Audi Repair Questions? Ask a Mechanic for Answers ASAP
the quick disconnect hoses rely on the hose part being absolutely clean and undamaged, where the spigot plugs inside so try inspecting and wiping out the inside of the hose as the 1st thing - if this doesn't help then replace the hose
the valve / cam cover bolts won't result in a ticking though so this might be a problem with a leaking exhaust manifold gasket as these can 'tick' if the leak is from 1 cylinder - feel around the headd to manifold joint with bare hands on a cold engine to see if you can find any leaks a leaking exhaust will also result in a rough running engine as the o2 sensor signal gets corruppted by the leak
also check that the axle was the correct type as the ABS ring on the stub can be in different locations which would result in no ABS signal into the ECU - it sounds like it might also be the wrong type if you can't tighten the hub nut to fully lock up the stub axle
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