emmisions problem

[scotte666]

my car failed the mot with a decat put the cat back on and tired again.it failed the lambda sensor was slighty to highthe garage said it could be cat or sender.gunna borrow a cat and try that if not how much is a sensor??

[Zollo]

Hi mate

A new lambda sensor was £58 for mine. Sorted the rough running and hesitancy out completely too.

I think I got mine cheap, but they shouldn't be much more than that from GSF or ECP.

[Mark_Ritchspeed]

Havent bought one for a Clio recently, but I should imagine I can get them cheaper than that. Let me know if you want me to find out.

[scotte666]

it worth getting 1 if your running a decat?

[Zollo]

Yeah, because the sensor is located before the cat. Cat or no cat, the lambda is needed.

[Mark_Ritchspeed]

Yep, Lambda in basic terms tells the engine how much fuel it needs and a duff one can send mpg and performance downhill.

[scotte666]

i have 1 on there already. but the garage said without doing a diagnostic's they cant tell whether its the cat or the lamda.im borrowing a cat on sunday so il get it restested monday if it fails on emissions again i will be 95% sure its the lamda. the mot guy said running a decat will screw the lamda up (he talking crap) how much will a new lambda set me back if i need 1 as cheap as poss really...also is it just a case of unscrew old 1.screw in new 1

[BRUN]

dont pay more than £60 for one mate

you should be able to pick one up for £40-£50 id have thought

[scotte666]

will gsf do them?i lookedd on their site but couldnt see them?if my car fails emmisions again with a diff cat u think it is likely 2 be the sensor?does driving witha decat mess sensor up?

[Mark_Ritchspeed]

Just checked with our suppliers. £48 retail, but we can do them for £38 + p&p, which is only going to be £2-3. Let me know if you want one.

[Zollo]

Ok, so I didn't get mine very cheap at all then. Crap! :(

[scotte666]

mark il let u know on monday by 5 oclock ish mate any idea how long postage will take???is it just a case of unscrewing old 1 screw in new 1.???

[Mark_Ritchspeed]

BTW retail price of £48 is plus vat so is in reality £56.40. The price I quoted includes vat at £38.

[Zollo]

As far as I'm aware, running with a de-cat will not damage a lambda sensor. The lambda is before the cat, so unless exhaust gases flow backwards, it won't be effected at all!

[scotte666]

mark how long does delivery take next day????also it just a screw in job?

[Mark_Ritchspeed]

Delivery can be next day if required, but will obviously be slightly more expensive than normal delivery of 2-3 days.

Easy job to do, but make sure the old one gets a good soaking with wd40 (or similar) before taking it off.

[big hp]

My mate had problems with emissions after putting his cat on at garage and trying emissions. Ideally needs to do a few miles after fitting cat back on. He did 20 miles and re-tested it and it sailed through the MOT.

[Mark_Ritchspeed]

Big could be right. Didnt even occur to me that the Cat needs quite a bit of temperature in it to be working properly.

For this reason we rag the arses off cars when taking them for the MOT. The RX7 we had in a couple of months ago even melted the test probe it got that hot. :shock:

[scotte666]

i siad this to the mot guy i drove it about 2 miles after i refitte dit and the guy left the car running while he was testing a few other things.he said it wouldnt make a diff as long as it was up 2 temp. i thought if the lamda was screwed the car would run rough??i borrowed another cat so will put that on /(if i get over this hangover) retest 2moro see what happens

[Nick Hill]

I would recommend that you fit an o/e sensor not a universal type. I have seen on the diagnostic tester the aftermarket universal types have a different voltage output against mixture and can still give problems. Just my twopeneth worth from experience. Dont go to Renault for one though as the o/e unit is Bosch and can be bought much cheaper from a Bosch dealer.

[scotte666]

i had it restested with a different cat mate passed straight throigh

[Jamie.]

yeah someone i know has a willy 3 and the same thing happend to him, the cat was focked, just kept failing the emissions test. he said that the cats reguraly go?!