A3 1.8T Sport 51 reg. I have the afore mentioned model which a few weeks ago the above mentioned dashboard warning light came on, i did not waste any time and took it to my local garage for diagnostic testing . It came up with three faults 1. turbo valve sensor . 2. throttle body . 3 coolant sensor. The turbo sensor was replaced and after approximateley 100 miles the light came back on , again i took it back and the test meter showed the same three faults , they reported back to me that they had been testing various things ie lambda sensor was slightly down on co2 but not signifiacant to effect the running of my car. I have now done a further 100 miles and the light has come on but the running of the engine appears to be ok , should i be taking this to an audi specialist or has any body got any info as to what would cause this to keep happening .