The PO2 for one of the O2 cells on the Predator fluctuates. What should I do?

1. Test the O2 cell by moving it to a different connector on the O2 wiring harness to see if the problem follows the O2 cell. That will tell you if the misreading you are seeing is from the O2 cell or the wiring harness.
2. Return to your local Hollis CCR dealer to replace the damaged product for warranty/non-warranty