Q: How does an O2 Spacer work? The ECU uses the after-cat O2 sensors to determine proper operation of the emissions control system, however, when the catalysts are are removed, or exchanged with high flow cats for racing, the ECU will read this and indicate a "Check Engine" light and corresponding error code. To keep this from happening, our O2 Simulators emulate correct functionality of standard rear O2 Sensors by showing them less emissions by moving them away from the exhaust stream; similar to what they would see if the factory catalyst was in place and keeping proper ECU function and engine operation. THIS IS FOR OFF-ROAD USE ONLY. Not legal for use on street cars.
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