S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

Need help with code

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Old Sep 2, 2008 | 01:08 PM
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Default Need help with code

Heres the code 17965-charge pressure control: positive deviation. P1557-35-10---Intermittent

So i found a bpv that was leaking at 15psi so now that i got that fixed im boosting the full 19-20psi. I did alot of driving last night and think i got some throttle cut, lots of high boost freeway runs. Then i noticed at a stop light i was in limp mode with only 8psi. pulled over restarted it and boost is back. Did this twice in one night, probably 100miles of driving. vag'd it this morning to find the same code. Do i need to run a mbc to cap spikes or what? or maybe its the N75 valve or my wastegate lines?

heres a link to my last thread on it
https://forums.audiworld.com/s4/msgs/2836553.phtml
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Old Sep 2, 2008 | 01:10 PM
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Pressure test for leaks 1st...
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Old Sep 2, 2008 | 01:15 PM
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no but im pretty confident i dont have any leaks
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Old Sep 2, 2008 | 02:06 PM
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what does mvb 32 say?
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Old Sep 2, 2008 | 05:37 PM
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Default you can clear the codes as you drive and notice boost returns without restarting your car

I've been through this and I believe the N75 was replaced.
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Old Sep 3, 2008 | 10:01 AM
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are u sure it was the n75?
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Old Sep 4, 2008 | 02:33 PM
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Pressure tested and found no leaks, any ideas?
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Old Sep 4, 2008 | 06:15 PM
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Not positive if it was the N75. I do know that clearing the code while driving got rid of limp nt
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