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There have been lots of reports of MkV GTI (and GLIs?) speedometer reading higher than actual speed. VW initially had an official statement [vwvortex] on this issue, but has since released a TSB on how to fix this issue. See below for link on how to use VAG-COM to make this fix [vwvortex].
- Speedometer error at various speeds:
|Indicated||Actual||MPH diff||% diff|
- VW TSB on fixing speedometer error: "RVU - Instrument Cluster, Update Speedometer Coding (OR)", TSB 00-06-10
- VAG-COM: How to change the "Distance Impulse Number" to (reputedly) affect the speedometer correction factor [vwvortex], and a pic of the VAG-COM screen where you do that:
- Related [vwvortex] threads: