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I know there are at least (2) of them: BEFORE Catalyst AFTER Catalyst *Sold with or without connectors There are several brands Bosch - Denso - Replacement - SNG - Walker Products Improve Your Cars Engine Response, Gas Mileage And Lower Its Emissions When You Replace Its Tired Old Oxygen Sensor Will this really improve gas mileage? How do you know if the old one is bad, if the check engine light is not showing a problem? They recommend them at tuneups, but is this just a way to make more money?

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18y ago

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