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AEM X-Series OBDII Wideband UEGO AFR Sensor Controller Gauge ZERO_PRICE Invidia 14-15 Honda Civic SiManufacturer Part # : 30 0334 Associated Comments Accurate AFR data is critical when tuning an engine. Running rich (very low air fuel ratio, excessive fuel) can cause a loss in power, while running too lean (very high air fuel ratio, not enough fuel) may result in serious engine damage. Using a wideband air fuel controller during the tuning process allows you to monitor AFR and adjust tuning parameters to optimize them for maximum power and