[Shovelhead004]

2004 Passat 1.8 turbo wagon
Had six codes pop up yesterday. With the check engine light.

16795 secondary air incorrect flow P0411

16955 brake switch P0571

18057 ABS message P1649

16683 turbo under boost P0299

17887 Brake boost vacuum P1479

17544 Fuel trim bank 1 P1136
Any ideas why these would all pop up.

 

[VAGguy]

Are you experiencing any symptoms? That would help narrow it down.

 

[John_E]

Everything other than "brake switch P0571" could be vacuum-related. Leak perhaps? How do the various hoses and tubes look? How about those infamous rubber connectors?

 

[Shovelhead004]

Are you experiencing any symptoms? That would help narrow it down.

Just check engine light and seems to be a little sluggish on acceleration

 

[Coache1nine]

I would start looking for a vacuum leak. The P0411, P0299, P1479, even the P1136 all speak to a vacuum leak. The ABS and brake light switch are probably related as well.