Error codes on 1992 Volkswagen Jetta

How do I get the error codes for a 1992 Jetta

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1 answer 1 comment
you car is not obd2 compliant. the best place for info and to buy diag testers for vw or audi is http://www.ross-tech.com/index.html trust me, its as good as factory stuff.
To some guy: will that also work on 1999 Audi's?