Twin Tec 02 bypass kit 4-wire TC12-UP For Harley-Davidson

These O2 sensor eliminator kits are used when you want your bike to run without O2 sensors for example when you want to change air/fuel ratio at idle and part throttle for racing applications They plug into the stock wiring harness to avoid that warning light coming up or fault codes appearing on your instruments. They simulate a cold sensor condition and cause the ECM to remain in "open-loop" operation. Sold in sets of 2.