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it is located on top of the engine on the drivers side. It has a connector and a vacume plastic hose hooked to it. Very easy to get too.It has a lot to do with fuel delivery if it is not working because it tells the computer at what altitude the vehicle is operating, the computer uses this info to control the amount of fuel that the fuel injectors are putting into the engine.If it is working correctly it should have about 3 volts on the side going back to the computer. Most cars made after 1996 have a MAF (meter) sensor instead, which does the same thing sensing the amount of air that is entering the engine through the air filter hose located right after the air filter.When it gets dirty it quits working and it can be removed and cleaned. When it does not work people seem to think that the reason their is a lean or rich code on the computer it is automatically the 02 sensor. Not so as autozone tells people.It most likely is a dirty MAF air flow meter not reporting to the ECM (eloctronic control module)which controlls fuel delivery.
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