If you're under the car near the oil pan, sticking out of the top of the exhaust, toward the floor of the car, you'll see it. It's about the size of a Bic lighter and it has a couple wires coming out. Just use a wrench to remove. Undo the wires and replace, expensive tho.
The oxygen sensor on a 1988 Honda Prelude fuel injected engine is on the exhaust manifold. It screws directly onto the front of the exhaust manifold.
Oxygen sensor or lambda sensor is situated in the exhaust pipe in front of the catalyst. Disconnect from loom and unscrew with large spanner.
It depends on which version of Prelude (there were five generations) you are referring to.
How can I check the ENGINE COOLANT TEMPERATURE (ECT) sensor on my 1991 HONDA PRELUDE SI 2.1L
The cylinder position sensor is located in the distributor.
The IAT sensor on the 1993 Honda Prelude is located to the right of the intake manifold as you face the engine compartment. It is connected with red and green wiring.
under the distributor!
In the tank
The O2 sensor on a Honda Prelude is found on the exhaust pipes of the vehicle. They are located near the catalytic converter which is place on the underside of the chassis.
I,m not sure how to change it, but the brackets that held mine rusted and blew a hole in my exhaust. Hope this helps you locate it.
Behind the timing belt cover
Just below the intake manifold.