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Depollution System Faulty


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#1 skaramanga

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Posted 08 November 2006 - 09:10 AM

When driving along at the weekend the car bleeped and a warning "Depollution System Faulty" came up, along with a yellow warning lamp. Later on that day when I started the car again it was back to normal.
Yesterday it happened again, was also on all morning on my way to work, but I went out a few minutes ago, started the car and all is well again.
Has anyone else experienced this?
Thanks
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#2 Johndouglas

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Posted 08 November 2006 - 10:57 AM

If your car is fitted with a particle filter in the exhaust system, it may be getting blocked. The warning comes on at such times. Although it disappears after switching off, it will come back again. Ignore it for too long and the engine will go into limp mode.
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#3 Seefour05

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Posted 08 November 2006 - 12:45 PM

I had this on mine. Started it one day and it sounded very rough. Was shaking quite a lot too. Turned the car off and on again and it was fine. Took it to my dealer who connected it to the computer. He said it was showing some 'Ghost' faults but there was nothing wrong. Hasn't happened since though. He did say that if it happened again, I should take it back and they'd update some software.
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#4 skaramanga

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Posted 15 November 2006 - 12:41 PM

Went into my dealer to get it checked on the computer, light wasn't on at the time. Took them two hours to diagnose it! It did show up as a turbo pressure sensor at fault though, so they are ordering the new sensor as we speak (type).
Hopefully thats it sorted :unsure:
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#5 philH

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Posted 17 November 2006 - 11:45 PM

My C4 has just gone back in for the third time with this problem. I am told that the turbo is overboosting!!!!!! and they have ordered a new turbo under warranty along with new glow plugs. Will be interesting to see if this cures the problem.
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#6 skaramanga

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Posted 18 December 2006 - 12:40 PM

Got the turbo pressure sensor changed a few weeks ago, seemed to be sorted, but now the same problem has returned!! Have to go back in again. :angry:
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#7 Guest_BUNHEAD_*

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Posted 27 September 2007 - 10:36 AM

When driving along at the weekend the car bleeped and a warning "Depollution System Faulty" came up, along with a yellow warning lamp. Later on that day when I started the car again it was back to normal.
Yesterday it happened again, was also on all morning on my way to work, but I went out a few minutes ago, started the car and all is well again.
Has anyone else experienced this?
Thanks

IVE HAD THIS PROBLEM WITH MINE, BEEN BACK TO DEALER 3 TIMES THEY DONT KNOW WHATS WRONG WITH IT THEY SAID THEY'VE DONE THE USEUAL THINGS. I'M REALLY FED UP ITS COST ME MONEY GOING BACK OND FORTH AND PAYING FOR HIRE CARS. MINE IS A 1.6 PETROL.

#8 ericc4

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Posted 23 October 2007 - 09:06 AM

My car is a 1.6HDi VTR+ and at 10,000 I had my first service (early as I don't think 20,000 on the same oil is a great idea and also it "only" costs £100 in Spain - still a rip-off for what is little more than an oil change)
I then drove the next day from Alicante to Bilbao to catch the ferry and about 20 miles befre Bilbao the depollution warning appeared. The car ran normally. I stopped at the next petrol station and filled up and checked the handbook which said I should take car to a Citroen agent urgently. Whe I re started the warning was still on. I got to the ferry and had about four hours to wait for loading. When I restarted to board the ferry there was no longer any warning. It has not re-appeared since.
I wonder whether it is a coincidence that the car had just been serviced (when, incidentally, I later discovered that the end of the dipstick had broken off in its tube) - My next message will deal with that.
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#9 BigJohnD

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Posted 30 October 2007 - 01:16 AM

Although I have not experienced it myself, the depollution warning can often be cleared by some hard driving, sometimes known as the Italian tune up.

The end dropping of the yellow plastic dip stick is well known. I understand when this was first noticed, CitroŽn would remove the sump in an attempt to remove any pieces and so prevent any oil ways getting blocked. Seemingly no pieces have ever been found and so they just replace the dipstick without question, advising the owner no to worry.

It happened to me some 4,000 miles ago, and there has been no problem

Broken dipstick
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Correct/replacement dipstick
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#10 Johndouglas

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Posted 30 October 2007 - 09:00 AM

Just beats me why they have to use plastic. What's wrong with a strip of steel like they've used in thepast?
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#11 BigJohnD

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Posted 30 October 2007 - 01:16 PM

Just beats me why they have to use plastic. What's wrong with a strip of steel like they've used in thepast?

Good question.

The route the dipstick takes is unnecessarily convoluted. It would require a whole new dipstick guide/sleeve to take a simple steel one. But it does beg the question why was it designed like it is.

There's a thread in C4Owners.org where owners get out their dipsticks and photograph them.
(They can't arrest you for it)
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#12 Guest_Dommo22_*

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Posted 08 October 2008 - 11:27 AM

IVE HAD THIS PROBLEM WITH MINE, BEEN BACK TO DEALER 3 TIMES THEY DONT KNOW WHATS WRONG WITH IT THEY SAID THEY'VE DONE THE USEUAL THINGS. I'M REALLY FED UP ITS COST ME MONEY GOING BACK OND FORTH AND PAYING FOR HIRE CARS. MINE IS A 1.6 PETROL.



I have also experienced the same problem with the depollution system light, but initially when it broke the car also had no power, so I took it to Citroen....first time i went in they told me that the car required a new turbo, since it had only done 30,000 miles and is just out of warranty I was offered good will money, so reluctantly had the work done. When I got a call the next day to say I still couldn't have the car back because they had fitted another faulty turbo I asked for the car and the old turbo back to get a private garage to recondition it and fit it since it would be cheaper still. Citroen said I could not have the car till I paid the 1300 pounds for the work. Once solicitors became involved they offered to replace the turbo for free again.
This work was carried out and the car came back running brilliantly, but sure enough 20miles on and the light appeared again. I've been in 5 or 6 times since and had the particle sensor changed, it's had engine management looked at, and various other things changed but the light keeps coming on and going off. I've run some redex injector cleaner through it recently and the light has stayed off since, but I have to hold my breath every time I turn the car on...it has not yet come on again even though the mechanic now thinks it needs a new particle filter.
Will keep you posted about this nightmare though. Hope that's been of some use.

#13 Guest_bessy765_*

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Posted 12 April 2011 - 05:44 PM

Hi I have a 2007 (57) C4 Grand Picasso 38576 miles. eml came on and system said Depolution fault dpf blocked. reset eml fitted new dpf unit £320 fault light came on after 6 miles message read Depolution fault (Help)