Is Cleaning the Car Oxygen Sensor Useful?
2 Answers
Whether cleaning the car oxygen sensor is useful depends on the situation. If the tip of the oxygen sensor is black (mainly due to carbon deposits), cleaning can be very effective. However, if the tip is white or brown, it indicates that the oxygen sensor is poisoned (the former is silicon poisoning, and the latter is lead poisoning). Regardless of the type of poisoning, cleaning will not help, and the sensor should be replaced promptly. Note: Here, cleaning does not mean simply rinsing with water, as this has little effect. The oxygen sensor should be soaked in a 5-10% ferric chloride hydrochloric acid solution for about 10-15 minutes before being rinsed with clean water. After cleaning, ensure that the four surrounding holes are clear. Additionally, observe the bottom of the oxygen sensor. If the internal carrier appears white after cleaning, the oxygen sensor has essentially regained its activity.
I've also tried cleaning the oxygen sensor before when my car suddenly had increased fuel consumption and the check engine light came on. A friend suggested the sensor might be dirty. I removed it myself and soaked it in a specialized cleaner – indeed, a lot of copper-colored carbon deposits were cleaned off. After reinstalling, the check engine light went out, and fuel consumption returned to normal for two or three months. However, the good times didn't last long; the problem started again after half a year, and this time I completely replaced it with a new sensor. My experience is: surface oil stains and carbon deposits might temporarily improve things when cleaned, but if the internal ceramic element is aged or lead-poisoned, no miracle solution can bring it back. It's like waxing a vintage car – the exterior shines, but the engine still needs repairs. Sensors are designed to be precise, and acid cleaning might even corrode the protective layer. It's better to replace them early for peace of mind.
