How do you reset maintenance light, reset service light BMW with 20 pin connector. For reset maintenance light and that can be made manually by use button on car dashboard.

Reset service light, engine oil life BMW with 20 pin connector, oil reset instructions:

How to reset oil maintenance light on BMW with 20 pin diagnostic port without a special tool

1. Turn the key to the OFF position
2. Find round diagnostic port under the hood of the vehicle and remove the cap
3. Use a jumper wire (paper clip works really well too) to jump port numbers 7 and 19 (see diagram above)
4. Turn the vehicle to the ON position without turning the engine on
5. Wait 10 seconds and then remove the jumper wire with the key still in the ON position
6. The service indicator should return to full green bars and the warning should go away