What is the method for cleaning an oxygen sensor?

1 Answers
LeBrady
07/30/25 10:43am
For oxygen sensors that are not severely dirty, carburetor cleaner can be used for cleaning. For those with heavy dirt, a solution of sulfuric acid diluted with ferric chloride can be used. Below are the specific cleaning steps: 1. Remove the oxygen sensor and soak it in a solution of 5-10% ferric chloride with excess hydrochloric acid. The exact ratio should be adjusted based on the condition of the sensor's surface. Soak the oxygen sensor in the solution for 10-15 minutes, then remove and rinse thoroughly with water. Ensure that the four surrounding holes are clear, and when viewed from the bottom, the internal carrier should appear white after cleaning. 2. If the cleaning is not satisfactory, repeat the process until the white carrier becomes visible. Alternatively, you can take the sensor directly to a 4S shop or a professional auto repair shop and have a technician clean it for you.
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