When the front oxygen sensor of a car malfunctions, it needs to be inspected and repaired. Here are some methods to deal with the malfunction of the front oxygen sensor:

1. Check the wiring connection of the oxygen sensor: Firstly, it is necessary to check whether the wiring connection of the front oxygen sensor is normal. If the circuit becomes loose or damaged, it needs to be repaired or replaced.

2. Cleaning the sensor: Sometimes, the malfunction of the front oxygen sensor is caused by carbon buildup or dirt. In this case, cleaning agents or ultrasonic cleaning equipment can be used to clean the sensor and restore its normal function.

3. Check the heater of the sensor: If the heater of the front oxygen sensor is damaged, it can also cause the sensor to malfunction. It is necessary to check whether the resistance value of the heater is normal. If it is abnormal, the heater needs to be replaced.

4. Check the feedback voltage of the oxygen sensor: The front oxygen sensor will normally output a feedback voltage, which should be within the specified range. If the feedback voltage is abnormal, it may be due to a malfunction in the sensor itself. The sensor needs to be replaced.

5. Check the engine control unit: If none of the above methods solve the problem, it may be due to a malfunction in the engine control unit. It is necessary to inspect and repair the engine control unit.

In short, the malfunction of the oxygen sensor before handling requires careful inspection and judgment, and corresponding handling methods should be taken according to the specific situation. If you are unsure how to handle it, it is recommended to seek the help of professional maintenance personnel.