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AFR discrepancy


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I have just had a g4+ extreme installed and am becoming familiar with the software. I have a PLX wideband installed and when dyno tuning found that the PLX gauge is ( + - 0.1) to the dyno used with a new 02 sensor;  However, when comparing the PLX gauge with the G4+ guage, the G4+ is about (+ 0.3 to 0.4 higher).  To be clear, when the PLX gauge shows 14.3 AFR  the G4+ says 14.6 to 14.7, generally.  I would conclude that the engine is running a little rich if it is following the AFR target table.

Your thoughts and solutions on this would be appreciated.

I look forward to your reply.

Best regards,


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Sounds like a slight scaling issue or a slight difference in ground potential.

You can adjust the scaling using a custom cal. I would only do this after having check all the grounds are at the same potential.

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