[carlreeve]

Hi, just checked my o2 voltage on the PFC and they both read 3.4 volts when cold.
Once the car (R32 GTR) warms up they both read around 1.3-1.6 on idle.
Having spent around 20mins reading past posts the voltage shoud read between 0-1v.
They have 3 wires coming from them so I dont think they are anything special but cant understand why they are reading voltage so high (outside the operating range).
Has anyone any ideas as to why?


(I know I can disable the o2 in the PFC but is it worth while buying new probes for fuel economy ?)

 

[SimonM]

The R32 uses a Titania Oxygen sensor, these are different to the Zirconia sensors used in later cars. The zirconia sensors have an output voltage of between 0 and 1 volts.

From what you say, it sounds like the O2 sensors are working, as long as when the engine is warm and the revs are above about 2000 rpm you can see the voltage rise and fall then you know that the ecu is running in closed loop mode.