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If the yellow symbol appear as soon as you turn on the dashboard, stop's light bulbs may be the problem.
If the yellow symbol appear when you switch-on lights, the problem may comes from the position's light bulbs.
Ensure that all of the light bulbs are fully working.
You need to carry out the periodical car service due (e.g. engine oil & filter, air filter, fuel filter, cabin air filter). The "service" spanner symbol "reset" button is placed on the lower right corner of the dashboard. See picture below:
Then you should reset the "service" spanner symbol by pressing on the "reset" button on dashboard, when ignition key is in OFF position. Hold the button pressed and turn ignition key in ON position. Hold the button pressed and see on the dashboard successive numbers will appear: "10", "9", "8", ... , "1", "0". Then release the button and switch OFF the ignition key. The "service" spanner symbol followed by "20000 km" (or "30000 km" depending of the engine type), will appear for few seconds after turning ignition key in ON position, and will dissapear after engine starting. The car service due was reseted.
Check engine light appears because there is some error with one of the sensors in your car.
Take your car to an Auto Zone or any other auto parts shop, they'll check the error and tell you the cause for free.
Hope it helps and please don't forget to rate the answer it helps with my rating, thanks!
P.S. comment if you need more advice.
1996 and newer vehicle have the OBD-2 (on board diagnostics-2) system and you need a scanner to retrieve the codes. You can go to Autozone or some other auto parts stores and they will scan your vehicle for free, or you can buy a code reader for under $100.00. A good scan tool is about $400.00 a great scan tool is about $6000.00. Good luck.
I don't have access to the symbols, but you, as a BMW owner can log on to this site, and have access to the original manual for your BMW with diagrams of all the symbols and what they mean. Good luck, hope this helps. Curt https://www.bmwusa.com/Secured/Content/Forms/Login.aspx