P0492 - Secondary Air Injection System

4.2 V8 32v Naturally Aspirated - 414 bhp
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amdaman
Neutral
Posts: 19
Joined: Mon Oct 16, 2017 7:25 am

P0492 - Secondary Air Injection System

Post by amdaman » Sun Oct 14, 2018 9:09 pm

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 :)

Gary(rs4)87
2nd Gear
Posts: 188
Joined: Mon Jul 10, 2017 5:51 pm

Re: P0492 - Secondary Air Injection System

Post by Gary(rs4)87 » Sun Oct 14, 2018 9:14 pm

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.
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amdaman
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Re: P0492 - Secondary Air Injection System

Post by amdaman » Sun Oct 14, 2018 9:24 pm

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

Gary(rs4)87
2nd Gear
Posts: 188
Joined: Mon Jul 10, 2017 5:51 pm

Re: P0492 - Secondary Air Injection System

Post by Gary(rs4)87 » Sun Oct 14, 2018 9:26 pm

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

eljay
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Re: P0492 - Secondary Air Injection System

Post by eljay » Mon Oct 15, 2018 3:13 pm

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

amdaman
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Re: P0492 - Secondary Air Injection System

Post by amdaman » Mon Oct 15, 2018 10:26 pm

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.

amdaman
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Posts: 19
Joined: Mon Oct 16, 2017 7:25 am

Re: P0492 - Secondary Air Injection System

Post by amdaman » Wed Oct 17, 2018 4:41 am

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!

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