Results 1 to 6 of 6

Thread: O2 sensor 4agze..

  1. #1
    Senior Member adds's Avatar
    Join Date
    May 2010
    Name
    Adam
    State
    NSW
    Location
    St George
    Country
    Australia
    Posts
    367

    Default O2 sensor 4agze..


    TO REMOVE ADS, PLEASE
    REGISTER OR SIGN IN
    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

  • #2
    Senior Member Hen may possibly be a nut's Avatar
    Join Date
    Jan 2009
    Name
    Hen
    State
    Victoria
    Location
    Mt Macedon
    Country
    Australia
    Posts
    909

    Default

    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

  • #3
    Senior Member adds's Avatar
    Join Date
    May 2010
    Name
    Adam
    State
    NSW
    Location
    St George
    Country
    Australia
    Posts
    367

    Default

    Cheers mate exactly what I needed to know.

  • #4
    Senior Member Hen may possibly be a nut's Avatar
    Join Date
    Jan 2009
    Name
    Hen
    State
    Victoria
    Location
    Mt Macedon
    Country
    Australia
    Posts
    909

    Default

    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.

  • #5
    Senior Member adds's Avatar
    Join Date
    May 2010
    Name
    Adam
    State
    NSW
    Location
    St George
    Country
    Australia
    Posts
    367

    Default

    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

  • #6
    Member
    Join Date
    May 2012
    Name
    Sam
    State
    ACT
    Location
    belconnen
    Country
    Australia
    Posts
    60

    Default


    TO REMOVE ADS, PLEASE
    REGISTER OR SIGN IN
    Quote Originally Posted by Hen may possibly be a nut View Post
    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.
    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.

  • Similar Threads

    1. O2 sensor question
      By haveaparty in forum Technical - Questions
      Replies: 10
      Last Post: 2nd November 2012, 09:15 PM
    2. O2 sensor mounting
      By ke_70_blue in forum Technical - Questions
      Replies: 8
      Last Post: 8th April 2012, 01:10 AM
    3. O2 sensor, what type do i need?
      By danny_ke70 in forum Technical - Questions
      Replies: 6
      Last Post: 15th October 2010, 07:24 PM
    4. O2 sensor issues
      By Faceplant456 in forum Technical - Questions
      Replies: 8
      Last Post: 21st December 2009, 01:22 AM
    5. o2 Sensor 4AGZE
      By SKREMN in forum Technical - Questions
      Replies: 8
      Last Post: 27th October 2006, 12:26 PM

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •