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their is a special socket made for o2 sensor removal and installation. their is a slit down one side so that the wire can come out. purchase that socket, raise vehicle safely, climb under, spray with penetrating catalyst, may need to heat up a little bit, unscrew old one, replace with new one, plug in, start the car.

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Q: How to replace oxygen sensor on a 1992 Cadillac sedan deville 4.9?
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