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Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by CEC, May 17, 2011.
Can anyone help with fault code P0491 and P0492 as in how to fix ?
P0491 16875 Secondary Air Injection System Insufficient Flow Bank 1
P0492 16876 Secondary Air Injection System Insufficient Flow Bank 2
Would indicate possible problems with Secondary Air Injection (AIR) pump relay -J299-
Secondary Air Injection (AIR) solenoid valve -N112-
Secondary Air system seal
PM me your email address and can send you a pdf on testing these aspects.
I have the same problem on my audi q5 3.2 year 2010. i have changed all valves, pump and tubes. after changing i still get the same faultcode. what could it be?