2009 A4 TSI

John Lagnese jlagnese at massed.net
Wed Jun 4 21:45:31 PDT 2014

Agreed, my 16V Scirocco gets more power and better mileage with premium gas.

David Giannandrea <david.giannandrea at sbcglobal.net> wrote:

>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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