Fault code question

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03-24-2005, 08:58 AM

PT S4 BC

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Fault code question

Anyone know what -- 1555 Charge pressure upper limit exceeded --- and 1556 Charge pressure contr. negetive deviation -- refer to ?? I'm experiencing big diff. between requested boost and actual boost

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03-24-2005, 09:13 AM

JBear::FATS

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Pressure test, possible boost leak ..

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03-24-2005, 09:23 AM

Pop3

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might also be bad N75. if you cant pressuretest, check TBB, ic hoses and possibly F-hose!

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03-24-2005, 09:38 AM

PT S4 BC

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How can you test the n75 valve?

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03-24-2005, 09:54 AM

Pop3

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vag block 115? try a new one? you could try to measure boost before and after if its stuck? Try MBC?

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