I have recently experienced on the vauxhall vivaro and movano on two occasions these models have had a really bad knocking or banging noise. After initial inspection nothing has been found. Firstly, It’s worth noting at this point that these models are prone to the front top suspension mounting collapsing. This can be simply be diagnosed by looking at the top mount under the bonnet. If faulty the will be a significant gap and it will also be slightly offset. Not central. After inspection this is what happens to the top mounts. Secondly, If this is not the cause of the noise and after frustration trying to find find the noise it is worth checking and tightening all the subframe bolts and wishbone bolts. These may appear tight and show no signs of wear. Once completed road test and listen. Hopefully now the knocking will have gone.
Welcome to fixing common car faults on petrol and Diesel cars and vans. This is a blog helping mechanics and experienced Diy people identify common problems. Guiding to total solutions. Including many guides to help get that difficult job done.