A6 4.2 Misfire codes Help!

[Kchewy]

I have a 01 a6 4 2 quattro, that I just got obd2 scanned and it's throwing a handful of codes listed below. If anyone can assist me in resolving the issues as soon as possible. The mechanic's advice was that I have a faulty vacuum hose/leak that's causing these issues.

P0300 : Random misfire detected.
P0491: Secondary air system insufficient flow.
P0492: Secondary air injection system insufficient flow
P0130: O2 sensor circuit malfunction.
P0304: Cylinder 4 misfire.
P0308: Cylinder 8 misifire.

[Hambone101]

Typically the SAI codes will show up with a failing SAI motor. When was the last time you did a tune up? The P130 could be a consequential code due to the others. I'd start with diagnosing the SAI and checking spark plugs.

[Kchewy]

I just got the car and the paperwork says a tune up was done not too long ago, My first instinct is swapping the spark plugs. Will do tomorrow, and report back for any needed assistance.

[Hambone101]

Well if a tune up was just done, swap the #4 and 8 coils with good cylinders. Then clear the codes and drive until they come back. If the codes move to the new cylinders your looking at 2 coils, if they stay then you need to probe a bit more.