Sorry, not had chance to frequent the forum for many months due to work issues. I was a bit reticent at posting up exact details of the resistor mod since I didn't want it to be considered a complete solution to the air pump code issue; I did it since I was removing the pump. The resistor merely makes the ECU sense current through the pump circuit when the pump is disconnected preventing the code being thrown for an open circuit pump - I think there are other conditions under which the code is thrown to so the 'fix' only deals with an open circuit pump motor - if you are hearing the pump run for a while when you start the car from cold, then the resistor mod won't help. Anyway, I used a 47R 3 watt resistor (because that is what I had) which will feed about 250mA through the pump circuit (the pump actually draws 10's of amps)

HTH.

Simon.