audi a3 1.8t quattro problems

[slewis120]

Hi there i have an audi a3 1.8t quattro and have got a few problems the engine management light has been on with 3 faults turbo throttle valve, air mass sensor and lambda sensor all faults have been reset and the light has came back on. But nw to make problems worse the oil pressure light comes on from time to time and there is a hissing from below the throttle bodies. just wondered if anyone had a good indepth idea of these engines or even a audi or vw technician. thanks