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Discussion Starter #1
Had five codes pop up yesterday.
16795
16995
18057
16683
17887
Any ideas why these would all pop up.
 

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Wrong area. Judging on your last posts, you have a B5.5 I guess? Ya gotta give us some info if you want any real help.
 

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16795 P0411 Sec.Air Inj.Sys. Incorrect Flow Detected
16995 not listed
18057 P1649 Data Bus Powertrain Missing message from ABS Control Module
16683/P0299/000665 - Boost Pressure Regulation: Control Range Not Reached
17887/ P1479/005241 - Brake Boost Vacuum System: Mechanical Failure

I suspect a large vacuum leak as that would affect 3 of the 4 codes I could find. Check all cloth covered lines, hoses and check valves around and under the manifold and the one going under the coolant tank towards the fender. The suction jet pump may have failed, but you should have some misfire codes with a large enough vacuum leak.
 
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Discussion Starter #6
16795 P0411 Sec.Air Inj.Sys. Incorrect Flow Detected
16995 not listed
18057 P1649 Data Bus Powertrain Missing message from ABS Control Module
16683/P0299/000665 - Boost Pressure Regulation: Control Range Not Reached
17887/ P1479/005241 - Brake Boost Vacuum System: Mechanical Failure

I suspect a large vacuum leak as that would affect 3 of the 4 codes I could find. Check all cloth covered lines, hoses and check valves around and under the manifold and the one going under the coolant tank towards the fender. The suction jet pump may have failed, but you should have some misfire codes with a large enough vacuum leak.
Thanks
 

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Just an FYI, cloth covered hoses stopped being a thing with the introduction of the 2003 model year on the Passat.

IIRC, P0299 could be a boost leak. A hole in the intercooler, loose hose, etc.
 

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I though the hose from the vacuum reservoir under the coolant tank was still cloth covered for the 2004-5 1.8T.
 

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I though the hose from the vacuum reservoir under the coolant tank was still cloth covered for the 2004-5 1.8T.
Shoot, you're right. Forgot about that one. I was fixated on the others that changed over like the N249, N75, 710 DV, FPR hoses.
101620
 
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