How can fine out wat it really is
A fault code has generated in the ECM.
Being that your car is a 1996 it is probably OBD II and will require the use of a tool to determine the error.
Most likely it's your O2 sensor. Has it ever been changed?
This link will show you all you need to know about determining the fault that is causing your light to come on.
Error codes
http://www.pelicanparts.com/bmw/techarticles/Mult-Code_Reading/Mult-Code_Reading.htm
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