DashingMax

I bought a 2001 Audi A6 4.2 V8 this Saturday. 24-hours later, the check engine light came on! The codes are P0491 & P0492. Secondary Air System Fault. The car has 53,000 miles and is out of warranty.
Would anyone with a Factory/Bentley Service manual please help me diagnoze the solution?
Sincere thanks in advance.

Bobby.
bobbydash@comcast.net

airmax617

where are you?? is it really cold where you're located?

PaulW

Here's a description (at URL below) of how to check the hoses, for some reason they shrink up.

You don't need to check the fuses, just hook up your vag-com and do an output test....it will whirl like crazy if it has power.

BTW, it's the same for the 40 valve A8 motor.<ul><li><a href="https://forums.audiworld.com/a8/msgs/19663.phtml">https://forums.audiworld.com/a8/msgs/19663.phtml</a</li></ul>

DashingMax

No. I am in Chicago. The temperature yesterday and today were in the 70's.
What is the Emissions warranty on Audi's? Is it the same as bumper-to-bumper? 4years-50k miles?
Thx,

PlainRuss

Incorrect flow bank 1 and bank 2? Remove the top engine cover and look at the vac line on the left side on the engine. It goes to a solenoid twords the rear. They will sometimes shrink and pull off. If that happened you just need to run a new length of hose. Good luck.

airmax617

nope emissions warranty is 70K/7years

DashingMax

Excellent. Mine is 3 years old with 53k miles. This should be covered under warranty!!

airmax617

good luck

DashingMax

I could not even find the secondary air pump, nor the fuse nor the relay. I did find the vaccum lines and they seem just fine!

Please advise...

Bobby.

DashingMax

and it does NOT cover secondary air injection!
It only covers catalytic converter, exhaust &amp; ECU.
Just an FYI