Airbag Light | BMW E46
🚗 2000 BMW 328 (E46)
- Came in with an airbag light on
- DTC in Multiple Restraint System (MRS)
- 20 left side airbag sensor line fault
There are only 3 possible causes for this code
- Left Side Impact Sensor
- MRS (airbag) Module
Left Side Airbag Sensor is located under carpet under driver front seat.
- Check for power at pin 3 and ground at pin 1 of the left side impact sensor (S71).
In my case, wiring was good, but the sensor was corroded from the water intrusion.
Replaced the sensor and all is well.