After my yellow ignition light came on and looking at the two fault codes that popped up I believe relates to the secondary air pump failing. There are four parts to this system, solenoids and two valves and the actual pump. Im assuming its the pump as my car is 13 yrs old and high mileage, Audi wanted £475!!!!!! So as usual looked around and found one on eBay for £120! I know it's situated under the air box, I am changing the spark plugs and air filter anyway myself so I want to change the pump as I am pulling out the air box. should it be a straight forward swop over or are there any problems lurking??????