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oxygen sensors are basically emissions usally located on and by ur exaust usually by ur muffler they will stick out u can find them it will be a sensor that sticks out bout an inch an it will have a wire coming off the top find them and find how many you have and start changing them either all or one at a time

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Q: Your service engine light on your 2003 Diamante came on and was told it was the oxygen sensor What is this?
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