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Diesel car failed CT on emissions - is there a way around it?

Diesel car failed CT on emissions - is there a way around it?

Old Aug 5th 2019, 11:50 am
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Default Diesel car failed CT on emissions - is there a way around it?

I have a reliable slightly older Citroen Picasso (French LHD, about 15 years old), bought back in the days when diesel was promoted as the greener alternative. I've never broke down in it, it's fuel efficient, and it's passed everything during its CT today, asides from emissions. The chap kindly ran the test four times but it failed. I'm quite amazed how any of these older cars I see on the road can get through. It's also disappointing because there's nothing wrong with the car, and so to scrap it for something newer is hardly any better for the environment.

I vaguely remember hearing that some people put an additive in the fuel, and ran their cars at high speeds (the garage is close to a dual carriageway) for a period of time before the test. Does this actually work, and can you tell me what the additive is, where to buy it, how much to apply, how long to run the car for, and how long is it effective for before the car is tested? It's worth a shot before I consider plugging up more landfill and buying something else.

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Old Aug 5th 2019, 3:21 pm
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Default Re: Diesel car failed CT on emissions - is there a way around it?

A few questions first.
i) What model of Picasso exactly?
ii) What is the mileage?
iii) What type of motoring have you done since ownership. Mainly around town, much or little frequent motorway use?
iv) Is the rear of the exhaust particularly sooty?
v) What maintenance have you had done since ownership? Injectors changed etc......
vi) Do you have a record of the failed emission value? Believe the limit is 1.80
What I would do: Try THIS additive or similar which cleans the injectors. Check the instructions well! Then go for a 40min FAST drive along the motorway. On completion, with the engine HOT, take the car for a further CT anti pollution check.
If this still fails, book the car into a competant Citroen garage to regulate the engine. They may change the injectors, which if the mileage is particularly high is recommended.
I'd be interested to hear of any others who have experienced similar CT emissions failure and their solutions.
Interesting related link for general info HERE. There are many like it, but - don't believe everything you read!!

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Old Aug 5th 2019, 3:27 pm
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Default Re: Diesel car failed CT on emissions - is there a way around it?

Thanks Tweedpipe, it's 2003 with a good number of km's on the clock! It has been used for long journeys in the past, although in the past couple of years it hasn't had much usage really. Yes, the exhaust could do with a decent clean, or even a replacement.
I will take it to a garage and see if there's anything they can do, but failing that I wanted to have a back up plan and try the additive as a last ditch effort not to have a perfectly functioning car being used as landfill.
Really appreciate the links, that helps a lot. My CT runs out in October so I've got a couple of months to see if I can get it passed.
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Old Aug 5th 2019, 3:39 pm
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Default Re: Diesel car failed CT on emissions - is there a way around it?

Also check out these 2 interesting videos.
Having never used the product I found the 2nd video particularly interesting, which would appear to confirm that it does a good job of restoring the emission values to acceptable limits.
One point to note. One of the two additives is added to the fuel tank which should contain no more than 20lts of fuel. Then one is instructed to drive until the fuel tank is emptied. NOTE: With older vehicles, running out of petrol may lead to future problems as fuel tanks do accumulate minor debris particles with age which can lead to fuel filter blockage. I'd prefer to watch the fuel gauge closely and stop before completely running dry.


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Old Aug 5th 2019, 8:30 pm
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Default Re: Diesel car failed CT on emissions - is there a way around it?

Thank you again, those videos are very helpful. I'm someone who never approaches close to empty, so I can let it go very low, but I don't want to be running on vapours!
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Old Aug 8th 2019, 7:57 pm
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Default Re: Diesel car failed CT on emissions - is there a way around it?

A couple of other things you could do - remove the air filter for the retest which would allow more air and help the combustion process, something I have done in the past with positive results. The other is a Terraclean treatment https://www.terraclean.fr/ which seems to be available in France. I have heard good things about it back in the UK but not had it done on my car yet. It is done by franchised garages,usually specialised in tuning or similar and I believe costs about £100 in the UK.

As a fellow driver of an "old" diesel car,I share your frustration of being pushed towards buying new and fail to see how a few more years of diesel burning can be any worse than the environmental footprint of building a new car. That includes electric cars, for which the batteries embody a huge amount of energy and all sorts of hazardous products. Luckily I have a friendly tester who bypasses the pollution machine to give a pass as required.
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Old Aug 16th 2019, 7:00 pm
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Default Re: Diesel car failed CT on emissions - is there a way around it?

Thanks South_bound, all useful information for anyone who comes across this thread.

I thought I'd give an update, as I took the car back to the garage and for 200 euros they replaced the exhaust pipe for a new one (the old one was on its last legs), took it straight down for a second test, and it's now passed without any problems, so that's a big relief. I think I heard that in June or July just gone, they updated some of the requirements for the CT, and the emissions test is a little more stringent than before, so it's a big relief to have passed.
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