I'm pretty sure the "OEM O2 Sensor" off the top of my head its like this.......
2 Black cables: 02 sensor heater + & -
White cable: 02 signal wire to ECU
Blue cable: 02 sensor earth wire
Seeing your looking at a red wire I'm not completely sure how yours is going to work, was it supplied with any kind of schematic?? If not, what the Brand and Part # and I'll see what I can dig up.
Also if your instantly looking for a signal, you wont see it as the heater has to do it bit first IINM.....
It probably will produce some form of signal, but it wouldn't be reliable. My understanding is that often the ECU will watch for a specific resistance from the sensor to tell when it is heated, and only start using it then.
Hard to say for certain without actually looking at the ECU code though!
Ok peoples im slowly getting somewhere, yes im getting signal from the blue wire which is white on the cars plug but on the air/fuel gauge im trying to hook up it showing lean, rich, lean, rich, lean, rich....... constantly.
What am I doing wrong? should I get the signal from the ECU?
CAR 02 SENSOR
black black
red black
black white
white blue
I already told you that the "unstable" signal you are getting is perfectly normal for closed loop running of the car. What you are seeing is that the AFR is actually going rich, lean, rich, lean etc.
Another problem you have is that a narrow band O2 sensor is only really able to tell you that the AFR is 14.7:1. The rest of the time, while it knows richer or leaner, it doesn't know by how much.
In that regard, monitoring it is largely pointless. If you want to monitor your AFR, get a wideband O2 controller and sensor. Fortunately most of those have a narrow band simulated output which you can use to replace your standard sensor.