What are the symptoms of front and rear oxygen sensor failure?

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The symptoms of front and rear oxygen sensor failure are: 1. The engine experiences unstable idle, misfire, and surging; 2. It increases the exhaust pollution of the engine. The diagnostic methods for front and rear oxygen sensor failure are: 1. Warm up the engine to normal operating temperature; 2. Connect the negative probe of the multimeter's voltage range to E1 in the fault detection socket or the negative terminal of the battery, and the positive probe to the OX1 or OX2 socket in the fault detection socket or the output wire on the oxygen sensor harness connector; 3. Keep the engine running at 2500 rpm and check if the voltmeter needle swings between 0 and 1V, recording the number of swings in 10 seconds; 4. Check if the oxygen sensor is damaged; 5. Inspect the appearance color of the oxygen sensor.