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Old June 3rd, 2007, 19:56   #2
Join Date: Jul 2006
Location: Denton, TX

I'm going to add a little bit to this... btw... great writeup

Limp mode is best described as a complete loss of turbo power, when you key off and key back on your power should be back,
If this is not your symptom, you should check the MAF 101 page... which just says unplug your maf, and if it's better or the same, then it's bad. BTW... if you are running a K&N air filter... unplug the MAF first.

I think you should scan the car first...

There are three common codes for limp mode.
Boost Deviation Intermittant
Boost Deviation Negative
Boost Deviation Positive

Boost Deviation Intermittant means you most likely have a vacuum leak somewhere. Check all lines, actuators, and plastic fittings.

Boost Deviation Negative means you have a clogged intake, actuator that's leaking, bad vacuum lines, or a sticky turbo.

Boost Deviation Positive means you have a N75 that's bad/malfunctioning, actuator that's leaking, bad vacuum lines, or a sticky turbo.

In addition... the A3 and B4 models (1998 and older, jetta, passat) have a Vacuum line in the ECU... but basically the same procedure... They run on boost, not vacuum, so a tire pump may be of use to see if the actuator is working on the turbo.

Last edited by alphaseinor; January 5th, 2008 at 18:42.
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