When I first installed my extended O2 sensors on my CNT test pipes I angled them downward not knowing I could move the nut and angle them upward, so I ended up scraping them and severing a wire resulting in a
persistent CEL light. Took that sucker off today, cut through the metal. pulled out the wire and soldered it back together. No more pointless CEL light or expensive O2 sensor replacement.
Angles were fixed a while ago.