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NISSAN Techs - How many oxygen sensors are there in a 2000 Infiniti G20?
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Holland     Reply with quote
Can you replace just one or do you have to replace all.
Dragon     Reply with quote
2. One pre cat and one post cat. You should be ok replacing the one that fails. Both only if the car has over 70k miles and they have never been replaced.
Cat     Reply with quote
there are two sensors 1 upstream o2 sensor and 1 downstream o2 the only time you might replace 2 o2 sensors if vehicle has tsb that instructs you to do so ..
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