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Collecting data under normal driving conditions with a Twinscan ll . Stock sensors in place ( not Twinscan wego sensors. When reading graph the AFR for the rear cylinder is jumping all over the place - spiking up + down from the command afr 13.1 to 14.5. The front cylinder is pretty level. What would be some of the likely causes.

06 Dyna - 113 SE build
 

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One last nag, and probably one of the most important, the pipe, thanks
OH BTW first thing to check, swap the sensors and see if the front is now erratic
 

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The rear 02 sensor plug in is under the seat next to the battery and the front one is inside the plastic guard right above the regulator.
 
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