Hi I purchased an A2 1.6 Petrol FSI with an injector fault on Cylinder 4 and the orange engine light on. I got a mechanic I did not know well who was quite cheap on price to take the whole engine apart after cleaning up the earth behind the passenger front light to replace the injector with a £20 second hand one. This made the engine run better but the engine light was still on. So by that time I was able to take the car to my usual mechanic who has the full diagnostic system for the car. This mechanic re[paired the fuel pressure sensor. Some time after that about 50 miles after driving the car as fast as it would go from zero to about 50-60 miles an hour and then stopping. The car started bunny hoping down the road on a dual carriageway. In first second and third gears with the accelerator peddle on the floor the revs would go from 4000 to 1000 and then back up with the car losing power. I took it back to the mechanic I know. He said he plugged it into the diagnostics again and it gave an Audi part code N276. This part was £440 from Audi and not available. This is something you guys talk a lot about in your forums which is why I've joined. My problem is that over this weekend I've tried to find out what that part is which seems to be a pressure regulator valve that on most FSI cars would be on the high pressure fuel pump. But what I've purchased and I have checked it fits the car does not look like that at all and it cost £19.95. Has anyone got a picture of what this component should look like please? Phil