Hondata

has anyone had to use the voltage offset with a plx wideband plugged into the hondata s300?

Yes, this is used for all widebands.

i wasasking as I have the plx wideband but without the gauge as its plugged straight into the s300 so was wondering if the afr are correct as they said it was self calibrationg

Without having a gauge there is no way to make sure that the value you are datalogging is acruate with what the wideband is reading. You may be able to use a multimeter to get the output voltage and then calcualte the AF and compare it, but that does require equipment and conversions.

thanks