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I did replace the CV on my car, but it still make loud noises when I go over bumps at slow speed. it seems as if something is loose, but the service agent did check all nuts and bolts.
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Sounds like a bad U joint in the drive shaft or axle CV.joint .
When you go over a bump or hole the wheels move up and down the drive shafts and axles have to move along with them or they would bind and break something in the drive train .
When they ware they tend to clunk going in gear power on they get tight power off there loose that's why it makes a noise .
In this order stabilizer links, stabilizer bar bushings, control arm bushings, engine cradle bushings or bad struts mine have 160,000 and don't clunk but do need replacement
The loud clicking noise you described is most likely a worn CV joint in the axle. The noise on rough roads is likely a ball joint or upper control arm ( there are 4 of them on your passat ) .
I would take your car to an alignment shop for a thorough inspection. Don't take it to a VW dealership , they will overcharge you for the work. They quoted me 3 hours labour to replace an upper control arm ball joint. I did it my self in the driveway in 25 minutes.
It may not be your shocks at all. It could be the bearings in one of your CV joints. If you hear the sound when you are turning then that's your problem. Open the windows and drive at a slow speed while making turns. Listen to what side the noise is coming from and replace that CV arm.
If it is a continuous thump (ie thump, thump, thump) that changes in speed with the speed of the vehicle it is likely related to a tire problem.
If it happens when you hit a bump or immediately afterwards it is likely due to something loose or worn out in the suspension.
If it happens somewhat randomly and doesn't seem affected by bumps it may be a loose piece of trim, or something loose under the car getting knocked around by the winds.
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