MOT Fail CO2 emissions

christaylor · 09-08-2008, 12:03

Failed my MOT on CO2 emissions car passed everything else. It has to be under 0.3% and mine after being tested numerous times was running at 0.9% which is way over. I rang blueflame as I have the turbo back exhaust with 100 cell cat and they said it could be the lamda sensor or the cat?? I am pretty annoyed as I thought it would go straight through as it is a 55 plate with 22,000 miles. Has anybody else had this problem?

**mannyo** · 09-08-2008, 12:12

My old mk1 could barely pass the mot with a 100cel cat, and then it needed the engine to have been really hot and been driven hard for several mins before the test.

If the car was left to cool to much it would fail by a considerable margin, I wonder how long yours was standing before being tested.

RichieVRS · 09-08-2008, 12:27

Ouch, sounds a bit costly to get it through now. 100cel cat have much to do with it only i think i have seen this prob around the forums with 100cel cats before?!?!?!? though i maybe wrong

martziniuk · 09-08-2008, 12:33

Mine was close but passed

smstext · 09-08-2008, 12:38

An MOT friend told me when i had a problem on a car that was failing on the exhaust emmisions to put in double the amount of redex to recommended and take it for a 50 mile burn, push it hard so you can clean the system and remove crap.

when you do get back to the mot station keep it running.

k04 · 09-08-2008, 14:42

When i emailed BlueFlame they sent one back saying that they only do 200cels cats now

Is this true?

It seems that every now and then this subject pops up about cars failing their MOTs because of the cat

I want a BlueFlame Turbo back for mine but if this problem keeps arising now im having doubts

Wayne Kerr · 09-08-2008, 16:27

Quote:

Originally Posted by smstext

An MOT friend told me when i had a problem on a car that was failing on the exhaust emmisions to put in double the amount of redex to recommended and take it for a 50 mile burn, push it hard so you can clean the system and remove crap.

when you do get back to the mot station keep it running.

Have you tried this yet?

richm · 09-08-2008, 17:53

i have a very cheap 200cel Cat from the States in mine, passed no problem for the second time this year.. it will have to be properly hot to stand a chance.
Are you certain there is no chance of an air leak between the engine and lambda sensor? That would artificially force a rich mixture.
Do u get any fault codes logged in respect of Catalytic Converter System efficiency? I regularly get that, it seems to tie in with periods of extended idling when the Cat can cool down too much to work properly and the rear lambda sensor throws a benny, never turns the engine light on, just sets the code.

Wayne Kerr · 09-08-2008, 18:24

No air leaks on mine Rich.
My 100 cel cat logs as Catalytic Converter System below efficiency & turns the engine light on after about 80 miles of 'soft' driving.
With the loud pedal on ,,,,, it don't happen!

Interesting fact has emerged here, if it's cold, it will fail.
After several attempts on the CO2 measurment lark, the reading got lower each time!
May try the Redex lark though.

smstext · 09-08-2008, 18:40

Quote:

Originally Posted by Wayne Kerr

Have you tried this yet?

yes on my astra mk4 that i had. the following year was worse so the mechanic gave the lambada sensor a quick clean too. cant remember how far out it was but the main problem i had the first time was the cat needed replacing as it was shot away after the car had a problem of misfire which blew the cat apart, certainly cheaper than replacing it and worked.

richm · 09-08-2008, 18:59

It is surprising how many minutes even a standard Cat may need at 3000rpm offload to get it hot enough to light off and work, a lot of garages are just not patient to wait long enough

it's easier to say it failed and needs a new Cat.
Because of the way it works, it's not a case of the readings dropping gently as it starts working, it will often be way out then suddenly drop as the Cat gets hot enough and lights off. The lazy MOT tester will see the readings not dropping after a couple of minutes and call it a fail.
It will always help if you are able to give it some on the way to the test station and get the test done as soon as possible while the heat is still in the Cat.

smstext · 09-08-2008, 19:06

the joys of while you wait mot places

Wayne Kerr · 09-08-2008, 19:12

Quote:

Originally Posted by smstext

the joys of while you wait mot places

Or the joys of a 'friendly' MOT place.

smstext · 09-08-2008, 19:33

Quote:

Originally Posted by Wayne Kerr

Or the joys of a 'friendly' MOT place.

i personally couldnt comment

christaylor · 09-08-2008, 20:51

looks like it might be worth giving it the beans then taking it straight for emissions test and then hoping that it just passes.

k04 · 09-08-2008, 22:02

Good luck!
Let us all know if it passes

martziniuk · 09-08-2008, 22:04

Its got along way to go to get down to 0.3 but good luck.

fordfan · 10-08-2008, 08:43

What's the air filter like?, have you considered trying a fuel system cleaner?

Also you are getting your CO2 (Carbon Dioxide) and CO (Carbon Monoxide) confused. CO2 for VED banding and CO for emissions.

martziniuk · 10-08-2008, 10:53

I wounder if using 99 octane petrol would help the emissions?

christaylor · 10-08-2008, 12:57

I use shell v power already and I use STP fuel system cleaner in the silver bottle so not sure what else I can do apart from get the cat super hot. Thanks fordfan yes i just realised that it is CO rather than CO2!

Funkoid · 10-08-2008, 21:53

I'm putting my stock 55 vRS through for its first MOT tomorrow, you've put the fear of god in me now!!!

k04 · 10-08-2008, 22:07

should fly through mate,being stock and on a 55plate

I wouldnt worry

Funkoid · 10-08-2008, 22:08

.... there was me hoping to have an excuse to give it a "gentle" drive down the motorway tomorrow

k04 · 10-08-2008, 22:23

You still can!

Gentle tho of course!

Bowders1 · 10-08-2008, 23:26

I have Blueflame turbo back and could not get through emissions until I changed the lambda sensors. Now goes through ok.

09-08-2008, 12:03	#1
christaylor Briskodian Join Date: Sep 2006 Location: York Posts: 95 Thanks: 2 Thanked 3 Times in 3 Posts	MOT Fail CO2 emissions Failed my MOT on CO2 emissions car passed everything else. It has to be under 0.3% and mine after being tested numerous times was running at 0.9% which is way over. I rang blueflame as I have the turbo back exhaust with 100 cell cat and they said it could be the lamda sensor or the cat?? I am pretty annoyed as I thought it would go straight through as it is a 55 plate with 22,000 miles. Has anybody else had this problem? __________________ Octavia vRS Mk1 55 Plate Corrida Red Blueflame turbo back exhaust 200 cell Cat, Carbonio C.A.I, Forge T.I.P, Forge Diverter Valve, Forge/Samco Hoses, N75-J Valve, Toyo Proxes TR1's and remap soon to come

09-08-2008, 12:12	#2
mannyo BRISKODA Staff Join Date: Nov 2002 Location: Stevenage Herts. Posts: 11,442 Thanks: 56 Thanked 357 Times in 329 Posts	Re: MOT Fail CO2 emissions My old mk1 could barely pass the mot with a 100cel cat, and then it needed the engine to have been really hot and been driven hard for several mins before the test. If the car was left to cool to much it would fail by a considerable margin, I wonder how long yours was standing before being tested. __________________ Manny 2005 Octavia 2.0TDi Elegance combi my skoda website http://www.octaviars.co.uk Join the briskoda.net folding team click Here for more info

09-08-2008, 12:27	#3
RichieVRS Briskodian Join Date: May 2008 Location: South West Posts: 181 Thanks: 14 Thanked 9 Times in 9 Posts	Re: MOT Fail CO2 emissions Ouch, sounds a bit costly to get it through now. 100cel cat have much to do with it only i think i have seen this prob around the forums with 100cel cats before?!?!?!? though i maybe wrong

09-08-2008, 12:33	#4
martziniuk Need more power Join Date: Feb 2007 Location: Driffield, Good old yorkshire Posts: 1,944 Thanks: 54 Thanked 160 Times in 155 Posts	Re: MOT Fail CO2 emissions Mine was close but passed __________________ Regards Martin Turbo back blueflame exhaust ,Forge 007p Dump valve,Prosport boost gauge, Autobahn88 TIP, Ecu Evolution Remap, FMIC

09-08-2008, 12:38	#5
smstext 2.0 FSI Sport. Join Date: May 2007 Location: oxon Posts: 9,421 Thanks: 11 Thanked 288 Times in 262 Posts	Re: MOT Fail CO2 emissions An MOT friend told me when i had a problem on a car that was failing on the exhaust emmisions to put in double the amount of redex to recommended and take it for a 50 mile burn, push it hard so you can clean the system and remove crap. when you do get back to the mot station keep it running. __________________ Oxon Meet Feeler 2009 please add your input, click here

09-08-2008, 14:42	#6
k04 Briskodian Join Date: Nov 2007 Location: oxford Posts: 573 Thanks: 15 Thanked 16 Times in 14 Posts	Re: MOT Fail CO2 emissions When i emailed BlueFlame they sent one back saying that they only do 200cels cats now Is this true? It seems that every now and then this subject pops up about cars failing their MOTs because of the cat I want a BlueFlame Turbo back for mine but if this problem keeps arising now im having doubts __________________ CarbonioCAI - Forge Splitr dv - Leon CupraR Splitter - Black grille surround - To do: Turbo back Exhaust and remap (hopefully sometime) Black Magic V r s 187.2bhp Andy

09-08-2008, 17:53	#8
richm Briskodian Join Date: Jun 2006 Location: Melksham Posts: 534 Thanks: 3 Thanked 25 Times in 24 Posts	Re: MOT Fail CO2 emissions i have a very cheap 200cel Cat from the States in mine, passed no problem for the second time this year.. it will have to be properly hot to stand a chance. Are you certain there is no chance of an air leak between the engine and lambda sensor? That would artificially force a rich mixture. Do u get any fault codes logged in respect of Catalytic Converter System efficiency? I regularly get that, it seems to tie in with periods of extended idling when the Cat can cool down too much to work properly and the rear lambda sensor throws a benny, never turns the engine light on, just sets the code.

09-08-2008, 18:24	#9
Wayne Kerr Briskodian Join Date: Jun 2005 Location: NW Kent Posts: 931 Thanks: 9 Thanked 4 Times in 4 Posts	Re: MOT Fail CO2 emissions No air leaks on mine Rich. My 100 cel cat logs as Catalytic Converter System below efficiency & turns the engine light on after about 80 miles of 'soft' driving. With the loud pedal on ,,,,, it don't happen! Interesting fact has emerged here, if it's cold, it will fail. After several attempts on the CO2 measurment lark, the reading got lower each time! May try the Redex lark though. __________________ Deli G ,,,, leader of the Peckham Massif! KW Coilovers fitted, Forge TIP fitted, KK fitted, Blueflame full system fitted, CAI fitted, Forge 007 D/V fitted, PBVH4 fitted, Forge adjustable rear tie bars fitted, FMIC fitted, 312's fitted, Tints fitted. Was that a 4x4 Skoda??? It's IMPOSSIBLE! 197.2 BHP & 263.1Nm

09-08-2008, 18:59	#11
richm Briskodian Join Date: Jun 2006 Location: Melksham Posts: 534 Thanks: 3 Thanked 25 Times in 24 Posts	Re: MOT Fail CO2 emissions It is surprising how many minutes even a standard Cat may need at 3000rpm offload to get it hot enough to light off and work, a lot of garages are just not patient to wait long enough it's easier to say it failed and needs a new Cat. Because of the way it works, it's not a case of the readings dropping gently as it starts working, it will often be way out then suddenly drop as the Cat gets hot enough and lights off. The lazy MOT tester will see the readings not dropping after a couple of minutes and call it a fail. It will always help if you are able to give it some on the way to the test station and get the test done as soon as possible while the heat is still in the Cat.

09-08-2008, 19:06	#12
smstext 2.0 FSI Sport. Join Date: May 2007 Location: oxon Posts: 9,421 Thanks: 11 Thanked 288 Times in 262 Posts	Re: MOT Fail CO2 emissions the joys of while you wait mot places __________________ Oxon Meet Feeler 2009 please add your input, click here

09-08-2008, 20:51	#15
christaylor Briskodian Join Date: Sep 2006 Location: York Posts: 95 Thanks: 2 Thanked 3 Times in 3 Posts	Re: MOT Fail CO2 emissions looks like it might be worth giving it the beans then taking it straight for emissions test and then hoping that it just passes. __________________ Octavia vRS Mk1 55 Plate Corrida Red Blueflame turbo back exhaust 200 cell Cat, Carbonio C.A.I, Forge T.I.P, Forge Diverter Valve, Forge/Samco Hoses, N75-J Valve, Toyo Proxes TR1's and remap soon to come

09-08-2008, 22:02	#16
k04 Briskodian Join Date: Nov 2007 Location: oxford Posts: 573 Thanks: 15 Thanked 16 Times in 14 Posts	Re: MOT Fail CO2 emissions Good luck! Let us all know if it passes __________________ CarbonioCAI - Forge Splitr dv - Leon CupraR Splitter - Black grille surround - To do: Turbo back Exhaust and remap (hopefully sometime) Black Magic V r s 187.2bhp Andy

09-08-2008, 22:04	#17
martziniuk Need more power Join Date: Feb 2007 Location: Driffield, Good old yorkshire Posts: 1,944 Thanks: 54 Thanked 160 Times in 155 Posts	Re: MOT Fail CO2 emissions Its got along way to go to get down to 0.3 but good luck. __________________ Regards Martin Turbo back blueflame exhaust ,Forge 007p Dump valve,Prosport boost gauge, Autobahn88 TIP, Ecu Evolution Remap, FMIC

10-08-2008, 08:43	#18
fordfan ECUless Join Date: Mar 2005 Posts: 2,042 Thanks: 30 Thanked 241 Times in 210 Posts	Re: MOT Fail CO2 emissions What's the air filter like?, have you considered trying a fuel system cleaner? Also you are getting your CO2 (Carbon Dioxide) and CO (Carbon Monoxide) confused. CO2 for VED banding and CO for emissions.

10-08-2008, 10:53	#19
martziniuk Need more power Join Date: Feb 2007 Location: Driffield, Good old yorkshire Posts: 1,944 Thanks: 54 Thanked 160 Times in 155 Posts	Re: MOT Fail CO2 emissions I wounder if using 99 octane petrol would help the emissions? __________________ Regards Martin Turbo back blueflame exhaust ,Forge 007p Dump valve,Prosport boost gauge, Autobahn88 TIP, Ecu Evolution Remap, FMIC

10-08-2008, 23:26	#25
Bowders1 Briskodian Join Date: Apr 2007 Location: Hampshire Posts: 179 Thanks: 5 Thanked 22 Times in 21 Posts	Re: MOT Fail CO2 emissions I have Blueflame turbo back and could not get through emissions until I changed the lambda sensors. Now goes through ok. __________________ Skoda Octavia VRS - Mod's : BlueFlame Exhaust System Turbo back, Forge 007PDV, ABD Induction CAI, Remap, ECS N75 valve, Blue Silicon Hoses, Audi S3 Upper/Lower strut Braces, Whiteline Rear ARB, Weitec Hicon GT Coilovers, Audi RS4 18" Wheels, Polished Inlet manifold and Cam Cover, Poweflex Engine mount, Wishbone Bushes, ARB Bushes, SAT NAV install, Reversing Sensors, Bonnet Lifters, Seat Cupra R Splitter, Milotec Bumper Grills, Audi TT arch Mod, Airvent Boost gauge. to do FMIC.....

10-08-2008, 12:57	#20
christaylor Briskodian Join Date: Sep 2006 Location: York Posts: 95 Thanks: 2 Thanked 3 Times in 3 Posts	Re: MOT Fail CO2 emissions I use shell v power already and I use STP fuel system cleaner in the silver bottle so not sure what else I can do apart from get the cat super hot. Thanks fordfan yes i just realised that it is CO rather than CO2! __________________ Octavia vRS Mk1 55 Plate Corrida Red Blueflame turbo back exhaust 200 cell Cat, Carbonio C.A.I, Forge T.I.P, Forge Diverter Valve, Forge/Samco Hoses, N75-J Valve, Toyo Proxes TR1's and remap soon to come

10-08-2008, 21:53	#21
Funkoid Briskodian Join Date: May 2008 Posts: 115 Thanks: 7 Thanked 0 Times in 0 Posts	Re: MOT Fail CO2 emissions I'm putting my stock 55 vRS through for its first MOT tomorrow, you've put the fear of god in me now!!!

10-08-2008, 22:07	#22
k04 Briskodian Join Date: Nov 2007 Location: oxford Posts: 573 Thanks: 15 Thanked 16 Times in 14 Posts	Re: MOT Fail CO2 emissions should fly through mate,being stock and on a 55plate I wouldnt worry __________________ CarbonioCAI - Forge Splitr dv - Leon CupraR Splitter - Black grille surround - To do: Turbo back Exhaust and remap (hopefully sometime) Black Magic V r s 187.2bhp Andy

10-08-2008, 22:08	#23
Funkoid Briskodian Join Date: May 2008 Posts: 115 Thanks: 7 Thanked 0 Times in 0 Posts	Re: MOT Fail CO2 emissions .... there was me hoping to have an excuse to give it a "gentle" drive down the motorway tomorrow

10-08-2008, 22:23	#24
k04 Briskodian Join Date: Nov 2007 Location: oxford Posts: 573 Thanks: 15 Thanked 16 Times in 14 Posts	Re: MOT Fail CO2 emissions You still can! Gentle tho of course! __________________ CarbonioCAI - Forge Splitr dv - Leon CupraR Splitter - Black grille surround - To do: Turbo back Exhaust and remap (hopefully sometime) Black Magic V r s 187.2bhp Andy

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