Where is oxygen sensor on a 1988 2.9 liter Ford engine?

The location of the oxygen sensor (O2 sensor) on a 1988 Ford 2.9L engine can vary slightly depending on the specific vehicle model (e.g., Ranger, Bronco II, Aerostar). However, it's almost always located in the exhaust manifold or the exhaust pipe very close to the exhaust manifold.

To find it precisely, you'll need to:

1. Consult a repair manual: A Haynes or Chilton manual specific to your 1988 Ford vehicle with the 2.9L engine will show you a diagram with the exact location. This is the most reliable method.

2. Look underneath the vehicle: The sensor is usually threaded into the exhaust system. It's a relatively small cylindrical component with a single wire harness connector. You'll likely need to use a jack and jack stands for safe access.

3. Trace the wiring: The oxygen sensor wire will run from the sensor to the engine's computer (ECU). Following the wire from the connector might lead you to the sensor itself.

Important Safety Note: Exhaust systems get very hot. Allow the engine to cool completely before attempting to locate or replace the oxygen sensor. Wear appropriate safety gear, including gloves.