2009 A4 TSI

David Giannandrea david.giannandrea at sbcglobal.net
Tue Jun 3 10:04:16 PDT 2014

The knock sensors are used to adjust the spark timing,
maybe other stuff too. This allows you to use crappy
gas...BUT DON'T. It isn't cost effective, check your
mileage to verify, use the best premium.

No visible engine codes. The 'knock' is sensed before
you will ever hear it as part of normal engine

So envious.

David G.

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