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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old November 3rd, 2005, 10:10   #1
Join Date: Oct 2002
Location: Blandon, PA
Default what to check next 17964 Charge Pressure Control

been having the 17964 Charge Pressure Control code for a while now and so far I have.
Changed air filter
Replaced MAF
Cleaned Intercooler
Cleaned Intake Manifold
Cleaned N75
Am in the research process of buying vacuum lines to replace the old ones.

I am looking for something else to check while i am doing the last item any idea's?
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Old November 3rd, 2005, 10:18   #2
Veteran Member
Join Date: May 2004
Location: Humboldt Co CA
Fuel Economy: A4 = wife drives it, don't know
Default Re: what to check next 17964 Charge Pressure Contr

Cleaning the N75 may not be good enough - but changing out the lines may fix the problem, so don't buy one until it becomes the only option.

Check the intercooler tubes very carefully. You may have done this when cleaning it, but make sure the system doesn't have any split in it.
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Old November 3rd, 2005, 10:36   #3
Join Date: Oct 2002
Location: Blandon, PA
Default Re: what to check next 17964 Charge Pressure Contr

the n75 didnt seem very dirty when i cleaned it out a little dark stuff came out but im thinking more vaccum problem.
just waiting for a reply to see if high tem silicone had the 5mm as well as the 3.5mm I know they have. anyone see a place that sells both?
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Old November 3rd, 2005, 19:32   #4
Join Date: Aug 2003
Location: Ann Arbor, MI
Default Re: what to check next 17964 Charge Pressure Contr

Use a Mity-Vac to pull a vacuum on the hose that leads from the N75 to the turbo and see if the vacuum holds. If it holds, and you've got at least 20" of vacuum on the "supply" side of the N75 with the engine running, replacing all of your vacuum lines probably won't help.

I cleaned my N75 and considered EVERYTHING before giving in and buying an N75. Details here

If you've got at least 20 inches of vacuum on the brake booster side of the N75, and the VNT isn't operating freely, my bet would be on the N75 being bad. Mine was not operating the VNT properly even though it made all the right noises during the VAG-COM output test. The dealer replaced the injector pump and turbo under warranty and never even suggested that the N75 might be the problem, even though that would have been a "customer pay" repair and not covered under warranty at 60,000 miles.

I'm not saying to just replace it blindly, but if your VNT is not operating freely, loosen it up with some spray penetrating oil and some elbow grease, then check to see if your turbo works properly afer swapping your N60 with your N75 (they look the same except the N60 has a black top, and the N75 has a white top).

If everything works well with after swapping these parts, order yourself an N75 for $60 plus shipping and you'll be as happy as when the car was new.

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