A3T180cv - Chipped - P1556
 

What does "17964 or 1556 charge pressure control negative deviation" on the vagcom mean? How can I fix this?

RE: A3T180cv - Chipped - P1556
 

17964 - Charge Pressure Control: Negative Deviation


Try clearing the code and see if it comes back.

RE: A3T180cv - Chipped - P1556
 

I changed relay,MAF,N75 and the problem is existis.On my Audi A3 2000 I've lost turbo boost to 5 psi and i cleared the ecu every time.

RE: A3T180cv - Chipped - P1556
 

Have you changed all of your vacuum hoses?

RE: A3T180cv - Chipped - P1556
 

Yes, all had been tested and they do not present problems.

RE: A3T180cv - Chipped - P1556
 

Before "chipped" it did not present this error.

RE: A3T180cv - Chipped - P1556
 

How exactly were they tested? The fact that it didn't do this before chipping makes it even easier to believe it is a leak. I would go buy a couple meters of vacuum line and change them all out. It will only cost you a small amount. Vacuum line leaks are VERY difficult to detect, especially if it is a hairline crack.

RE: A3T180cv - Chipped - P1556
 

I am with this problem 3 months and I nobody find. The car enters in "limp mode" and when I bind and I disconnect it comes back to have pressure.

RE: A3T180cv - Chipped - P1556
 

bind and disconnect, i'm confused. What does that mean exactly?

RE: A3T180cv - Chipped - P1556
 

Excuse me, I want to say when switching off the engine and re-starting it always cures it (until the next time).