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How to Detect Oxygen Sensor Signals?

2 Answers

DiHolden

07/24/25 10:35am

Methods for detecting oxygen sensor signals include: 1. Multimeter Voltage Measurement Method: Maintain the engine speed at around 2500 rpm for about 90 seconds, then use a multimeter to measure the voltage at the oxygen sensor signal output terminal; 2. Oxygen Sensor Tester Method: Determine whether the oxygen sensor is in normal working condition by observing the flashing and extinguishing of the indicator light on the oxygen sensor tester; 3. Multimeter Resistance Measurement Method: Utilize the resistance characteristics of the oxygen sensor to measure its resistance values in both warmed-up and non-warmed-up states to determine if it is damaged. The oxygen sensor is a critical feedback sensor in the electronic fuel injection engine control system, playing a key role in controlling vehicle exhaust emissions, reducing environmental pollution caused by vehicles, and improving the fuel combustion quality of the car engine.

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VanStephanie

08/11/25 5:39am

To check the oxygen sensor signal, let me start with simple methods. As an average car owner, when I had abnormal fuel consumption last time, I used an OBD-II scanner plugged into the diagnostic port to read trouble codes like P0130 or P0171; if the voltage signal is stuck at 0.45 volts or shows no variation, it indicates a faulty sensor. Without tools, try observing if the engine shakes after cold starts or if there's black smoke from the exhaust, as these may be signs of signal abnormalities. Another tip is to regularly clean the sensor to prevent carbon buildup and clogging, making it last longer. Safety reminder: Wear insulated gloves during inspection to avoid electric shock; signal issues can affect the air-fuel ratio, and prolonged poor fuel efficiency may damage the catalytic converter, so address it early. I personally check mine every six months for peace of mind.

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