One of the cylinders was misfiring on hard acceleration but it ran fine 95% of the time so kept using the car for commute and then a few weeks later one of the cylinders packed in totally. Took it into a garage and they ran a diagnostics on it and it came back that the problem was the injector on cylinder 1. Audi said they only replace all 4 injectors at £1600, I only need one!! Have managed to find one available online at £180 but i cant get the injector out! does anyone know what tool is needed to remove it? This is the injector that needs removing, can anyone help!?