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wyldkarma

Scan Gauge II MPG drop

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My scan gauge II has worked great for the last few years.  My first scan gauge lasted 7 yrs, now on my second one.  While driving It would readout around 60 - 65 mpg (US).  When I coast down a hill or up to a traffic light it reads 9999.99  This week my scan gauge show I get only 6.4 mpg and when I coast it reads 9.7.  I have no error codes that pop up, power seems the same, Is my scan gauge on the fritz, has some gauge setting been altered, or has something happened to my engine that drastically lower my mpg?  Power, shifting, rpms all seem unchanged.  I am baffled as to what happened, any ideas?   Thanks!

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Try resetting it.  It sounds as though it was disconnected.  Start from the beginning as per the manual.

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Thanks Mike T, that was the issue.  Had the scan gauge so long, forgot it needed to be re-programmed.  Works like a charm now.

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