Sealey-CCOS300-Oxygen-Sensor-Catalytic-Converter-Cleaner-300ml-Sealey-CCOS300-High-capacity-cleaner-designed-to-dissolve-dirt-varnish-&-carbon-residue-throughout-the-exhaust-system-The-primary-function-is-to-clean-the-oxygen-sensor-&-catalytic-converter-to-optimise-performance-Suitable-for-use-in-petrol-&-diesel-vehicles-Treats-60-80-litres-of-fuel-Sealey-CCOS300-Oxygen-Sensor-Catalytic-Converter-Cleaner-300ml