Oven Code F3-E2 (Post sensor change)

My oven kept kicking off Error Code F3 E2 so I followed the post and tested the sensor (which was low) and replace it. I ran the oven again with the new sensor and an oven thermometer and all looked good until I used it for french fries at 450 and got the error again. I restarted it again with the same code within 5 minutes. I then moved the tray around and tried again and it finished.

What are the next things to look at and can there be an issue with the placement of the sensor that would give me different results based on where I put the food?

Thanks,

James