The oxygen sensor of your car measures the amount of oxygen in the exhaust gasses that exit the engine. It sends real-time data about the amount of unburnt oxygen in the exhaust system to the engine's computer to determine the correct air-to-fuel ratio for the car's engine.
how to check 4pin o2 sensor wiring ?
1.sensor signal 2.sensor ground 3.heater circuit power 4.heater circuit ground
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