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Q: will changing muffler activate o2 sensor error and turn on serv eng light on 2000 Nissan Maxima

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Getting service engine light activated by o2 sensor after muffler and exhaust pipe was changed
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it shouldn't, unless using modified part it might. bigger exhaust allows different air flow than stock model. sensor programmed for stock model. are the cats. still original. possible they may be clogging a bit. try clean fuel system . ethanol treatment to 1 tank of premium fuel. build up in fuel system, combustion chambers and exhaust can trip your sensors also.
may want to get diagnostic run to find any issues u should be aware of.
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