Check Engine - Three Codes Displayed
 

Hey all,

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 Flow
• 17819 - Secondary Air Injection System; Bank 2
  P1411 - 35-10 - Insufficient Flow - Intermittent
• 16805 - 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!

If anyone stumbles on this thread looking for answers, I was given help in another thread and got the problem solved : AudiWorld Forums - View Single Post - Check Engine Light - Three Codes Displayed

Have the air lines smoked to look for leaks in the secondary air system.

Hey Crazy...thanks for the reply. I was able to get it fixed in the thread I mentioned just before your post.