front lower left of timing case cover around oil pan and engine block meet facing firewall
In the exhaust pipe
The 1990 Buick LeSabre oxygen sensor is located on the outside of the air cleaner housing. The oxygen sensor will be on the back side of the housing.
PFM
That should be the Oxygen Sensor
Crank shaft sensor need replaced or cam shaft sensor
The oil pressure sending unit on a 1997 Buick LeSabre is located on the bottom side of the engine, near the oil filter. It monitors oil pressure to ensure that the pump is working properly.
The battery is located under the rear seat cushion on your 2001 Buick Lesabre.
Under the back seat
In the glove box.?
On front cover of engine, slightly above crankshaft pulley.
i believe so
The fuel pump is inside the fuel tank.