Randolph <trash@junkmail.com> writes:

> I recently replaced my O2S as well, and found the same price variations
> you found. The sensors I got quoted fell in three categories:
>
> Honda original Expensive
> Bosch replacement with Honda type connector Moderate
> Bosch replacement with generic connector Cheap ($70)
>
> I do not know how smart the ECU is. My O2S has 4 wires, two for the
> heater and two for the sensor itself. On mine the heater broke (not the
> sensor), and it is simple for the ECU to detect this break. I do not
> know if it can detect a failed sensor.

I believe that the sensor has an on/off characteristic: any variation
of the oxygen content from ideal sends the sensor into saturation. I
think most ECU's do a sanity check: if the sensor never changes state,
especially with wide variations in mixture, they flag an error.

<snip>

--
-Stephen H. Westin
Any information or opinions in this message are mine: they do not
represent the position of Cornell University or any of its sponsors.