I have a 1.6 SXI astra mk5.
Ive noticed lately that when ever i go over a bump in the road or a ramp it has a knocking noise from the back of the car.
So...as its 2006 reg i took it into Vauxhall and they said the only noise they could hear was from the tail gate so they tightened that up (now my boot doesnt shut as east as it did).
Anyway i said ok thats fine, got into the car drove off went over a few ramps...noise is still there.
Any idea what this could be?
I had a very similair sound on my corsa and it was the bush joints or something on that and they replaced them under warranty.
Looks like vauxhall are trying get out of it.