o2 sensor problem.

[Miyagi]

Hi guys

Quick question for you many experts.

Apparently the o2 sensor on my car has gone, does anyone know how this will affect the car?

My car has been feeling slightly down on power and I'm wondering if this could be the cause?

My friend has told me that it could at lower speeds but doubtful on full loads....but he is no expert so I thought I'd check.

Thanks

[trickywoo]

It provides the ecu with information about the efficency of combustion so if its duff you could be under / over fueling at different points in the rev range.

Unburnt fuel going through the cat will also kill it over time.

Besides anything else you won't pass the MOT emmissions test.

[Ade355]

Miyagi said:

Hi guys
Quick question for you many experts.
Apparently the o2 sensor on my car has gone, does anyone know how this will affect the car?
My car has been feeling slightly down on power and I'm wondering if this could be the cause?
My friend has told me that it could at lower speeds but doubtful on full loads....but he is no expert so I thought I'd check.
Thanks

You dont want to allow the engine to run lean. Less lubricant, more fricton therefore engine wear. Is the car overheating slightly?

Edited by Ade355 on Monday 8th October 12:38

[ThatPhilBrettGuy]

Most cars only use the lamda sensor at low thottle settings and just use the map higher up the rev range. It'll probably run rich on tickover and pottering about, but be fine pressing on.

[Brother Mycroft]

From this very forum just last week...

[quote=Brother Mycroft]Before buying anything...

This is from a forum I used to post in... it's from June 1999...

Piece of advice, if you can remove your Oxygen sensor then once a year, do it, having bought a large lemon at your nearby Fruiterers/Supermarket earlier in the day, cut the lemon in half, and insert the tip of the probe in each of the segments for 10 minutes... you can with the other half of the lemon cut it in slices put them in a glass and while you wait for this 'mod' to do its work, pour yourself a little gin, a splash of tonic, a couple of cubes of ice, sit down, sip the drink while you twiddle the probe in the lemon congratulating yourself at being such a cool dude improving your car this way.

Cheap too.

[Miyagi]

Ade355 said:

Miyagi said:

Hi guys
Quick question for you many experts.
Apparently the o2 sensor on my car has gone, does anyone know how this will affect the car?
My car has been feeling slightly down on power and I'm wondering if this could be the cause?
My friend has told me that it could at lower speeds but doubtful on full loads....but he is no expert so I thought I'd check.
Thanks

You dont want to allow the engine to run lean. Less lubricant, more fricton therefore engine wear. Is the car overheating slightly?

Edited by Ade355 on Monday 8th October 12:38

Hi Guys

I got the problem fixed and I am nearly £500 lighter!

Took the car for a dyno run to see if I was down on power and unless the dyno was not having it's best day. I was considerably down on power

Nobody could really give me an answer as to why. Lambo weren't sure and told me not to worry, as there was no error codes showing up. The Dyno company told me it could be due to the ECU being reset and needs to relearn....

So apparently I need to drive the car lots over the next few days and I will take it back.

What do you think?

[blot]

I think you should go to the Col du Turini Miyagi, RIGHT NOW!

[ThatPhilBrettGuy]

Have you used that dyno before?

[Miyagi]

ThatPhilBrettGuy said:

Have you used that dyno before?

NEVER....

[Miyagi]

blot said:

I think you should go to the Col du Turini Miyagi, RIGHT NOW!

Whats Col du Turini sir?

[ThatPhilBrettGuy]

Miyagi said:

ThatPhilBrettGuy said:

Have you used that dyno before?

NEVER....

Well, I wouldn't get overly worried up over the results. They all read different numbers and very few have been calibrated correctly.

Most of the issue is the calculation of the transmission losses. Getting the at-the-wheels numbers is fine but working out the flywheel numbers from that is at best, guesstimate world.

What were the figures and did they give you any graphs?

[Miyagi]

ThatPhilBrettGuy said:

Miyagi said:

ThatPhilBrettGuy said:

Have you used that dyno before?

NEVER....

Well, I wouldn't get overly worried up over the results. They all read different numbers and very few have been calibrated correctly.

Most of the issue is the calculation of the transmission losses. Getting the at-the-wheels numbers is fine but working out the flywheel numbers from that is at best, guesstimate world.

What were the figures and did they give you any graphs?

No graphs as they were out of ink....

They showed me the figure which was 445 HP, I nearly cried

Lol I just want to know my car is working correctly....I'm not going to get overly worried my car feels great and sounds great so I can't believe it's lost that much power

[blot]

Miyagi said:

blot said:

I think you should go to the Col du Turini Miyagi, RIGHT NOW!

Whats Col du Turini sir?

Drive to monaco turn left, go up hill.....

[Miyagi]

Brother Mycroft said:

From this very forum just last week...

Brother Mycroft said:

Before buying anything...

This is from a forum I used to post in... it's from June 1999...

Piece of advice, if you can remove your Oxygen sensor then once a year, do it, having bought a large lemon at your nearby Fruiterers/Supermarket earlier in the day, cut the lemon in half, and insert the tip of the probe in each of the segments for 10 minutes... you can with the other half of the lemon cut it in slices put them in a glass and while you wait for this 'mod' to do its work, pour yourself a little gin, a splash of tonic, a couple of cubes of ice, sit down, sip the drink while you twiddle the probe in the lemon congratulating yourself at being such a cool dude improving your car this way.

Cheap too.

WTF? I just noticed this, are you serious? LOL

[Brother Mycroft]

Yes.

For real.

[Miyagi]

Brother Mycroft said:

Yes.

For real.

Do you know how many lemons could I have bought with £500??

Lol!

Would look great on Auto trader description when you come to sell the car though

[Brother Mycroft]

Miyagi said:

Brother Mycroft said:

Yes.

For real.

Do you know how many lemons could I have bought with £500??

Lol!

Would look great on Auto trader description when you come to sell the car though

Would you announce to the world [well the Autotrader world anyway] that you were duped by a canny dealer into buying something totally unnecessary?

I would keep such info off the the net if I were thee.

[ThatPhilBrettGuy]

Brother Mycroft said:

Yes.

For real.

So you dip the sensor in acid for a bit. Wht do you think you are removing with it?

Anyway, most lamda sensors break due to heat cycling, cracking the surface and breaking the sensor wires. You could put it in a whole bowl of fruit and it's still going to be broken.

[Brother Mycroft]

ThatPhilBrettGuy said:

Brother Mycroft said:

Yes.

For real.

So you dip the sensor in acid for a bit. [1] Wht do you think you are removing with it?

Anyway, [2] most lamda sensors break due to heat cycling, [3] cracking the surface and [4] breaking the sensor wires. You could put it in a whole bowl of fruit and it's still going to be broken.

1/. Citric acid is the perfect cleaner of Zirconium Dioxide it will unbond lead and silicone from it in a similar that Acetone unsticks 'Superglue'... i.e. the molecules are smaller and are invasive to the adherent but benign to host surface.

2/. That is the main cause or irretrievable death for one, but it is an infrequent occurrence.

3/. This appears to be due to clumsy removal in most cases, they are sometimes damned awkward to get off.

4/. This does not mean that you replace the entire unit, repairing a wire in mundane to some but it is simply good sense to repair the wires.

Use this as a rule...

If your probe has:-

1 or 2 wires... it is unheated and its failure is almost certainly contamination and the above described cleaning method is 100% effective.

Never allow anyone to 'test' the unit with anything that creates a voltage/resistance... the process that creates the charge/resistance between the Zirconum and the inner Platinum sheath is electron flow direction sensitive and any testing will screw it up unless you know exactly how to test such a sensitive flow correctly and that requires a bench set of gear!

3 or 4 wires... it is a heated unit, you can check for continuity in that [heating] circuit [with an Ohmeter]... but NEVER in the other... EVER.

[*LamboAndy*]

There's nothing really to worry about with this I've had four or so replaced on mine. All it does is make to fuel economy worse (if thats possible!)

Andy.