Oxygen (O2) Sensor Is Shot - How Do I Confirm It?

[v8 eater]

hi guys,

I ran a test to see what errors were prompting the check engine light and found "code 33: O2 sensor"

heres a pic of what it said on the laptop [see below]

now i can monitor specific sensor readings and see if its shot dead or still alive but i dont know what it must be reading in the first place so any help would be good..

I removed the error code and it didnt come back yet so not sure what to do .. i wanna check but dont know how to read the figures to tell whats going on

thanks in advance

[MrStabby]

If the ECU is performing closed loop control (which is when the o2 sensor is being used to trim the fuel delivery) the reading should flick back and forth. If that program displays the value as a gauge then the needle should flick back and forward a couple of times a second.

To be in closed loop the engine needs to be up to temperature and at low throttle. I cant remember if its runs closed loop at idle - you might need to get a mate to watch ECUtalk while you're cruising.

EDIT: the sensor might be disconnected/wiring broken. I don't think the ECU can tell if its just tired/worn out.

[mad082]

when you load up the graphs, etc, then you should be able to see the o2 sensor data. if the sensor is working then it should flick back and forth between rich and lean

[mad082]

If the ECU is performing closed loop control (which is when the o2 sensor is being used to trim the fuel delivery) the reading should flick back and forth. If that program displays the value as a gauge then the needle should flick back and forward a couple of times a second.

To be in closed loop the engine needs to be up to temperature and at low throttle. I cant remember if its runs closed loop at idle - you might need to get a mate to watch ECUtalk while you're cruising.

EDIT: the sensor might be disconnected/wiring broken. I don't think the ECU can tell if its just tired/worn out.

you can just hold the revs at about 2500rpm in neutral and should flicker. otherwise just tap the throttle and it should go rich as the revs pick up and then lean as they drop back down