I have a check engine light that pops on and stays on for no obvious reason.
I ran VCDS and these codes popped up:
17831 - Secondary Air Injection System; Bank 1
P1423 - 35-00 - Insufficient Flow17819 - Secondary Air Injection System; Bank 2
P1411 - 35-10 - Insufficient Flow - Intermittent16805 - Warm Up Catalyst; Bank 1
P0421 - 35-10 - Efficiency Below Threshold - Intermittent
Anyone of these you would tackle first??? And any good sources on where to begin? Thanks!