http://wiki.answers.com/Q/Where_is_the_O2_sensor_on_a_2000_buick_lesabre"
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O2 sensors are located on the exhaust manifold, the exhaust pipes, or both. Sensor is located on the exaust pipe in front of the fire wall. RV
On a 2001 Buick LeSabre, there are typically two oxygen (O2) sensors. The upstream O2 sensor is located before the catalytic converter, attached to the exhaust manifold, while the downstream O2 sensor is positioned after the catalytic converter in the exhaust system. These sensors monitor the exhaust gases to help optimize fuel efficiency and emissions. To access them, you'll need to lift the vehicle and may require special tools due to their location.
A bad o2 sensor can cause this problem in a car. A bad fuel pump, fuel filter or fuel line will also cause hesitation during acceleration.
Usually it is the O2 sensor
1st o2 senor is between exhaust. 2nd o2 sensor is under shifter
Remove the vacuum hose from the O2 sensor. Remove the wiring harness. Remove the O2 sensor retaining screws. Reverse the process to install the new O2 sensor.
O2 sensor? Hey its a part and parts wear out. Oil additives or fuel additives can ruin an O2 sensor as well.
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
See related link which includes instructions for testing any O2 sensor.
The 2000 Mazda Miata O2 sensor bank 1 is located on the firewall in the engine compartment. The sensor can be found on the passenger side of the firewall.
All O2 sensors are screwed into the exhaust system.