Where is the oil sending unit located on a 1995 Chevy S10 Blazer What problems can it cause?

On a 1995 Chevy S10 Blazer, the oil pressure sending unit is typically located on the driver's side of the engine block, near the oil filter. It's a relatively small unit, often with a single wire connector. The exact location might vary slightly depending on the engine (4.3L V6 or a different engine). Consult a repair manual specific to your Blazer's engine for the precise location.

Problems a faulty oil pressure sending unit can cause:

* Inaccurate or fluctuating oil pressure gauge reading: This is the most common problem. The gauge might read zero, even when there's sufficient oil pressure, or it might jump around erratically. This doesn't necessarily mean low oil pressure, just that the sending unit is malfunctioning.

* Check Engine Light (CEL): While not directly related to the gauge, a faulty sending unit can sometimes trigger a CEL due to the PCM (Powertrain Control Module) receiving erroneous data. The CEL code might refer to an oil pressure sensor fault.

Important Distinction: A faulty sending unit *only* affects the oil pressure gauge reading and potentially the CEL. It *does not* directly impact the actual oil pressure in the engine. Low oil pressure itself is a serious problem that can cause engine damage, but a faulty sending unit is simply a sensor problem. If your oil pressure gauge is showing low or no pressure, you still need to check your oil level and pressure *independently*, perhaps with a mechanical gauge, to confirm the actual oil pressure.