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p0420 covers?

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so if this code pops up and im still under the 7yr 70k mi warranty does this cover just the cats or does it also cover the o2 sensors? I dont really wanna go to the dealer to have them tell me to replace an o2 sensor and then charge me to tell me that. I can crawl under the car and replace those myself easy enough.


Or should i just bite the bullet and get a new rear o2 sensor and hope that keeps the p0420 code from popping back up.

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