Seafoam cleaner is available at your local auto part store. Allow the O2 sensor to sit in the cleaner overnight. This will allow the cleaner to penetrate and break up any remaining deposits. The sensor is now cleaned and ready to be reinstalled.Click to see full answer. Subsequently, one may also ask, is seafoam safe for o2 sensors?Many use seafoam with no real issues and it’s been around for years both before and after the advent of O2 sensors. It’s basically naptha and sweet oil which aren’t going to do as much damage to the O2 sensor in the big scheme.One may also ask, can seafoam ruin your engine? Sea Foam Motor Treatment only contains organic petroleum ingredients. It does NOT have harsh detergent or abrasive chemicals that can harm your engine or fuel system components. Sea Foam can be added safely and effectively to: any make or type of Gasoline or Diesel Engine. Similarly, you may ask, can you clean o2 sensors? Cleaning O2 Sensor/Catalytic Converter. There are no true oxygen sensor cleaners that are safe to put through your engine. While some people choose to remove them and use a wire brush or an aerosol cleaner to remove deposits, we do not recommend trying to clean O2 sensors.What is the fastest way to clean an o2 sensor?Before you can clean an oxygen sensor, you have to remove it from the exhaust manifold. To make this easier, spray the sensor with WD40 and let it sit for 15 minutes. Once the sensor is loose, unscrew it and let it soak in a container of gasoline for at least 8 hours.