Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
System functions: Notes
The Active Front Steering system comprises the following functions:
- Steering assistance (= Servotronic)
- Variable steering-gear ratio (= Active Steering)
- Yaw-rate control (= damping of dynamic yaw)
A new function will be added in further development leading to the start of series production of the BMW 3-Series:
- Yaw-moment compensation when braking on a road surface with non-uniform traction
In further development from the E70 , this function is entirely integrated in the Active Steering control unit (3rd generation). Further model series to follow.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.