Originally Posted by 98CoupeV6
Kind of. The O2 sensor controls how much fuel is injected into the cylinders, but on the F23A4 there is what Honda calls an 'A/F sensor' on the exhaust manifold that controls the A/F ratio differently and makes sure it is correct for emissions purposes. They're a little different, which is why Honda calls them by different names. But yeah, the terms are generally interchangeable and on everything except the F23A4 it's an O2 sensor. Observe:
You are confused...
In Pre-OBD and OBD-1 cars, 1 oxygen sensor is present, before the catalytic converter, and in OBD-2 and later cars, there are 2 sensors, 1 before and 1 after the cat.
All computerized engine management systems use an Oxygen sensor to detect the amount of oxygen in the exhaust stream, and then use the value of the resistance to determine the proper fuel and ignition timing.
An O2 Sensor is exactly what it says it is, there are no differences...
An A/F ratio is what is being read off of the O2 sensor, it determines the correct mixture of spark and fuel to supply to the engine.
The words are interchangeable no matter what company they come from...
Later