Where is the o2 sensor on a 1987 Ford Taurus lx wagon?

The location of the O2 sensor on a 1987 Ford Taurus LX wagon isn't standardized across all engines. There was more than one engine option available for that year and model.

To find it, you need to consult a repair manual specific to your car's engine. The manual will show you a diagram of the exhaust system and clearly pinpoint the location of the O2 sensor(s). The sensor is usually located in the exhaust manifold or in the exhaust pipe close to the manifold. It's typically wired to a connector.

You can find these repair manuals online (often as PDFs), at auto parts stores (like AutoZone, Advance Auto Parts, or Napa), or at libraries. Make sure you know your engine size (e.g., 2.8L V6, 3.0L V6, 3.8L V6) to find the correct manual.