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Trouble code P1931

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Engineblow1

Probationary Member
14
0
Aug 21, 2004
Spartanburg, South Carolina
I used a scan tool and got code P1931. I searched on here but the list I found don't have it listed. Neither did the book we have at work with OBDII codes. I checked it twice to make sure it came up the same. Anyone have a clue what this code means?

Thanks.
 
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