1999 Nissan Stagea Rs4S O2 Sensor

[99RS4]

Het guys,

I have done a search and cant seem to find the info I am after, basically what I want to know is why the CEL on my car doesnt come on when I disconnect the Oxygen Sensor, left it idling for about 20mins....nothing.

Then I left it disconnect for 2 days with the plug cable tied up out the way....... done 70kms and still nothing.

No Check Engine Light or popping or misfires.

If anything the car seemed to pull harder on boost.

I have since replaced the O2 Sensor with the Ford EL Falcon one with the plug swapped over. Done another 30kms with this one in and a good 20mins of idle as well. Havent tried disconnecting but I will tomorrow.

Is there any way to prove its working ?

Someone has told me if the temp sensor isnt reading correct the car wont put the O2 sensor in the correct mode ( open or closed loop I can never remember ) I have the needle sitting just under half on the dash and it never moves. Can someone post a photo of the sensor that needs to be removed and cleaned/replaced ? If replacement is the only option maybe a part number ??

Thanks guys

Brendan

[Ben C34]

The temp sensor to check is the one with 2 wires going to it. That's for the ecu. The one with one wore is for the gauge.

I wouldn't expect a car to pop or misfire with a disconnected O2 sensor. It trims the fuel delivery slightly. It's not crucial.

As for why there's no error. Don't know.

Why does that bother you?

Idling isn't a very technical or worthwhile thing to do to see if the O2 sensor is working.

The normal and accurate way would be to get a wideband and actually check the mixtures are stoich at cruise and idle.

[Ben C34]

Actually a reason why the check light doesn't come on is that it's not a critical sensor for the ecu. It would likely log the code but it's not cel worthy.