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on the muffler

Yes, there is also the pre cat O2 Sensor which is conveniently located about 6 inches behind the latch to open the hood in the center.

On the 2000 model G20 there is the one in the front on top of your exhaust manifold. It is a three prong sensor

Then there is another four prong sensor right after the exhaust manifold meets the exhaust pipe. Close to the engine. I was told by an Inifiniti mechanic that there are only two on this type of car and indeed there are only two.

I was told by another place that there were four sensors on this car but they were wrong. I know because I ony found two and changed them myself.

When you do change the sensors go to your local auto parts store and have them use an OBD2 device to clear your service engine light and drive the car about 30 miles on the hiway if you can. This will reset your sevice engine light and you are good to go.

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