Nowucme

Apologies for kinda repeating the other thread on similar topic, but am looking for quick responses:

Just got back from MOT and MY00 failed on emissions - results were:

CO 5% - should be less than 0.3%. It also has the Lambda as a fail.

Now the mechanic said its nothing to do with CAT's as if the engine is working correctly then the exhaust fumes wouldn't even reach a CAT with CO levels this high.

Is this correct?

Could the Lambda sensor be faulty and if so would that cause CO levels to be this high?

What else could it be? Mis-fire??

Edited to say - could the ECU error log identify the fault?

Thanks for any speedy responses

MrDBM

possibly your o2 (lambda) sensor, my MY00 had it's MOT a few weeks ago, so I know how you feel!

Months before my MOT the dealership diagnosed a failed o2 sensor, to which I thought, bummer The dealership said it would more than likely fail the MoT

I looked at the sensor and it was covered in crap, plus the sheathing/cover was a bit loose. Anyway, I took off the cover and cleaned it all up with some wd40 and about a hundred kitchen wipe things. I packed it all back together and sealed it up with electrical tape. Since then my hesitation has vanished (???) but the car passed it's emissions fine.

What temp was the engine at when the test was performed, I seem to remember someone saying this has an impact, hence I got my engine really warm before the test.

MrDBM

just to add, the sensor is about £180 fitted from a main dealer, but Halfords do a replacement for around £40, but it's not a direct replacement as such.

There's a few more threads hangiong around, try a search for some more info.

hope you get it sorted

Nowucme

Thanks MrDBM.

The engine was v warm

Can you detail a bit more re replacing the Lambda sensor as the search of similar topics points to this as a likely cause.

Where is it on a MY00, how easy to replace myself? Am I better getting the Halfords job and taking it to the garage for them to fit?

bits'n'pieces

Lambda sensor is what looks like a largew spark plug thing, mounted in the exhaust system before the CAT, it'll undo with a large spanner, usually has three wires but places like sam centre etc sometime supply ones with 4 wires (avoid), buy the 3 wire one from halfords or somewhere like that, it'll either have one black and two grey wires or one black and two white ones, connect the black to black on your wiring loom and the other two to the other two wires (doesnt matter which), worked for mine but you'll need a soldering iron to solder the new sensor to the original ones wiring clip into the loom, piece of Pi$$. Passed the MOT brilliantly.

Paul.

Edited cause even I couldn't understand it !

[Edited by bits'n'pieces - 10/30/2003 3:03:52 PM]

MrDBM

no problem, I didn't actually replace mine, as it seemed perfect with a good clean

If it needs replacing (probably will v soon) then I'll do the Halfords thing. I think it's a Bosch unit they sell, altjough I could be mistaken.

Scoobybits

i have some lamba sensors if ya want one mail me ?£25 ??inc postage

Nowucme

Jase,

What exactly are they? Standard Subaru parts or something else?