Emissions fail NCT

0066ad

Hi guys, car failed emissions test for the nct, it,s a 00 opel corsa
these are the results


low idle co 1.26vol% above 0.5 fail N/D
2,610rpm hc 99ppm above 0 ppm fail N/A


high idle lamdba: 0.97 not between 0.97 and 1.03 fail N/D
2,610rpm co 1.26vol% above 0.3 fail N/D
hc 99ppm above 200ppm fail N/D


I am useless with cars and i have no idea what these results mean
or what part should i get. I've heard you can get a fuel mixture to
mix with the petrol would that help reduce emissions this high. I would
be appreciate any advice.

0066ad

Any idea's? sorry to bump

Eddie Smart

Hi, your Corsa emissions much higher than limits, so any additives will not help. In most of the cases of emission fails catalytic convertor has to be replaced. The same job was done on my Mondeo'05 for 250 euro and then it passed nct. You can check your local garages.

El Guapo!

Start with the simple and cheap things first rather than going straight for the cat.

When was the last time you had the car serviced?
An excessively dirty/clogged air filter can cause high co readings.

Also things such as faulty lambda sensors and temp sensors could also cause it.

The first thing to do in my opinion would be to service the car if it needs one, give it a good hard drive and then check the emissions again. Also get the car checked on diagnostic equipment to check the correct operation of Lambda sensors etc.

0066ad

I don't know what was wrong with the inspector today, he also said the horn doesn't work correctly, i press the horn it works what does not correctly mean. He didn't check the headlights also said they were mounted insecure but there is only 2 bolts hold them on both were tight Almost everything on the cert says N/D not done Breaks and suspension passed

El Guapo!

0066ad wrote: »

I don't know what was wrong with the inspector today, he also said the horn doesn't work correctly, i press the horn it works what does not correctly mean. He didn't check the headlights also said they were mounted insecure but there is only 2 bolts hold them on both were tight

He may have made a mistake regarding the horn You should've asked what he meant by it so you could know if it need to be looked at or not.

The bolts at the top of the lamp may be tight but the lamp may not be secured elsewhere. Have a feel of them and give them a wiggle to see if they move around a bit.

El Guapo!

0066ad wrote: »

Almost everything on the cert says N/D not done

Did it fail on lots of things?
If it fails on one thing it may interfere with another aspect of the test. For instance, if it fails on a ball joint or wishbone bush then the wheel alignment will say N/D and will have to be retested.

0066ad

track rod end on offside front worn it says, but can't see anywhere else where for the lights to be connected. Thanks for your reply

dado76

hi there,just one question,I failed NCT on emission,says smoke 6.94 and limit was 3,went to guy who fix emissions and he told me to put 15 euro worth diesel and 5 euro worth petrol and give it a good drive,so i am a bit confused now,can you realy do something like that without damaging engine?

Andrewf20

Yep - Id defo do an oil change anyway if not done recently. High revs on the open road afterwards on a warmed up engine should help.

biko

Local garages might have an emissions reader so once you fixed everything, take it to have it read.
This way you'll know if there's more to fix before the NCT re-test.

jbv

Had 00 Corsa that failed on emissions. Changed the CAT converter €400 and failed again. MAF price €150. You need to make sure that they have the right tool to test the emissions after replacement.

Wolverine_1999

I recently failed on emissions also.. BMW. Took a reading off the engine and both Lambda sensors, and the MAF are reading 0 volts.

So these have to replaced first.. including an oil, oil filter, air filter and new spark plugs.

We'll see how things go then! My emissions were ridiculously high at over 3%

0066ad

jbv wrote: »

Had 00 Corsa that failed on emissions. Changed the CAT converter €400 and failed again. MAF price €150. You need to make sure that they have the right tool to test the emissions after replacement.

Thanks for your post, i changed the MAF, got it serviced and it passed today

Leonard Hofstadter

0066ad wrote: »

Thanks for your post, i changed the MAF, got it serviced and it passed today

Good to hear, just a bit of advice for anyone who fails the NCT on emissions - changing the CAT should be the last or one of the last things you do to bring down the emissions, not the first!

If the engine is running rich (lambda < 1) or running lean (lambda > 1) and you change the cat first before changing sensors then you risk destroying the cat (because the fuel/air mix will be wrong) and if you drive it for too long then you'll need to get another one!

Nissan doctor

As above, failed catalytic converters are a symptom of a problem in the vast majority of cases.

Just fitting a new cat may get the car through the emissions test in the short term, simply because its new, but the cause of the original cat failing hasn't been repaired and the new one will be knackered before the next NCT.

0066ad

Just thought I would post readings after MAF and service


low idle CO 0.20 vol% above 0.50% fail PASS


High idle Lambda: 1.02 not between 0.97 and 1.03 fail PASS
(3,060rpm) CO 0.20 vol% above 0.30% fail PASS
HC 32 ppm above 200 ppm fail PASS

Sizzler

dado76 wrote: »

hi there,just one question,I failed NCT on emission,says smoke 6.94 and limit was 3,went to guy who fix emissions and he told me to put 15 euro worth diesel and 5 euro worth petrol and give it a good drive,so i am a bit confused now,can you realy do something like that without damaging engine?

My car was put through the NCT for the first time yesterday, it was serviced a few weeks ago and all fine. Its a diesel and it failed on emmissions, the tester said I should give it a good drive and bring it back in for a retest...said he didnt think there was anything wrong with the car! I didnt know whether to laugh or cry! Then I read the above post! Seems to be par for the course?

Seriously WTF, how can you stand over the test if a drive is going to sort out the emmissions test!?!

I went and had the emmissions tested yesterday in a workshop and guess what, no issues!

Advice anybody? Did I just get punked by NCT or was it because the car wasnt warmed up? Only live a few mins from the test centre. If this is the case surely it calls into question the whole integrity of the test?

pred racer

Sizzler wrote: »

My car was put through the NCT for the first time yesterday, it was serviced a few weeks ago and all fine. Its a diesel and it failed on emmissions, the tester said I should give it a good drive and bring it back in for a retest...said he didnt think there was anything wrong with the car! I didnt know whether to laugh or cry! Then I read the above post! Seems to be par for the course?

Seriously WTF, how can you stand over the test if a drive is going to sort out the emmissions test!?!

I went and had the emmissions tested yesterday in a workshop and guess what, no issues!

Advice anybody? Did I just get punked by NCT or was it because the car wasnt warmed up? Only live a few mins from the test centre. If this is the case surely it calls into question the whole integrity of the test?

The test is supposed to check a car at its correct operating temperature.

Sizzler

pred racer wrote: »

Sizzler wrote: »

My car was put through the NCT for the first time yesterday, it was serviced a few weeks ago and all fine. Its a diesel and it failed on emmissions, the tester said I should give it a good drive and bring it back in for a retest...said he didnt think there was anything wrong with the car! I didnt know whether to laugh or cry! Then I read the above post! Seems to be par for the course?

Seriously WTF, how can you stand over the test if a drive is going to sort out the emmissions test!?!

I went and had the emmissions tested yesterday in a workshop and guess what, no issues!

Advice anybody? Did I just get punked by NCT or was it because the car wasnt warmed up? Only live a few mins from the test centre. If this is the case surely it calls into question the whole integrity of the test?

The test is supposed to check a car at its correct operating temperature.

Whats the correct temp then? Just checked result and it says 80 degrees...

Ded_Zebra

[Quote=
Whats the correct temp then? Just checked result and it says 80 degrees...[/Quote]

Normal operating coolant temperature is about 90 degrees.

You need to take your car for a 20 min drive on the motorway at 120kph in 4th gear to get it good and hot for the test.

The integrity of the test is not questionable.

Sizzler

Ded_Zebra wrote: »

[Quote=
Whats the correct temp then? Just checked result and it says 80 degrees...

Normal operating coolant temperature is about 90 degrees.

You need to take your car for a 20 min drive on the motorway at 120kph in 4th gear to get it good and hot for the test.

The integrity of the test is not questionable.[/Quote]
So its everybodys responsibility to have the car fired up or basically they will fsil your ass?

Nissan doctor

Sizzler wrote: »

So its everybodys responsibility to have the car fired up or basically they will fsil your ass?

Yes, all cars and all engines only operate efficiently when up to full operating temperature.


Its also well know that diesels, especially ones used mainly for city driving/shorter journeys, need a good high rev drive every so often to help clear any carbon build up/deposits etc.