get the part from your local auto parts store, it normally only lasts a year at the most if you even get one that works.
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