Detailed information

2025

How can oxygen sensor data be measured accurately? What challenges might arise during the measurement process?

For heated oxygen sensors, in addition to measuring the signal voltage, it’s also necessary to measure their heating resistance and heating voltage.

To accurately measure the oxygen sensor data, you’ll first need to prepare the right tools, such as a car-specific multimeter and an oscilloscope. Before starting the measurement, make sure the vehicle is in a safe condition—turn off the engine and allow it to cool down for a while to avoid burns from high temperatures. Next, locate the oxygen sensor, which is typically situated on the exhaust pipe; note that the exact placement may vary depending on the vehicle model.

When using a multimeter for measurement, select the appropriate method based on the oxygen sensor type—whether it’s heated or non-heated. For non-heated oxygen sensors, focus primarily on measuring the signal voltage. Connect the multimeter probes to the oxygen sensor’s signal output wire, start the engine, and allow it to operate under various conditions (e.g., idle, medium speed, high speed), observing the voltage changes displayed on the multimeter. Under normal circumstances, the oxygen sensor’s signal voltage should fluctuate between 0.1 and 0.9V with a relatively high frequency. If the voltage remains consistently at a fixed value or shows abnormal fluctuations, it could indicate a malfunction in the oxygen sensor.

For heated oxygen sensors, in addition to measuring the signal voltage, you also need to check their heating resistance and heating voltage. When using a multimeter to measure the heating resistance, connect the probes to the sensor’s heating pins—typically, a healthy heating resistance will range from a few ohms to around 10–20 ohms. To measure the heating voltage, once the engine is running, use the multimeter to check the voltage at the heating pin; this should closely match the vehicle’s battery voltage. For a more detailed analysis, an oscilloscope can provide a clearer view of the oxygen sensor’s signal waveform. Simply connect the oscilloscope probe to the sensor’s signal output wire, start the engine, and observe the waveform. A normal waveform should exhibit rapid fluctuations within a reasonable amplitude range. If the waveform appears abnormal—such as slow oscillations or irregular amplitude—it could indicate a potential issue with the oxygen sensor.

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