Your 1234yf machine or identifier should provide advance notice when the oxygen sensor is nearing the end of its lifespan. Oxygen sensor replacement is required to return machine to normal operation. If the oxygen sensor expires, neither the integrated identifier, nor the machine, is able to recover or add refrigerant to the internal tank.

Product Features:

• Fits: ROBAC1234-4, ROBAC1234-6 and ROBAC1234-9