Assuming this is the 4.3L engine, one.
TWO.
three
A 1998 Chevy S10 Blazer has a total of two oxygen sensors. One is used for the upstream and one for the downstream.
The 6.0L has 2 knock sensors and there both underneith the intake manifold. You can not see are get to them until you remove the intake.
2, bank1 and bank2
The 2001 Chevrolet Suburban is equipped with one knock sensor. The knock sensor will be attached to the back of the engine.
how many oxygen cencors does the 1994 Chevy blazer have
It depends on what year, some had one and some had two.
It has 2 and both of them are underneith the intake manifold.
2
one
There are 2 knock sensors on these motors. They are located in the valley cover under the intake manifold.