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Thread: 97 P38 Oxygen Sensor issue?

  1. #1
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    97 P38 Oxygen Sensor issue?

    Hey all,

    Have been struggling with an intermittent problem for a while and next on the list is O2 sensors.

    New ones for my 97 HSE are around $750 a pair (?!) and since no one knows if it really is the sensors causing the issue (intermittent is too hard to pin down) im not keen on dropping $750 on it.

    Q - does anyone know of a cheaper option?! Lots online for around $100 but seems like a tricky issue with P38's from a dig round the forums.

    Q - can anyone in Sydney with a Gems P38 (pre cat O2 sensors) swap sensors with me for a few days? I'll do the hard work and supply a carton of your choice

    Thanks for any feedback,

    Dave

  2. #2
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    I didn't think the GEMS had o2 sensors. Mine doesn't.

  3. #3
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    Quote Originally Posted by ytt105 View Post
    I didn't think the GEMS had o2 sensors. Mine doesn't.
    Early ones didn't, later ones did.

  4. #4
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    Can help... I have some brand new ones under the house (advised by a dick head that I needed them replaced, however car is a 95 and pre-sensors).

    If you want to pm me an address, I can mail them to you express post... You would get them next day.

    We can work out a price if you need to buy them afterward, or just return them if yours check out ok.

    Hoo roo, Dave
    Hoo-Roo,

    Dave.

  5. #5
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    Quote Originally Posted by DT-P38 View Post
    Can help... I have some brand new ones under the house (advised by a dick head that I needed them replaced, however car is a 95 and pre-sensors).

    If you want to pm me an address, I can mail them to you express post... You would get them next day.

    We can work out a price if you need to buy them afterward, or just return them if yours check out ok.

    Hoo roo, Dave
    Legend

    Thanks Dave

  6. #6
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    If you have a half decent multimeter and a propane torch you can rig up a test for your O2 sensors and check them out as follows

    [ame=http://www.youtube.com/watch?v=stFhLSHsOGg]O2 Bench test - YouTube[/ame]

    cheers

  7. #7
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    Or else, any cheap OBDII scanner should be able to show you real time values from the O2 sensors. They normally fluctuate between 0.1v and 0.9v. Make sure that the fuelling system is in closed loop operation. If I run on LPG for a while, my petrol fuelling goes to Open Loop fuelling, ignoring the O2 sensors because a fualt has been logged saying that they are faulty. As soon as I clear the ECM fault, all goes back to normal and the ECM re-learns the correct petrol mixture by listening to the O2 sensors again.
    Now: 2005 L322 Vogue 4.4 M62TU (Black)
    Before: 2000 P38A HSE 4.6 - stately capability | 2008 Kluger KX-S | 2004 Forester | 2000 Yamaha XJR1300 | 1993 VR Calais | 1974 HQ Statesman - 308 V8 | HT | HK

  8. #8
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    GEMS sensors on the '97-'98 P38 aren't 0-1 volt. They are either 0-5V or 5-0V, totally different to the Bosch sensors.

  9. #9
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    So, Dave DT-P38 kindly sent me his spare to try out but are the wrong plug fit and i'm guessing from what i've read on the forums measure in the wrong voltages (?) so, i'm looking around for somewhere to buy a new set and have come accross sites like this one;Discovery Range Rover Freelander Lambda Sensor

    Range Rover P38A 02 Oxygen Sensor Exhaust Parts Available from RoversNorth.com

    Confusing thing is that to buy them from any LR parts reseller here in aus, i'm looking at around $700 - $800 a pair. Online they are all going for around $180 to $350 a pair!? Sounds too good to be true - am i missing something?!?

  10. #10
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    You shouldnt shell out until you know that yours are definitely broken. I made that mistake, bought some cheap ones from a US based online auto shop and had to send them back, only to find that my original ones were fine, but had been ignored by the ECU due to a stored fault.

    Connect a diagnostic scanner and check the values coming into the ECU from the sensors. Then you will know what you are hunting for.
    Now: 2005 L322 Vogue 4.4 M62TU (Black)
    Before: 2000 P38A HSE 4.6 - stately capability | 2008 Kluger KX-S | 2004 Forester | 2000 Yamaha XJR1300 | 1993 VR Calais | 1974 HQ Statesman - 308 V8 | HT | HK

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