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Michael Warfield
Michael Warfield, Factory Mercedes-Benz Technician
Category: Mercedes
Satisfied Customers: 3142
Experience:  Mercedes-Benz Master Certified technician
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I have a new mercedes cla250. after running it through a car

Customer Question

I have a new mercedes cla250. after running it through a car wash i hear a thumping sound when going over even the smallest bumps coming from the rear passenger area.
What could be causing this?
Submitted: 1 year ago.
Category: Mercedes
Expert:  Michael Warfield replied 1 year ago.

Most likely it is a coincidence that it happened after the car wash but this can be caused by a faulty rear shock. I have had the problem once before and it was just the valving inside the shock. I wouldn't think the car wash did any damage to the rear suspension but I would let the dealership look at it and repair it under warranty as long as there is no physical damage. Please let me know if you have any questions before you decide to rate me, thanks!