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You need a scan tool to plug into OBD port
reset service engine light on BMW 325
Reset inspection light on 1989 bmw 325i
The brake pad sensor light is reset by leaving the key on engine off for about 20sec. If it does not reset retry, if it still does not reset check the wiring of the left front and right rear pad sensors
Check out the realted link for some advice on how to reset the computer in your 2003 BMW 325I computer.
Have vehicle scanned to determine the problem (usually in the emission control system) and have codes cleared
you may need to replace the sensor for the coolant, there should be a wire connected to it.
Check the car manual, it has all the stetps. On i-drive veicles go to menu settings- info- reset TPM (tire pressure managment)
The brake warning light on a 2005 BMW 325i can be reset by connecting an OBD II code reader. It can view and clear error codes detected by the computer.
The Brake Wear Indicator Light means your brakes are malfunctioning, worn out, or low on fluid and you need to get them fixed. If the indicator is caused be worn pads, then the wear sensor has worn through and must be replaced - it's not repairable. After the problem has been corrected, reset the indicator by turning the ignition key to position #2 (just before engine start position) but do not start the engine and wait for less than 60 seconds. The on-board computer will automatically check the sensor condition and reset the indicator if no fault exists. (Note that starting the car and even driving it may not allow the indicator to reset.)
this is a German car, there is no "reset" button,
many service lights on the new 3 series you cannot reset yourself, this is a software error by BMW and they are aware of this but currently no fix is available, the only way to reset it is to have a BMW technician reset it with their special service equipment.