How to Solve Oxygen Sensor Problems?

[McAna]

Solutions for oxygen sensor problems: 1. Warm up the engine to normal operating temperature; 2. Connect the negative probe of the multimeter's voltage range to the E1 terminal in the fault detection socket or the negative terminal of the battery, and the positive probe to the OX1 or OX2 terminal in the fault detection socket, or to the output wire on the oxygen sensor harness connector; 3. Keep the engine running at around 2500 RPM and check if the voltmeter needle can swing back and forth between 0 and 1V. Record the number of times the voltmeter needle swings within 10 seconds. Under normal conditions, with feedback control in progress, the oxygen sensor's feedback voltage continuously fluctuates around 0.45V. If the number of swings is fewer than 8, it indicates that the oxygen sensor or feedback control system is not functioning properly. The reason is likely carbon buildup on the oxygen sensor surface, which reduces sensitivity. To address this, run the engine at 2500 RPM for about 2 minutes to remove the carbon deposits from the oxygen sensor surface.