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Author Subject: Failed Emissions (MOT)
keep-3

Senior User

Location: Hereford

Registered: 16 May 2006

Posts: 693

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Post #1
Hi,

Can anyone offer any advice on the follow results from my MOT.

1.(too high) Exhaust emissions carbon monoxide content at idle excessive [7.3.D.2c]

2.(too high) Exhaust emissions carbon monoxide after 2nd fast idle excessive [7.3.D.3b]

3.(too high) Exhaust emissions hydrocarbon content after 2nd fast idle excessive [7.3.D.2b]

4.Exhaust emissions Lambda reading after 2nd fast idle outside specified limits [7.3.D.3b}

Any advice would be greatly appreciated so that I can try and get it sorted tomorrow.
Posted 24th Jul 2010 at 00:38
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chris167

Seasoned Pro

Location: hull

Registered: 14 Dec 2007

Posts: 1,181

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Post #2
yeah take the decat off LOL

did you ask the mot tester what could be causing the problem?

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Posted 24th Jul 2010 at 00:40
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keep-3

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Location: Hereford

Registered: 16 May 2006

Posts: 693

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Post #3
yeah but he just said book it in and he would tell me.
Posted 24th Jul 2010 at 00:49
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #4
what exactly were the figures?

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Posted 24th Jul 2010 at 02:37
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keep-3

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Location: Hereford

Registered: 16 May 2006

Posts: 693

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Post #5
He never gave me any, wasn't very helpful to be honest. I'll take it to a different garage tomorrow as its a bit out of my league I think.
Posted 24th Jul 2010 at 03:44
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #6
he should have given you a printout.

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Posted 24th Jul 2010 at 04:24
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anthony_p_59

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Registered: 27 Mar 2009

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Post #7
+1

should have all the info on/with your red faliure sheet
Posted 24th Jul 2010 at 05:39
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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,838

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Post #8
wont be on the red sheet, would be on a separate printout directly from the emissions testing machine.

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Posted 24th Jul 2010 at 15:31
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keep-3

Senior User

Location: Hereford

Registered: 16 May 2006

Posts: 693

Status: Offline
Post #9
Rang them up this morning, they said they couldn't find it but offered to re run the test for free.

This time he said the results were completely different but still an MOT fail.

fast idle test: CO=1.299
second fast idle test: CO=0.934

He said yesterday it also failed on the natural idle test with a CO score of around 8.0 but today it passed at 0.208

suggested I replace the lambda. Any thoughts?
Posted 24th Jul 2010 at 18:14
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spike_uk06

Seasoned Pro

Location: Billingshurst

Registered: 03 Aug 2006

Posts: 1,637

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Post #10
Lambda is a good bet Yes

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Posted 25th Jul 2010 at 00:36
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rallyebonz

Newbie

Location: At work mostly

Registered: 15 Jun 2006

Posts: 49

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Post #11
My rally has just failed on emissions, it was the lambda. Changed it and it flew through

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Posted 25th Jul 2010 at 04:24
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bonzo

Seasoned Pro

Location: Telford

Registered: 06 Nov 2007

Posts: 2,272

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Post #12
I just had the same issue and suggestion of lambda and they said they'd get back to me tomorrow (so they can get some prices to give me a quote to do the work).

Would giving the lambda a clean with some carb cleaner do anything for the emissions or not really?
I've very little money to spend on the car this month! LOL

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Posted 6th Aug 2010 at 23:59
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simonjames

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Location: Whitland S.Wales

Registered: 23 Nov 2004

Posts: 6,219

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Post #13
Try the lambda also the ect (green sensor on thermostat housing) could be causing

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Posted 7th Aug 2010 at 00:09
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lotek

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Location: Berkshire

Registered: 04 Dec 2007

Posts: 6,107

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Post #14
do what simon said and before your test add injector cleaner and go for a PROPER BLITZ!

get the cat as hot as you can! it will help your figures
Posted 3rd Sep 2010 at 19:30
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