Im looking to change my o2 sensor and rang the motor factor to see if they had one in stock.They asked me if there is 2,3 or 4 wires coming out of it??
Could anybody tell me??
Im supposed to be working so havnt really time to be looking under my car or go browsing through the search option.So if anyone can tell me off the top of there head it would be brilliant
Thanks in advance

 

It has 4 wires in the plug ..
2 for the sensor, 2 for the pre-heater.

But I'm not sure if that counts as a "4 wire" sensor (or a 2 wire, with heater).

 

It's a 4 wire Zirconia.

Cats Direct are your best bet.

You will need to chop the connector plug from your old lambda and connect to your new one, if you are going for a non OEM sensor.

The wires don't solder either so be careful how you connect them (insulation etc)

 

There are two O2 sensors on the S. The primary that goes in the end of the manifold and the secondary into the CAT. As Bibbs has said they both have four wires.

I got a replacement from here.

 

I've never understood this 'no soldering' rule?

 

I have a couple of o2 sensors which are new, i believe they are the 4 wire ones..........i think the 2 white wires are pre-heaters.

What colours have you got?

 

Hi Si - it's not a rule as such, it's just the wires physically won't allow solder to stick to them.

Al, heater wires are white.

 

Cheers MB just seen that in the link.Mine are genuine Honda ones also.

 

I never had this problem when I replaced mine. I think this is a bit of myth, I certainly can't think of a reason why, resistance isnt too much of an issue as the ECU only looks at the switching of the Lambda voltage rather than raw output.

I replaced mine with Toyota one I had lying around (used to work for the supplier of all wiring to Toyota UK) and resoldered the connections

 

Not a myth in my case i've changed 2 on the S (to fit a wideband) and also 2 on Impreza's and none would solder. Odd.

Not sure what material they were. Maybe some differ.

ECU does take the raw voltage AFAIK, and looks at it all the time in a constant feedback loop, even on VTEC (althoug it becomes passive). It references against the ground signal.

Way OT now though