Had this car in 2 weeks ago from another garage to turn off the mil light.The car came in again yesterday with light back on and now they want to know would it be a big job (expensive) to repair.Had a quick look and the code on snappy is P0410 secondary air injection .The o2 control ready before cat is switching from yes to no at idling.Asked the dealers does the air pump give trouble and they said they never had to sell/repair an air pump.The car drives ok with the light on.The car is coming back to me on Tuesday for a proper look ,so any piece of information or direction would be appreciated as I get worried about faults that dealers have not seen.