The O2 sensor adapter operates on the principle of deceiving the Engine Control Unit (ECU) into believing that the vehicle still possesses an exhaust catalyst. This is achieved by manipulating the oxygen sensor's perception, leading it to perceive the presence of a functional catalyst.

To install the O2 sensor adapter, you will need to remove the oxygen sensor and place the oxygen sensor spacer in its place. Then, screw the oxygen sensor back into the spacer. This will prevent the ECU from detecting that the catalyst has been removed.