What does an oil sending unit look like and where is it on a 1991 2.2 Chevy cavalier?

The oil sending unit on a 1991 Chevy Cavalier 2.2L engine is a small, cylindrical device, usually about 1-1.5 inches in diameter and a couple of inches long. It has one or two wires connected to it (one for the oil pressure gauge, possibly another for a warning light). It's typically made of metal (brass or steel are common). It doesn't have any visible moving parts; it's essentially a pressure sensor.

Location:

On a 1991 2.2L Chevy Cavalier, the oil pressure sending unit is usually located on the passenger side (right side) of the engine block, near the oil filter. It screws into the engine block. Because of its location near the oil filter, oil might be present, so be prepared for some mess when accessing it.

To be absolutely certain of its location:

1. Consult a repair manual: A Haynes or Chilton repair manual specific to your 1991 Chevy Cavalier 2.2L will have diagrams showing the exact location of the oil pressure sending unit. This is the most reliable method.

2. Look online: Search for "1991 Chevy Cavalier 2.2L engine diagram" or "1991 Chevy Cavalier 2.2L oil pressure sending unit location" on image search engines like Google Images. You'll find pictures of the engine bay that might show its location.

Important Note: Always disconnect the negative battery cable before working on any part of the electrical system of your car, including the oil pressure sending unit.