On your BMW 325i 1994 e36 a Yellow cog with exclamation mark inside lit up on the dash board what does it mean?

General fault message: a fault has been detected in the engine management system. The engine control unit (ECU) has detected a problem and has stored a fault code in its memory. The fault code can be retrieved by using a diagnostic scan tool.

Some possible causes of the yellow cog with exclamation mark warning light include:

- Insufficient oil pressure

- Engine coolant temperature too high

- Faulty oxygen sensor

- Faulty spark plug

- Faulty ignition coil

- Faulty fuel injector

- Faulty throttle position sensor

- Faulty mass air flow sensor

- Faulty camshaft position sensor

- Faulty crankshaft position sensor

- Faulty engine control unit (ECU)

This issue should be diagnosed and repaired as soon as possible.