[TehPriest]

I can purchase a three wire Zircona type sensors for very little money and fit my existing plugs onto them by soldering. Question is, are these the correct type. The thread size is 18mm and the spanner size is 22mm. It does state they will not replace “Titania” or “Planar” type Sensors. Full details below.

This is a 3 Wire universal sensor for a Petrol Engine. The best way to determine if it will fit your car is to count the number and colours of the wires on your existing sensor. Basically, if your existing sensor has the same number and colour of wires 2 White, 1 Black in this case, then you can be 95% certain that this sensor will do the job. For the more technically minded this is a Zircona type sensor (see below for explaination).The thread size is 18mm and the spanner size is 22mm. This sensor will not replace “Titania” or “Planar” type Sensors.

So am I onto a good thing here or not?

 

[p76rangie]

First off you should not solder wires on an O2 sensor. It gets its external reading by the small amount of air passing down the wire. The only difference between a 3 wire and 4 wire sensor is that a 3 wire earths out through the exhaust pipe and a 4 wire has a separate earth wire.

 

[95RRC]

With the 3 wire I believe there is a Black, Red and white....but in actual comparison to the plug wires that go to the ECU its a Red/White, Black and a thicker blueish black wire who goes to who ?

 

[drwhosc]

Tough one. These are narrow band sensors. a three wire system is one pos one ground, and one for heating element. I am not sure how pug and play many of these sensors are. the EC is expecting a pretty accurate reading. I have successfully soldered O2 sensors on my porsches. You will have to see what the individual wires do and what the ecu wants. Only one will actually go back to the ECU if it is like other cars, but hell this is a rover, nothing is like other cars... I do not have a wiring diagram since I am traveling, but that will tell you exactly what is what. You should also be able to look up replacements for the rover O2 sensor.

Since I have to replace mine as well, i do plan on having more specific info soon. Will love to hear what others have to say about this one.

 

[95RRC]

It is the correct sensor that I have. The three wires from the sensor to the plug end were pulled out due to a poor install. What I am trying to figure out is where to insert them in the plug end to match the non matching colors from the ECU plug end. Thanks for the response @drwhosc !

 

[drwhosc]

from the 95 wiring diagram..

From O2 Sensor

Black Is going back to the ECU. Left in Pin 23 Right in Pin 24

Red Looks like the power source for the heater and the sensor.

White Is going to ground

In the O2 sensor shield. What you described. There is a Blue wire that connects to the Black wire. this is the actual O2 sensor signal. The red wire connects to White/Orange wire which is coming off the fuel pump relay. It should have switched power. Cant tell but the ground wire from chassis to connection may be balck. It is not labeled well. That will go to your white O2 sensor.

Hope this helps...

 

[95RRC]

Thanks so much that definitely helped...thing is...now the ECU trips out and resets itself when driving. When this happens you can hear the fuel pump relay click out. Any thought Anyone ?