Audi a3 2.0 litre fsi cylinderhead problem

If the timing belt snaps, they run into each other, causing bent valves (most common), cylinder head or camshaft damage, and possibly piston and cylinder wall damage. ... In a non-interference engine, the pistons and valves don't occupy the same space, so if the timing belt snaps, no valve or cylinder damage occurs.
nissan are all Interference engines

That is a interference engine. I'm afraid your vales are now bent. The head must come off.

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God bless you

The timing diagram of the chain sprockets inside 2007 Audi Q7 4.2 FSI

If the motor is an interference motor the valves could have been bent from contact with the pistons after the timing belt broke. If it's not an interference motor then it will be fine once the belt is replaced. What motor does it have?

55,000 miles recommended if already changed the original one

Sorry to say there is most likely quite expensive damage to the valve train and pistons. A new cam belt can be installed and the motor rotated to see if it is turning freely after which you would do a compression check (lack of compression will indicate bent or broken valves). I've never seen a diesel break a belt and avoid damage, virtually always a catastrophic failure.

If there is a serious problem, the the cylinder head will have to be repaired.

when the timing belt broke it also bent the valves,hence the broken rocker arm. pull the head and see the valves are bent

what is the liter size of your engine? the 1.8L is an interference engine. generally all Audi engines are interference engines, and timing belt breakage can bend valves, the sure way to determine without detailed maintenance information, install a new belt, once the belt is on immediately run a compression test, if timing marks are good and compression fails, valves are bent.