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Hi all,

I got the above code about 500 miles ago (and a pending P0491) but now it came back quicker than before with just the P0492 so I think i'll have to look into it...

I've done a few searches and it looks like the most common cause is a vacuum leak. I've had my exhausts flap hoses disconnected and plugged for a while so this will be the fist place i'll check but does anyone know where the other common vacuum hose faults are? I do have a VCDS so i'll also be testing the pump when I get the chance.

Any common or obvious places to check (or pictures) would be greatly welcomed,

Cheers

Under the intake manifold,
If you standing opposite to the engine, on the middle there is T-pipe which one of them is connected in to the one way valve. That was the issue on mine and had a same issue like yours.

Cheers Gary, did you have to remove anything to access the rear as from memory the engine goes right to the firewall!

This one is on the front so I’ve just removed the front end then I noticed that this pipe has split. So Iv ordered new vacuum pipe and fitted. All ok now

Awesome. Have the same errors plus stuck open flap so I presume something similar. Will check this weekend.

I had a quick look at the hoses I could see and it all looked ok. The rear vacuum hoses were also plugged up with screws so it must be something I can't see, maybe at the front as Gary has suggested... or the pump its self.

Either way I couldn't be bothered to mess with it so it's at Audi now, they are going to check it out with their smoke machine.

I'll keep you posted.

So Audi had a look, did the full vacuum line check with the smoke machine and also tested the pump which was all ok. They recommended I changed the relay so hopefully that sorts it!