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First locate the oxygen sensor.It is screwed into the exhaust pipe close to where the exhaust pipe is connected to your exhaust manifold.unplug the electrical connector.Unscrew the sensor snd remove it.Replace it by screwing in and tightening the new sensor and plug up the electrical connection. My 1999 4.8 liter silvarado has 4 oxygen sensors and they aren't cheap.Unless you are sure which one needs replacing,and I believe Chevy recommends changing both at the same time,I recommend you take it to a garage and let them connect their computer to it.This will tell them which ozygen sensor it is.You will pay a small diagnostic charge for this service but its a heck of a lot cheaper than replacing sensors till you get to the right one.Hope this helped.

2011-09-13 00:24:48
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