Where is the O2 sensor on a 1989 Chevy Celebrity?

The O2 sensor location on a 1989 Chevy Celebrity depends slightly on the engine. There's usually only one O2 sensor on these models. It's most commonly found in the exhaust manifold, downstream of the catalytic converter. However, to be certain, you need to:

1. Consult your owner's manual: This is the best source for the exact location on your specific vehicle.

2. Check a repair manual: A Haynes or Chilton manual for your year and model Celebrity will have diagrams showing the sensor's location.

3. Look under the vehicle: With the engine cool, carefully inspect the exhaust system from underneath. Look for a wire leading to a sensor screwed into the exhaust pipe or manifold. It's usually a threaded sensor, about the size of your thumb.

Warning: The exhaust system gets extremely hot. Always allow the engine to cool completely before attempting any work under the vehicle.

Without knowing the precise engine (2.5L, 2.8L, etc.), a more precise answer isn't possible. The above steps are your best bet for locating the sensor.