When Secondary AirInjection fault codes appear, you'll need to have someone with a PST2 run a diagnostic on the Air Injection system. The PST2 can have the vacum pump manual turn on to check for vacum issues and have the Electronic change over valves switch on to verify functionality... Without a PST2 tester, you might end up replacing afew parts you didnt need to in your secondary air injection system... Its made up of many check valves electronic and mechanical and a Vacum pump. This wil definatly require a PST2 for quick painless repair.
I have 2 secondary air injection Pcodes for both banks and since my box has alot of miles im just going to buy all the components and replace them... minus the vacum pump.



