Anyone know which cars (that are likely to be found in a Taiwanese scrapyard) had heated oxygen sensors? (AKA Lambda sensor).
I think these usually have 4 or 3 wires.
Aren’t all oxygen sensors heated? As far as I know, they connect to the exhaust pipe just after the exhaust manifold.
That being said, they are found in fuel injected engines. They work based on how hot the exhaust is and from the
heat the oxygen sensor will send so many volts to the ECU. I’m guessing you understand that exhaust from a lean
fuel mixture is hot and a rich fuel mixture is cool.
And yes, they are usually have 3-4 wires.
All non-diesel engines since about the mid 1990s have heated sensors!
The problem is they are pretty much impossible to get to unless the car is up on a lift or jackstands.
Not only that, but they are usually rusted on there good and solid, and a 7/8 or 22mm crescent spanner will just round off the flats on the sensor.
You need a 22mm flare wrench or an o2 sensor socket to do the job properly (or better still, cut off the pigtail and put a ring spanner on it)
Old ones may not be working or be marginal. They get poisoned, you know. :neutral:
A new one costs only NT$1000-1500 so why bother with all the hassle?
[quote=“monkey”]All non-diesel engines since about the mid 1990s have heated sensors!
The problem is they are pretty much impossible to get to unless the car is up on a lift or jackstands.
Not only that, but they are usually rusted on there good and solid, and a 7/8 or 22mm crescent spanner will just round off the flats on the sensor.
You need a 22mm flare wrench or an o2 sensor socket to do the job properly (or better still, cut off the pigtail and put a ring spanner on it)
Old ones may not be working or be marginal. They get poisoned, you know. :neutral:
A new one costs only NT$1000-1500 so why bother with all the hassle?[/quote]
Thought they’d be dearer. I have spotted an abandoned car that’s a possible donor (I have jackstands) if it’s still there in a month or so (no time now) but if it isn’t or its too difficult I may just do as you suggest. Thanks.
[quote=“johnledoe”]Aren’t all oxygen sensors heated? As far as I know, they connect to the exhaust pipe just after the exhaust manifold.
That being said, they are found in fuel injected engines. They work based on how hot the exhaust is and from the
heat the oxygen sensor will send so many volts to the ECU. I’m guessing you understand that exhaust from a lean
fuel mixture is hot and a rich fuel mixture is cool.
And yes, they are usually have 3-4 wires.[/quote]
IIRC its a little more complicated than that. You seem to be describing an Exhaust Gas Temperature sensor, which I believe also exist.
Where do you live? I have a crowsfoot o2 sensor socket you can borrow. It’s a standard 3/8 ratchet drive.
And you do know the pigtail connectors are different for different manufacturers?
If you cut one off, you are gonna need to solder the wires to your existing pigtail.
You’ll need to use heat-shrink insulation because PVC tape or glues or whatever are just gonna melt off or catch fire close to the exhaust (it’s about 500 celsius where the o2 sensor sits).
I thought most oxygen sensors were like this
That’s where I got my understanding of how they work.
[quote=“monkey”]Where do you live? I have a crowsfoot o2 sensor socket you can borrow. It’s a standard 3/8 ratchet drive.
And you do know the pigtail connectors are different for different manufacturers?
If you cut one off, you are gonna need to solder the wires to your existing pigtail.
You’ll need to use heat-shrink insulation because PVC tape or glues or whatever are just gonna melt off or catch fire close to the exhaust (it’s about 500 celsius where the o2 sensor sits).[/quote]
Thanks for the offer. I’m in Tainan.
I’ve seen the specific socket you mention for sale in a Kaoshiung tool store, but, since it’d likely be a one-off use (assuming I don’t end up owning a car that has one) I might just cut that section of exhaust out, if its accessible.
IF I actually get around to doing anything at all with it I’ll likely use it at the back of the exhaust (hence the need for it to be heated) so it shouldn’t be exposed to high external temperatures.