OXYGEN SENSOR LOCATION

Could someone please state the location of a oxygen sensor on my 1996 chevy pickup.It was scanned and it came up as : sensor one, bank one....It is a 4.3 litre, vin code "W"...I have traced the drivers
side- and I did find the one in the exhast just before it turns toward the passenger side to connect into the Y--- but there is a sensor,it seems a bit larger, in the drivers side manifold just before it connects into the exhast by the firewall???? What would that be??
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1st sensor you find in the drivers side exhaust pipe from the manifold.

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Are you going to replace it yourself. They are not too hard to do once you find it. Sometimes they come out hard but you do need a special socket with a slot in the side for the wires.

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