You need an O2 sensor socket, then unscrew from pipe/manifold. the socket is fairly universal. Unplug elec connector first then have at it. Having a propane torch and water supply handy may help-many use heat to loosen them up.
The 2001 Buick LeSabre is equipped with two oxygen sensors: one located before the catalytic converter (upstream) and one after it (downstream). These sensors help monitor the vehicle's exhaust emissions and fuel efficiency. If you're experiencing issues with the oxygen sensors, it's advisable to have them checked for proper functioning.
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Check www.autozone.com, they have a Repair Info section that covers Buick LeSabre with this info.
what actuator?
Usally on the rear manifold rear top of engine. You should be able to see the sensor wire from the brain box going out to it.
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How do you replace fuel filter on 1993 Buick LeSabre, the replacement filter I bought appears to be a snap on. I have only replaced the screw on type.