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I was surprised of the lack of pressure on my new RS4, so i took the pressure with a gauge.

Has somebody already been confronted to this kind of problem on S4 or RS4 biturbo?

No doubt 3 issues :
- CHECK ENGINE that put the system in safety control and reduce to 0.5bars (7.25psi)
- Leak in the pressure system
- one turbo out


Thanks to help

Fred

Get the air mass meter checked.

Regards,

Jay

Get a healthcheck full stop. Where are you?

after checking, it was coming from one of the two dumpvalves. So i ordered 2 forge motosport ones today !

I'm french, Britany.

I was having that problem. Both my diverter valves were dead. I replaced them both and slight improvement, but still only around 5-6psi. After a trip down to MRC, the MAF was diganosed faulty. Try unplugging the MAF once you get your new valves in and see if it makes a noticable difference.