I have performed a search and only found details on the 1.8t engine. I have a 99 A3 1.6 and have come across a few queries/problems. 1: Does my model have 2 x o2 sensors? 2: If it has two where is the pre cat lambda sensor located and how do i get to it? 3: How do i remove the HT leads to get to the spark plugs? I tried pulling and twisting but i didnt wnat to force them excessively. Thanks.