Lambda help required please...

[Matthew]

Hi guys, failed MOT this morning on high emmisions...

Think I need a new Lambda, although I have a few quick questions I could do with clearing up.

I know there is a "pre" and "post" cat Lambda and that these are the same (apart from the legnth of the wire)

Now do I change them both, or just one of them?

If I do just change one, I assume it would be the "pre" cat sensor, and that this would be the one I needed?

http://www.eurocarparts.com/ecp/c/R...095db08b275572865f651f41b84757f154161040&LAMS

Any help would be great guys, as I dont want to get bent over (again) by Renault dealerships..

Thanks in advance

Matt.

 

[Dunn]

change the pre cat sensor this is the one that affects fueling

post cat just controls the emissions light to tell you if the cat is doing its job

personally i put some cat cleaner through before any mot with my clios otherwise they always seem to fail :/

also id get one from a motor factors, euro car parts are a nightmare for supplying incorrect parts even though it says they are for your model

plus it will be cheaper from a MF

 

[Matthew]

change the pre cat sensor this is the one that affects fueling

post cat just controls the emissions light to tell you if the cat is doing its job

personally i put some cat cleaner through before any mot with my clios otherwise they always seem to fail :/

also id get one from a motor factors, euro car parts are a nightmare for supplying incorrect parts even though it says they are for your model

plus it will be cheaper from a MF

Cheers mate, only thing is my MPG figures are fine, ie 40+ on the Mway etc...

I do get the emmisions light flashing me sometimes sat in trafic a while, so could that point to the "post" cat sensor then?

Thats why I'm leaning towards replacing them both to save the hasstle etc..

 

[Dunn]

http://reviews.halfords.com/4028/770073/reviews.htm

thats the cat cleaner

no dont change the post cat it only checks the cat is working, it doesnt affect any fueling of the car

perssonally id put that cleaner in and thrash it then retest it straight away

 

[Matthew]

Cheers for that mate, I will give it a go...

Do you know if this is the correct Lambda though for the pre cat sensor?

http://cgi.ebay.co.uk/NEW-BOSCH-LAM...arts_Vehicles_CarParts_SM&hash=item1c188e73f1

 

[Dunn]

It looks like the right one yes mate

 

[Matthew]

Nice one mate I'll get it ordered then!

 

[leewxm]

mine also failed due to emissions...changed the rear sensor,still failed.....so will changing the front 1 cure it?

 

[Matthew]

mine also failed due to emissions...changed the rear sensor,still failed.....so will changing the front 1 cure it?

Its meat to be the pre cat one that affects it mate so change that, thats what I'm doing...

 

[leewxm]

Its meat to be the pre cat one that affects it mate so change that, thats what I'm doing...

ok,cheers...let you know how i get on

 

[Matthew]

Nice one mate...

 

[Soot1e]

Might as well get it from ECP at least you can change it easily if the wrong part, I never a problem at my local ECP shop.

 

[leewxm]

changed my front lambda sensor & it passed....apparently he should have changed the front 1 before changing the rear 1...but good thing is hes only gonna charge me £50 for the front 1 including fitting