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it has three 02 sencers
When I had that problem on my 1997 buick lesabre, I had to replace the catalyst converter and the 02 sensor on it. It resolved the issue with the code.
There are a total of 4 02 sensors on an 2001 grandprix gtp with a supercharger 3.8 liter v6 engine
There are two O2 sensors for the 01 QX4. One in front of the catalytic converter and other is behind the converter.
There are four 02 sensors. Two in the Y pipe just before the first set of cats. Then a second set of sensors just before the last set of cats.
Most oxygen sensors are heated oxygen sensors.
The 02 sensors are in the exhaust pipes but don't know about the updraft sensors.
replace them both, if u reset n sends bad code replace otherone 4 real or go 2 a shop n spend 74 - 100 4 diagnostic
There are 2 upstream 02 sensors just behind the exhaust manifolds, threaded into the exhaust pipes, one on each side. There are 2 downstream 02 sensors just behind the catalytic converters, one on each side as well.
The vehicles computer relies on the information from the 02 sensors and other sensors to adjust the engine for peak performance.
The o2 sensors screw in. There is a special socket for removing the 02 sensors with a slot in the side to clear the wiring.