O2 sensor 4agze..

[adds]

Hey so after searching for a while, I can't seem to get a straight answer. All replies to anything on the GZE O2 sensor have 2 different opinions . So I was hoping someone can set me straight..!

I have a GZE (converted to turbo if it matters) running on stock AFM DLI ecu. What O2 sensor will I need? 1,3 or 4 wire? 18w? Heated?

flange or threads don't matter as ill make whatever I get work..

Cheers

[Hen may possibly be a nut]

All O2 sensors (bar wideband) have the same function. 1, 2, 3 or 4 wire all give the same signal, just some have sensor ground as a seperate wire (rather than through the exhaust and body) and some have a heater.

A heated one will give a better reading quicker, rather than having to wait for the exhaust to heat it. This means you can mount it further down the exhaust (probably more of an issue with fancy long runner NA extractors than on a turbo setup).

One with sensor earth should give a more accurate signal as you don't have any effect from the quality (or lack thereof) of earth connections to the engine and exhaust.

But in general don't stress. I'd personally get a 4 wire (heater +, heater gnd, signal and signal gnd) as they are the "best", but if you have a good 1 wire to hand or can get one cheap that shouldn't be an issue either.

Hen

[adds]

Cheers mate exactly what I needed to know.

[Hen may possibly be a nut]

Was just thinking and I may have given some bad advice. I'm not actually sure how the heaters on heated oxy sensors should run. Some 20V ECUs have a heater control pin, meaning that the ECU switches the heater on and off, maybe to maintain a certain temperature. I've also connected the heater element to IG+ before, but must admit I don't know if that is "correct" or dodgy. So have a bit more of a look into how heater elements are run. I don't think it should be a problem, but am afraid I don't know for sure.

[adds]

looking at the wiring diagrams it looks to be a single wire that taps into the diagnostics with the option of another wire that goes to engine earth..?

should i just get a 2 wire and run it to engine earth and ecu signal

[SamsTA22]

I haven't seen an ECU switch the heater off on an O2 sensor while the engines running. Unless the car had an EGT sensor, they wouldn't have any means for a control circuit.
Having them connected to IG+ should always be fine, its all I've ever done for widebands as well (admittedly they're a bit different). The temperature of the sensor should reach an equilibrium from the exhaust flow anyway, no matter what the heater is doing.

As for the types, I don't think there's any real advantage to a 4 wire sensor over a 3 wire sensor, if the ECU wasn't designed for a 4 wire in the first place. If you got a 4 wire, the grounds would be joined together anyway. And the only reason I know of that they switched to 4 wire is so they can sense the circuit to see if the sensor has gone bad or been removed.