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Steve, BMW Expert
Category: BMW
Satisfied Customers: 25411
Experience:  BMW Expert
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My bmw 420 has adaptive suspension. The front suspension was

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My bmw 420 has adaptive suspension. The front suspension was repaired due to a collision with curbstone. When driving at moderate speed 50 mph ish the car is not absorbing the bumps very well. It feels as if the back suspension is either too stiff or the dampers are not damping well. This is in comfort mode.
Is there a way to test whether adaptive suspension is working properly. And do these systems need recalibrating if suspension parts are replaced?
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only a BMW main dealer is equipped to test this system
yes calibration is needed after parts replacement
it probably wont do much good to go back to the shop that did the repair, you should use a bmw main dealer if you would like a proper repair
Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.
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Customer: replied 2 years ago.
Steve, thanks. This was a BMW main dealer. I think that they replaced the damaged parts, checked wheel alignment and took the car for a test drive around the city streets. If dealers normally have test rigs that can test adaptive suspension with different (simulated drive conditions) it would be good to know.
no they do not have test rigs specifically for adaptive suspension - that would cost a fortune, but they can interrogate the system with their computer equipment and preform the calibrations, etc.
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Customer: replied 2 years ago.
OK thanks. I will ask them.
Customer: replied 2 years ago.
I guess I would also get a problem if one of the sensors or actuators in the dampers was faulty.
yes, you would.
Customer: replied 2 years ago.
Would the control check fault reporting system spot this and report it on the dashboard?
if the issue was bad enough you would get an error, yes. if a sensor reading was just slightly off but still reporting a plausible reading, then no