NCT failed on high CO. A new catalytic converter needed?

btree

Hi All,

My 2008 Toyota Yaris car has recently failed NCT at high CO. NCT results are as below:

Engine Temperature/Oil Temperature 0 C

Low idle CO 0.03 vol% Above 0.2 % PASS

(751rpm) HC 4 ppm Above 0 ppm NA

High idle Lamda: 1.00 Not Between 0.97 and 1.03 PASS

(2700rpm) CO 0.23 vol% Above 0.2 % MAJOR

HC 3 ppm Above 200 ppm PASS

I brought the car to a local garage and a guy said the CAT needs to be replaced with a new one, which would cost 450 EUR for part + labor.

Do you have any idea to reduce this CO reading for my next re-test? Because I think investing 450 EUR for this 12 years old car would sound not reasonable to me?

Please advise if you have any idea for me to pass NCT without a new CAT.

Thanks,
Bryn

richardsheil

btree wrote: »

Hi All,

My 2008 Toyota Yaris car has recently failed NCT at high CO. NCT results are as below:

Engine Temperature/Oil Temperature 0 C

Low idle CO 0.03 vol% Above 0.2 % PASS

(751rpm) HC 4 ppm Above 0 ppm NA

High idle Lamda: 1.00 Not Between 0.97 and 1.03 PASS

(2700rpm) CO 0.23 vol% Above 0.2 % MAJOR

HC 3 ppm Above 200 ppm PASS

I brought the car to a local garage and a guy said the CAT needs to be replaced with a new one, which would cost 450 EUR for part + labor.

Do you have any idea to reduce this CO reading for my next re-test? Because I think investing 450 EUR for this 12 years old car would sound not reasonable to me?

Please advise if you have any idea for me to pass NCT without a new CAT.

Thanks,
Bryn

Info says car was not warm.

Was the car warm actually?

Try a hard run and retest with hot engine.

btree

Hi,

Thank you for your info.

Do you mean, "Engine Temperature/Oil Temperature 0 C" can be understood as the car was not warm enough? I have zero knowledge about this.

I am not sure the car was warm on the test day. Distance from my house to the NCT test centre is around 7 km. It was tested on 03/Dec evening with a lot of rain and was cold on that day.

Would you think if I bring it to the motorway and run hard in 4th gear, would any chance to pass the test? A friend suggested me to put distanne into the tank before testing to reduce CO.

richardsheil wrote: »

Info says car was not warm.

Was the car warm actually?

Try a hard run and retest with hot engine.

Bmw123d

btree wrote: »

Hi,

Thank you for your info.

Do you mean, "Engine Temperature/Oil Temperature 0 C" can be understood as the car was not warm enough? I have zero knowledge about this.

I am not sure the car was warm on the test day. Distance from my house to the NCT test centre is around 7 km. It was tested on 03/Dec evening with a lot of rain and was cold on that day.

Would you think if I bring it to the motorway and run hard in 4th gear, would any chance to pass the test? A friend suggested me to put distanne into the tank before testing to reduce CO.

You could defo try bringing it for a hard blast up and down the motor way and see can you get it passsd but I had a girl same make and model as above fail her nct on the same and we just put and second hand cat into it and it went through no prob at all

greasepalm

I would also ask if car burns oil and if so can kill the cat.When was your last service done like plugs and air filter checked.
I always found Dipetane is a long time to reduce emissions and not like other cat cleaners which start to work as soon as its put into tank.

richardsheil

btree wrote: »

Hi,

Thank you for your info.

Do you mean, "Engine Temperature/Oil Temperature 0 C" can be understood as the car was not warm enough? I have zero knowledge about this.

I am not sure the car was warm on the test day. Distance from my house to the NCT test centre is around 7 km. It was tested on 03/Dec evening with a lot of rain and was cold on that day.

Would you think if I bring it to the motorway and run hard in 4th gear, would any chance to pass the test? A friend suggested me to put distanne into the tank before testing to reduce CO.

All the numbers for this car are excellent even the fail is marginal.. The hydrocarbons are low and with the lambda bang in the middle it is running well.

Catalysts work well when warm, hence the mention if running it until hot. The Dipetane idea is good. Get it in a motor factors.

So in summary, use dipetane for a while. Get your car really good and hot. Chance it for a retest

SCOOP 64

As above , take for a good run before test, 7km to the test Center wouldn't be that far.

delboythedub

greasepalm wrote: »

I would also ask if car burns oil and if so can kill the cat.When was your last service done like plugs and air filter checked.
I always found Dipetane is a long time to reduce emissions and not like other cat cleaners which start to work as soon as its put into tank.

Well worth a try and keep engine running while your waiting on the Tester.

greasepalm

0.2 is a hard limit to reach as we had a lancer fail on 0.23 and that model always had issues on oil burning and needing ex manifold cat and secondary cat and then could not say if it would pass,battery/starter motor and a very rusty sump were on the agenda,Scrap car as not worth putting money into it.

btree

Hi Folks,

Many thanks for all of your advices. I will take note all of them and try on re test.

I am going to put octane booster into the tank on the day of NCT and will drive very hard to make the engine hot.

I will report how it goes.

Many thanks again.

lawred2

Had a golf that failed with a CO of .21/22 no matter what I did... How hard I ran the engine before the test center or what I added to the tank..

Eventually gave in and replaced the front cat..

Whatever had been going on before I got my hands on it - the front cat had nothing in it.. just a pass through pipe.. mechanic said that some dickheads hollow them out for noise... This was a 1.4 slug..

Passed with a near zero score for CO after that

greasepalm

btree wrote: »

Hi Folks,

Many thanks for all of your advices. I will take note all of them and try on re test.

I am going to put octane booster into the tank on the day of NCT and will drive very hard to make the engine hot.

I will report how it goes.

Many thanks again.

Octane booster i dont think will do anything ,thinking was it circle K doing a better grade of fuel =more miles? Fuel cleaner in tank i would be trying with 1/4 tank of fuel.More potent the stronger the mix.

btree

Hi,

Yes, you are right. I was thinking about this too. I will try a combination of octane booster, washing the CAT, running very hard, and pump miles plus grade at Circle K this time to see if I could get a chance to pass.

greasepalm wrote: »

Octane booster i dont think will do anything ,thinking was it circle K doing a better grade of fuel =more miles? Fuel cleaner in tank i would be trying with 1/4 tank of fuel.More potent the stronger the mix.

greasepalm

You dont need octane booster,but a good fuel system cleaner.

btree

Would you be able to suggest for me one, please?

I have zero knowledge about which type of cleaner would work effectively.

Many thanks,

greasepalm wrote: »

You dont need octane booster,but a good fuel system cleaner.

greasepalm

Of the top of my head i cant as motor factors keep changing suppliers.
Tell them you want one to clean out fuel system eg,cataclean

https://www.youtube.com/watch?v=SO4rdSCSOqg

Tea drinker

SCOOP 64 wrote: »

As above , take for a good run before test, 7km to the test Center wouldn't be that far.

especially as it's freezing out there these days.

btree

Hi Folks,

So, I just re-NCT the car and she got passed on the emission test with the CO was 0.16% (previous reading when failed was 0.23%).

How I did was:

1) I gave her about 30 EUR premium petrol at a Circle K station.

2) I used a Denso Air Filter purchased (price 21 EUR) at a Toyota dealer. I compared this Denso Air filter with the After Market Air filter one (price around 6 EUR at Euro Carpart) I used and I found that the Aftermarket one was quite thick in comparison with the Denso one.

3) I did a few spins for "Italian tune-up" to make the engine really hot just before the test. I used the third gear and ran at 75km/h-80 km/h for around 20 minutes on a national road. When I arrived at the NCT test centre, I kept the car running. I could also hear the cooling fan turning on and off meaning that the engine was really hot.

I am unsure which practices I used above could help to lowdown the CO but she passed the test for CO at just 0.16% (limit is 0.2%). So, good to go for another year. :P

Thanks again for the advice, Guys.

btree wrote: »

Hi All,

My 2008 Toyota Yaris car has recently failed NCT at high CO. NCT results are as below:

Engine Temperature/Oil Temperature 0 C

Low idle CO 0.03 vol% Above 0.2 % PASS

(751rpm) HC 4 ppm Above 0 ppm NA

High idle Lamda: 1.00 Not Between 0.97 and 1.03 PASS

(2700rpm) CO 0.23 vol% Above 0.2 % MAJOR

HC 3 ppm Above 200 ppm PASS

I brought the car to a local garage and a guy said the CAT needs to be replaced with a new one, which would cost 450 EUR for part + labor.

Do you have any idea to reduce this CO reading for my next re-test? Because I think investing 450 EUR for this 12 years old car would sound not reasonable to me?

Please advise if you have any idea for me to pass NCT without a new CAT.

Thanks,
Bryn

djgarvey123

Just came across this thread. My car failed the NCT on emissions too. The CO reading was 0.43% which is more than double the limit of 0.2%.

For those who recommend the cata-clean, do you put it in on the day of the test and the be jaysus out of it, or should I put it in a few weeks out, drive the life out of her, and then give her another Italian tune up on the day?

btree

Hi,

I did not put anything in the tank, as I did the following:

1. I purchased premium gasoline (milesPLUS) at Cicle K before the tank was almost empty (I put in 30 EUR). I am unsure if MilesPlys provided any benefit but I just hope to reduce emission with better fuel at that time.

2. Just before the test for 1 hour, I brought her to a National Road and gave her a few Italian tune up at around 80 km/h (in fourth gear) until she was really hot. I could feel that by turning on the heater.

3. When I arrived at the test centre, I did not turn off the engine. Just let her run and I could hear the cooling fan kicked on and off, and that it was good for emission.

4. I also purchased an OEM air filter as I found that my aftermarket air filter was a little bit thick so just changed it to increase the change for her to pass emission.

So, she passed. All was good. All extra cost was an OEM air filter (22 EUR at a Toyota dealer) at this re-test.

I hope your car will pass the test. Try to keep her hot as the weather is really cold.

djgarvey123 wrote: »

Just came across this thread. My car failed the NCT on emissions too. The CO reading was 0.43% which is more than double the limit of 0.2%.

For those who recommend the cata-clean, do you put it in on the day of the test and the be jaysus out of it, or should I put it in a few weeks out, drive the life out of her, and then give her another Italian tune up on the day?