O2 Oxygen Sensor 52mm Air Fuel Ratio Gauge for Hyundai Accent Kia Rio Item Details A Digital VoltDigital LED Air Fuel Ratio GaugeAFR Readout Between 20 10 AFRVolt Reads Between 8 16VBlue Digital Read outSmoke LensFit 12V gas oil CarsNOTE 1 When powered on digital gauge will read the voltage for 1 minute and switch to Air Fuel Ratio 2 It will only switch back to voltage if there is a decrease or increase B O2 Oxygen Sensor Placement on Vehicle FrontPart Number 3921022610 39210 22610 39210 22610Fitment for Hyundai Accent 1999 2010 for Kia Rio 2005 2011 for Kia Rio 5 2006 2011NOTE The output voltage of this O2 Oxygen sensor is only two 0 1V and 0 9V so it only can show the working status LEAN andRICH the digital display of this air fuel ratio gauge will only can show the number like 19 or 11 Represents the workingstatus is LEAN orRICH Package Include 2 Options 1 x 52mm Air Fuel AFR GaugeOR1 x Front O2 Oxygen Sensor