O2 sensor life expectancy?

[JohnA]

I guess it will have to be real lemons squeezed, not diluting a concentrate eh? lol...

[Digsy]

The second O2 sensor (on cars that have them) is there to monitor catalyst performance degradation. Its an OBD thing.

 

I know that NAs have a temp sensor instead. I think J-spec TTs only have one O2 sensor and no temp sensor. Not sure about UK TTs.

[JohnA]

The second O2 sensor (on cars that have them) is there to monitor catalyst performance degradation. Its an OBD thing....

Fair enough, but then why doesn't the ECU even blink when there is obviously no cat left?

That's what I wonder...

[Digsy]

Well, AFAIK only the first O2 sensor is used for fueling control, so it wouldn't cock that up. Maybe a catalyst failure isn't considered a "check engine" kind of fault, since it doesn't stop the engine running?

 

Has anyone tried checking a two-sensor exhaust system of 1994 to 1999 vintage to see if it actually flags a fault code on a Supra? Pretty sure it would do in a current model year car.

 

EOBD didn't come into force in Europe until 2000, but OBD2 has been mandatory in the States since 1995. Don't know about Japan, but I would guess they follow European rather than US regs.

[JohnA]

...EOBD didn't come into force in Europe until 2000, but OBD2 has been mandatory in the States since 1995. Don't know about Japan, but I would guess they follow European rather than US regs.

That was also my take, so I had a friendly 'disagreement' with a dude regarding to what the feck it is.

My guess was that it's a temp sensor (too thin for an O2 sensor) and his guess was that it is oxy. Taking it off and looking would have settled this, but didn't bother...

 

Now with the new emissions regime the ECU would be expected to make a big fuss if the sensor downstream sees nasty gases, but the Supra design is kinda old for that.

[imi]

Unfortunately my first UK choice (half price OEM lambda stuff) don't quote the Supra.

But US sites do, and at $65 - $75 depending on flange or not.

That's a third of rip-off UK

 

Anyone know of a half-decent UK supplier?

 

John, on the US site, it says that you need TWO o2 sensors?

 

How many o2 sensors does the PRE FACELIFT have, I would expect ONE being OBD1

while 2 sensors for the facelifted ones being OBD2

 

Is the flange required, or can one use the existing one?

 

Any update on UK suppliers and prices?

[JohnA]

John, on the US site, it says that you need TWO o2 sensors?

The US version is slightly different to the UK, they had the emmissions regulations earlier.

I'm really not sure if the second one is an oxygen sensor on UK cars, I've only had the supra for a few weeks and haven't had a chance to take things apart.

Experts from this site think that it's an O2 sensor, but I'd like to take it off and verify it. Or else the ECU would be complaining after a decat, wouldn't it?

 

Any update on UK suppliers and prices?

No, because I'll probably be using my wideband to send an emulated signal back to the ECU.

I've tried it before and the difference in running was immediately noticeable --- also believe it or not, the replacement wideband sensor from the UK AEM distributor is cheaper than Toyota's price for the narrow band. Almost half in fact.