That should be the Oxygen Sensor
The IAT sensor is located on the intake manifold air cleaning housing or air duct.
on the left side of intake manifold under MAP sensor.
Passenger side of black plastic intake plenum.
On a 1993 Buick Regal 3.1L, the PCV valve is located on the intake manifold. It is situated underneath the MAP sensor.
What's wrong with it?
The 1997 Buick LeSabre intake manifold bolt torque specifications is 45 pounds per square inch. The manifold bolts should be torqued in 15 pound intervals.
replace the water heater inlet pipe on the intake manifold on a 3800
It is mounted to the lower intake manifold just below the thermostat housing. It has a connector with two wired connected to it.
The 1997 Buick LeSabre mass airflow sensor is located on the outside of the air intake housing. The sensor can be found on the right hand side of the air intake housing.
18436572, should be stamped on factory intake manifold
You didnt list the year model. But many are located just below the throttle body at pass side of intake manifold. Sorry folks. should have said DRIVERS side of intake.
The intake manifold, head, and exhaust manifold must be removed to gain access to the gasket.