Lambda Sensor

[boomerbang2006]

Just a quick question,will a faulty lambda sensor ruin my mpg?

 

[MartinR]

yes

 

[boomerbang2006]

Ok,then i`ll need to change it.thanks.

 

[Perry]

Just done mine this morning, a bit fiddly but only took about half an hour which included jacking up the car and rechecking on here to see how the lambda clips in.

 

[James28]

The front one will if its faulty.
The rear one won't. That only measures emissions.

Edit: Perry would it be possible to send me your old one . I need a bung for my decat! Unless you still have use for it!

 

[Perry]

Yeah you can have it, just got it out of the bin!

 

[James28]

Cheers mate! That'd be cracking. Do you want me to fire over some money on paypal for postage? PM me

 

[M@tt_182]

Where is the plug for the front one? I was having a snoop about for it but couldn't see it.

 

[Jonny1*2]

Where is the plug for the front one? I was having a snoop about for it but couldn't see it.

It's easier to see from underneath, as you would need to remove airbox and engine cover to get to it. Follow the wiring from the top GB earth as its branched off that.

 

[M@tt_182]

It's easier to see from underneath, as you would need to remove airbox and engine cover to get to it. Follow the wiring from the top GB earth as its branched off that.

Thanks, might have a look if it ever stops raining!

 

[Jonny1*2]

Just a quick question,will a faulty lambda sensor ruin my mpg?

There are other causes for that though. Are you 100% that the lambda is broken?

 

[boomerbang2006]

Took it to the garage anyway,they had done a diagnostics on the car earlier because i`d had an engine management light come on.Unfortunately the eml has come on again,so might have a tinker tomorrow and see whats what.

 

[DannyR]

Are post and pre cat lambdas the same part?

 

[boomerbang2006]

No,when i priced up mine,the pre cat lambda is different to the post cat.

 

[DannyR]

Probably explains why my MPG is worse after putting one in today then!

 

[-J-]

Iirc the only difference between Pre and Post us the length of the sensor cable, otherwise they are the same.

 

[DannyR]

Oh really? That was the same as the one I replaced with, ph2 post cat into a ph1 pre cat so should be fine?

I was barely getting 21mpg now barely getting 16!

 

[Jonny1*2]

Iirc the only difference between Pre and Post us the length of the sensor cable, otherwise they are the same.

This

 

[DannyR]

b****cks looks like I've fitted a worse lambda sensor then

 

[LewisTaylor]

b****cks looks like I've fitted a worse lambda sensor then

Are you sure, i wasn't having any problems before it was took off...

 

[DannyR]

You were running omex so wouldn't of had a warning light. Post cat only tells you if you catalytic converter isn't working it doesn't really do anything!

 

[LewisTaylor]

Fair enough.

 

[boomerbang2006]

I drove to barmouth and back from the west midlands yesterday with the new lambda and the start of the journey my mpg was 36.5,when i got back it was 38.2,so at least it works.

 

[DannyR]

Did you buy new? If so genuine or not? Price too

 

[Jonny1*2]

I drove to barmouth and back from the west midlands yesterday with the new lambda and the start of the journey my mpg was 36.5,when i got back it was 38.2,so at least it works.

A knackered lambda would have caused a bigger drop than that mate

 

[boomerbang2006]

Bought new,garage charged me £87,which is the price from renault,(autoworld),i have the engine management light on again,so it wont be the lambda then?

 

[James28]

Which one did you replace?
The front one will be the one that affects the MPG performance.
The rear one will be the one putting your Engine management light on.

 

[James28]

Oh really? That was the same as the one I replaced with, ph2 post cat into a ph1 pre cat so should be fine?

I was barely getting 21mpg now barely getting 16!

I wouldn't have thought a Lambda would be causing that big a MPG difference from normal anyway, even when it was at 21mpg?
I get around 35 on my 182.

 

[boomerbang2006]

Which one did you replace?
The front one will be the one that affects the MPG performance.
The rear one will be the one putting your Engine management light on.[QUOTE

They replaced the front one(pre cat),thats what the diagnostics came up,are you telling me that i need the 2nd one replacing too?

 

[Andyman]

Decent price for anyone after the pair

http://www.northwestperformance.co.uk/product_info.php?products_id=353&osCsid=hh8ki4l4fpvsqc0hi7mi5lg284

 

[boomerbang2006]

Took the car to the garage,he has cancelled the engine management light,fault read cat?....if it comes on again i`ll take it in.Hope its not the second lambda

 

[James28]

Yes. You understood me correct.

If the rear one is faulty, it will be putting on the emission light. Regardless of whether you changed the front one.
Try swapping them round see if it goes off, then you'll know the rear lambda needs replacing.

 

[James28]

Received the Lambda yesterday Perry. Thanks a lot! Top bloke!

 

[kiares07]

I had this. Turned out to be an injector after changing both lambda