hey guys have recently bought a 2001 s3 amk engine - had engine management light come on last week and gave error code once read of P0012- which as u probably kno is "A" camshaft position - timing over-retarded (bank 1) - wiped code engine management light gone off but engine making tapping noise at idle- have now literally just changed cam position sensor but tapping noise still there just drove it down the road engine management light flashing and lack of power -- any ideas ?!? (Coil pack is on recall and is being changed by Audi 9th may)