Fault Code Diagnosis (was Coolant Leakage Solved-BUT)

Taka Mizutani t44tqtro at gmail.com
Tue Aug 2 19:37:41 EDT 2005

Either the factory 1551 tool or VAG-COM will do the same thing- they
will both show any diagnostic fault codes and there are 10 channels of
real-time data that can be monitored.

Your shop is correct in that the diagnostics on a '91 200q20v are
primitive compared to the later cars, but there are a bunch of
possible fault codes.

VAG-COM is an emulation program invented by Uwe Ross-
www.ross-tech.com. His program is a very inexpensive alternative to
purchasing the very expensive factory tool. The factory 5051 tool is
megabucks now- $6k+?

What exactly are the issues with your car? The usual culprits if
you're experiencing low boost are addressed at Scott Mockry's website:

Some more unusual issues are not dealt with- I had a low boost issue
that ended up being an altitude sensor failure, very odd.


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