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I have a 1997 Mercury Villager with many miles. We get poor gas mileage. The check engine light is on. I want to replace the 02 sensor but cannot locate it on the engine. Is there a link with photo of physical location of the sensor and what are the steps to replace it?
Try this first.Take off the distributor cap and rotor button,Then remove the 2 screws holding the cover on under this. You will then see a sensor and a wheel with a bunch of slots in the end of the wheel this is the ignition photo cell.You will probably see a black film built up on it.Clean this with electrical cleaner then blow dry or let it totally air dry before putting it back together. This usually solves the concern you have.