12th Apr 2010, 01:16

Hi... my 2007 Citroen C4 has 150 000km on the clock now, and I too am now subject to the "anti pollution" fault, which will not go away. Here in sunny South Africa, due to ridiculously high costs, cat converters are simply removed and a dummy sensor fitted. Well, this has not worked either. The car splutters and spurts it would seem when the motor reaches operating temp. Checking today to get past the fault and fox the computer. Great car otherwise.. but then I am biased.. also driving a C5 and 1967 DS.

9th Jul 2010, 15:58

I have had depollution system fault twice, and both times were on the motorway driving relatively fast in the fast lane, and the motor cuts instantly, and both times almost got me killed. Comes without forewarning. Really scary to have a C4 Citroen. The second time it happened just before this weekend, I was returning home from work. At the side of the motorway I restarted the car and I could drive home. I drove very slowly.

Right now the car is at Citroen for repair. Guarantee has just gone out, but the first time it happened the car was new and they replaced a computer chip they said. Now I don't know how much it's going to cost. I'm not happy with Citroen. They should have recalled their C4s along time ago and fixed this dangerous problem.

12th Aug 2010, 09:28

I also had the depolution system warning about 6 weeks ago. My dealer told me it just happens in hot weather!? They reconfigured the computer and gave me a fairly hefty bill.

This week the warning is back and the dealer now says the fuse box beneath the engine needs replacing at a cost of nearly £300.

They also say it is safe to drive even though it keeps cutting out - I'm not convinced but it is our only car.

Not sure what to do if it happens again.

16th Aug 2010, 11:41

I had a problem once with my CV. I was coming round a corner out of a back road and all of a sudden the car just cut out. I didn't have a clue what was wrong with it. When the AA turned up they told me it was my coil pack, so I took it to the garage and they then told me it was the crankshaft sensor. I hope this is helpful to you.

I also have a problem of my own if anyone can help. Recently, my lights have dipped dangerously low and there's no adjustments in the car to raise them. I just want to know if anyone has had this problem and if so how much did it sting to get it fixed?

12th Oct 2010, 05:17

I have only just come across this C4 anti pollution faulty warning at 46K miles. It has not affected the car's performance, but having now read some of the comments on this fault, I am now worried (ignorance is bliss!).

The car is in for a service at the moment with this fault noted as one of the problems to look at. The others are an occasional fuel smell with the ventilation on, and occasional non starting of engine. For example, on turning the key, just a click is heard with no turn over of the engine and four or five attempts are needed before it starts.

I am awaiting the comments from the garage with interest.

21st Oct 2010, 15:05

I've been driving a C4 van for the last 4.5 years. I had the anti pollution fault pop up the day I picked the car up from the garage after a leaking injector problem. The car went back to the garage for 2 weeks; new turbo needed. Picked it up and drove home, all seemed fine.

Next morning, floored it down the on-ramp of motorway, strange whirring noise and had to limp to garage. New turbo number 2.

Other than that, the car has been faultless. I've done 172000km since new, and I drive it like I stole it.

Just wish the headlight bulbs would stop blowing, really annoying. You get one side fixed and the other side goes! Company van so I don't care!

New car next year, I'll miss her when she's gone, but I hope to god I don't get another C4!

9th Nov 2010, 17:25

I brought a Citroen C4, 57 plate in May 2010. I am a lady owner and now have only had the car for 6 months. When I bought the car, there was 16,000 miles on the clock, and now there's 23,000.

The car drove perfectly on my test drive, but now 6 months into owning the vehicle, the car is starting to have a really bad smell over this last weekend. It smells like rotten eggs, and is combined with an electrical smell. I took it to the Citroen dealer, and they think it may be the clutch, and that would be a cost of £300- £600 quotes! I have not got that money. I have read threads that similar smells are from the A/C? What is the likelihood of this, and any advice of avoiding such high costs etc? The clutch is not under warranty as it's classed as 'wear and tear', and I would have to pay if there was something wrong with it? Please help?

20th Nov 2010, 06:16

I have a C4 HDi, late 2005 model - thought I'd share my irritation regarding anti-pollution warning and the speed control.

First - anti-pollution warning - has happened to me so many times it's boring now. Car goes into limp mode. Switch off for 10 minutes and restart - limp mode reset, but service light still on. Alternately, disconnect car battery for a minute or so and reconnect.

Next - speed control / ESP warning. From new, the cruise control and speed control would fail about 1 out of every 10 times - Citroen SA found no problem and could not fix it.

5 years on - suddenly the ESP failed consistently after about 10 minutes driving - the cruise control and speed control would fail every time they were activated.

Citroen SA has replaced the sensor on the brake pedal, which seems to have fixed all the problems.

2nd Feb 2011, 08:22

My 2009 C4 is giving the anti pollution faulty message, and as a result, in the middle of the freeway in the fast lane, the car refuses to go... almost getting me killed.

I do respect the environment, but don't want to leave my kids this environment early. Does someone know how to disable this anti pollution connection? I am not prepared to spend over $1000 for a sensor.

10th Feb 2011, 16:42

If you find out anything about the anti pollution error, please post it. I have the same problem as the previous comment, but on a C4 1.6HDI from 2005. Please help!

12th Feb 2011, 16:44

Got a Citreon C4, the engine cut out whilst driving home.

Depollution light came on... engine restarted, light stayed on, got home OK... looking on other forums, there are lots of comments about this problem...

I think Watchdog should be informed..

28th Feb 2011, 12:33

I also have the Citroen 1.6 Hdi, late model. I too was on the motorway between Brighton and Lewes, when just after the anti pollution light came on, the limp mode came on and nearly had a serious collision up the rear!

I am going to complain to Watchdog this evening. Please join me if you feel compelled to take action; the more that do, the better chance of response.

We paid hard earned money to buy this car, and we should get some value for that!