My ‘06 470 developed a TOTAL UP rear end with a very bumpy ride.
I followed the advice from the Forum and YouTube. I replaced the TWO ride SENSORS, L and R. I purchased the parts on Amazon, $109.
1. Raised rear end onto jack stands.
2. Removed wheels L&R.
3. SLOWLY removed each SENSOR. (I soaked the mounting hex bolts with JB Blaster)
4. Replaced SENSORS in reverse order.
5. Once the wheels were back on the ground I disconnected the battery for 10mins.
6. Once electric power was restored the car VERY SLOWLY returned to NORMAL stance.
7. I spent 8hrs total. I’m NOT a highly skilled mechanic, with a very basic tool box.