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Wow...really? First of all which oxygen sensor are you wanting to replace? Secondly why are you replacing it, its only been 6 years. Anyway this is the way to do it.

Rent an oxygen sensor removal tool from an autoparts store for a 50 deposit. Or find a good crescent wrench to take it off. If its rusted on there your going to need a torch to heat up the sensor for easier removal.

Most important thing of all is though. Are you getting a direct plug in or a universal?

Diret plug is bout $150 (easy plug in like 'yoru old one)

Universal is bout $50 (you have to cut and rewire the 4 wires)

Process...

Find the sensor

Take your torch and heat up the sensor directly with the fire

Take your wrench set it over the sensor and unscrew it

Unplug or cut wire...whatever you chose

Replace...sensor and...make sure wires are soldered back or pluged in

Congrats your done. Hopefully you did it right and didn't have a check engine light!

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Q: How do you replace the o2 sensor on a 2003 Chevy impala?
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