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 using Diag4Bike, Daytona Twin Tec Twin Tuners in conjunction with a Daytona Twin Scan Tool, Dynojet Power Commander, Screamin' Eagle Pro Super Tuner and similar. The eliminators plug into the stock wiring harness and simulate a cold sensor condition, causing the ECM to remain in "open-loop" operation. Eliminators for 4-wire heated sensors can also be used to eliminate the secondary O2 sensors on Euro-5 motorcycles but then their only function is to keep moisture and dirt out of the wiring side connectors to keep them intact for later use.