What do these errors mean?
My question is that what parts do I need to buy to fix these errors?
P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)
P0431 Warm Up Catalyst Efficiency Below Threshold (Bank 2)
P1423 Sec.Air Inj.Sys.,Bank1 Flow too Low
Tags: 2000, Audi, Came, Check, Engine, Errors, Have, Light, Quarto, These
most likely, the first 2 codes are caused by the condition that is triggering the third. when your secondary air is performing incorrectly, it causes your veh to run rich on startup, so the comp thinks your converters aren’t operaqting correctly. my guess is that you have a 2.8l V6 from the codes. most likely, you have a torn vacuum line going to the kombi valves on the back of the heads, not allowing the secondary air pump to perform correctly. your kombi valves are aluminum cylinder looking things on the back of each head. look at the vacuum line that goes to both vlaves and try to find a leak. it’s pretty common. hope that helps
I have no idea whatsoever. But if u go to a place like pepboys or autozone, they sell repair manuals for specific cars like the one u have. I’m sure there are some sort of explanations for every engine error code u got
Best bet is to take it to an Audi dealership. These are complicated cars.