Originally Posted by mberndt
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
No, you are confused. There is a seperate sensor on the F23A4 that is called the
AIR/FUEL RATIO sensor by Honda when it calls all other sensors the Oxygen sensor. I understand what Oxygen sensors do (but thanks for reiterating exactly what I said to sound smart). It is a different part number and different from the other oxygen sensors Honda sells. It obviously must perform a different function and is the reason why his check engine light is on. He might as well have stuck a fork in the hole, the Bosch unit probably isn't helping the PCM because it's incompatible.
I liked how you contradicted yourself too..first you said the O2 sensor reads the oxygen, then you said it reads the air fuel ratio. It doesn't determine spark BTW, it just determines fuel injection.