HertsMini

Hi all, just joined the forum and was wondering if any of you could help me understand some strange reading that I'm getting. Went for a drive with my Pscan plugged in recording the lambda sensor data on my MPI mini, was just looking at it and all seems ok bar these strange blips in voltage every couple of minutes. I've attached a photo to show you what I mean.

Is the sensor defective in some way? Can't really figure out why the voltage reading would be so high given the sensor is only meant to read about 1V at it's max. Any thoughts or advice would be much appreciated. Many thanks!