Where is the oxygen sensor located on a 1987 Chevy 1500 truck?

The oxygen sensor location on a 1987 Chevy 1500 truck depends on the engine. There's no single answer. It's most likely located in the exhaust manifold or in the exhaust pipe very close to the manifold.

To find it, you'll need to:

1. Identify your engine: Look for an engine code on a sticker under the hood (often near the radiator support). This code (e.g., 305, 350, etc.) will help you find a diagram.

2. Consult a repair manual: A Haynes or Chilton repair manual specific to your 1987 Chevy 1500 and engine will show the exact location of the oxygen sensor(s). These manuals usually have detailed diagrams.

3. Look online: Websites like AutoZone, Advance Auto Parts, or Napa Auto Parts allow you to enter your vehicle information (year, make, model, engine) and see diagrams showing parts, including the oxygen sensor location.

Without knowing the specific engine, I cannot give you a precise location. Be cautious when looking for the sensor as the exhaust system will be hot after the engine has been running.