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C6 Depollution system failure
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mark28   
Mon Oct 10 2011, 04:15pm
Joined: Apr 28 2010
Member No: #102
Location: Hampshire
 Well for the first time since owning my car I think I have found a garage that I can work with and trust . My car might be fixed but might not . The Egr valve has been cleaned and front and back swapped. Now I need to see if it comes on again then the fault has been identified. Technician spent 20 mins on the phone to me and will also talk me through a Citroën Uk bulletin that was sent to dealers re this fault . Will update tomorrow . I am going to use the ds3 I have been leant for a trip tonight .
mark28   
Thu Oct 27 2011, 05:45am
Joined: Apr 28 2010
Member No: #102
Location: Hampshire
 Update . The fault came back and it was a faulty EGR valve. This was replaced and is all now fine . The nice man also showed me the fault on the computer and what was happening under acceleration . The car drives better and also is giving me a few more MPGs . This fault was common enough for Citroën to issue a "service bulletin" which I was also shown . A detailed flow diagram with each possible cause of this fault and the cure .
michaelb   
Thu Oct 27 2011, 12:15pm
Joined: Nov 17 2009
Member No: #14
Location: London
mark28 wrote ...

Well for the first time since owning my car I think I have found a garage that I can work with and trust .


Go on, share their name with us
SGC   
Wed Oct 17 2012, 08:21pm
Joined: Oct 16 2012
Member No: #1062
 Apologies for resurrecting an old thread, but would like to ask for advice.

My Depollution System Faulty warning comes on straight away after switching on the engine, however I get no loss of performance and the emissions are within tolerance and my cruise control works fine.

Car was serviced today and the garage confirm that the fuel filter didn't need changed.

They have however suggested the use of an additive to aid the burning of the particulate

Any ideas?
gmerry   
Wed Oct 17 2012, 09:00pm
Joined: Dec 11 2009
Member No: #21
Location: Scotland
 Not sure why you would add an additive. Citroen FAP system already has one (on every C6 diesel).

On the Fuel Filter thing, how does the garage know it doesnt need to be changed? Just curious
SGC   
Wed Oct 17 2012, 11:17pm
Joined: Oct 16 2012
Member No: #1062
gmerry wrote ...

Not sure why you would add an additive. Citroen FAP system already has one (on every C6 diesel).

On the Fuel Filter thing, how does the garage know it doesnt need to be changed? Just curious


Not sure

He told me upon visual inspection it didn't need changed. Is this possible? (Didn't challenge him - hmmm)
cruiserphil   
Thu Oct 18 2012, 07:48am

Joined: Jan 24 2010
Member No: #38
Location: Celbridge
 SGC,

Is the depollution system failure message on a while or since it was serviced? The reson why I ask is that normally two sensors have to be unplugged to change the air filter. If these are not connected correctly you will get the message. This happened to me when I forgot to put the plug back on one sensor.

I agree with G on the fuel filter. You would need to open up the housing to inspect it and then it would seem a waste not to change it anyway.

Regards,

Phil C.
SGC   
Thu Oct 18 2012, 08:44pm
Joined: Oct 16 2012
Member No: #1062
 Hi Phil,

Yeah the message had been on for a while. Previous garage told me it would clear itself over time as the particulate burned off.

Might have to download a manual and search for the sensors.

With the filter I think it had been missed off the service. They had quoted me a price to service the car and fit a drop link, upon further inspection it needed two links but they didn't charge me any more.

Scott
cruiserphil   
Fri Oct 19 2012, 08:45am

Joined: Jan 24 2010
Member No: #38
Location: Celbridge
 Scott,

The fact that there is a fault message means that there should be specific fault information available for interrogation by Lexia that might lead to a specific component.

Regards,

Phil C.
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