The RF M18 Mini Cat (also known as a cat fooler, O2 spacer, or CEL eliminator) threads into the standard M18 x 1.5mm O2 sensor bung and moves the rear oxygen sensor away from the main exhaust flow. A small internal catalyst substrate processes the sampled gas, giving the ECU a ‘catalyst efficiency OK’ reading even on a decat or high-flow sports cat system.
Specifications
- Thread: M18 x 1.5mm (standard O2 sensor thread)
- Type: Mini cat / O2 sensor spacer
- Material: Stainless steel
Applications
Used whenever removing or upgrading a cat has triggered a P0420 or P0430 readiness code. Threads directly into the standard M18 x 1.5mm O2 sensor bung — no welding or ECU tuning required.
