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Depollution fault
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Julian   
Sat May 31 2014, 01:40pm
Joined: Jun 28 2013
Member No: #1346
Location: Hampshire
 Periodically, my car warns me of a depollution fault and the yellow 'engine' light comes on. Nexia says it is an intermittent fault and allows the fault code to be erased. No change in performance. Any ideas?
C6Dave   
Sat May 31 2014, 03:37pm

Joined: Oct 01 2009
Member No: #1
Location: Northumberland
 Could be anything as it's a 'generic' message. It needs the actual fault code to try and be more specific....
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Julian   
Mon Jun 02 2014, 06:54am
Joined: Jun 28 2013
Member No: #1346
Location: Hampshire
 From memory (mine, not the car's) faults with both airflow meters, EGR valve and exhaust recirculation
gmerry   
Mon Jun 02 2014, 07:01am
Joined: Dec 11 2009
Member No: #21
Location: Scotland
 Julian, whats the service hoistory for the car? Do yoo know if mid/low SAPS oil has been used for each and every oil change?

Regarding the airflow meters, these are easily accessible/changed so you might want to tackle these first before looking at the EGR valves.

Your Nexia (Lexia?) can read parameter values, you want these values and access to 'scope to definitively trouble shoot.

Regards
G
gmerry   
Mon Jun 02 2014, 08:29am
Joined: Dec 11 2009
Member No: #21
Location: Scotland
 Julian, in case you decide to go down the route of replacing the airflow sensors (these items do not have infinite life anyhow), the following may be helpful.

For 2.7HDI

Citroen part number 1920GN VDO 5WK97001Z. They are listed at about £95 each from a factor (might be cheaper from Citroen?). Both sensors, for front and rear cylinder banks, are the same. Swopping the parts around sometimes works if one bank is playing up.

Regards
G

NB, I looked on the Europarts website and ignoring the cheaper pattern parts, there appears to be two VDO variants listed with different diameters. Citroen only show one size for the 2.7HDi. Normal story with wrong information at Eurocarparts - I only ever parts from them if I can order by the OEM suppliers catalogue number



Extra Note, the same VDO airflow sensor is used across the PSA range for vehicles fitted with the 2.7HDiFAP and also lots of 2.0HDi C4s and derivatives, so it might be possible to arrange for a component swop with a Citroen or Peugeot garage or failing that, there are heaps of suppliers out there.
Hattershaun   
Mon Jun 02 2014, 03:27pm
Joined: Dec 19 2010
Member No: #320
Location: Bedfordshire, UK
 Hi Julian,

You should find in the service history that both airflow sensors were changed for new genuine parts, whilst. I owned the car.
I still have the old ones, which I believe we're working perfectly well.
The running fault, slight hesitation on acceleration at 1750rpm, ending up being cured by replacing one of the EGR valves. I just left the new airflow sensors in place.
You're welcome to try the old sensors if you wish, I'll be at the DS rally this Sunday coming.
Julian   
Mon Jun 02 2014, 04:06pm
Joined: Jun 28 2013
Member No: #1346
Location: Hampshire
 Thanks Shawn - I saw that. Could you email me the summary of work done (if you still have it) - I thought it might be worth adding the few jobs I have (had) done?
My local specialist also reckons cleaning the air filters will do no harm - he says he had another C6 with the same generic fault and doing this cured it. I shall switch the two sensors on Thursday and if that doesn't work, I will take you up on your offer - wasn't intending going to the DS rally but...
Replaced the rear ABS loom - that was fun - ended up 'phoning Robert Lowdell to discover where the connector is (above the fuel tank).
Hattershaun   
Mon Jun 02 2014, 11:38pm
Joined: Dec 19 2010
Member No: #320
Location: Bedfordshire, UK
 I saw Robert tonight and mentioned your car's 'fault'.
He thought the wiring to the Eolys Fluid tank could have been disturbed if the main fuel tank has been removed to replace the ABS sensor, maybe the computer thinks there's no Eolys!
Yes, I'll look up the history for you and send. I think a print out was in the file.
Julian   
Tue Jun 03 2014, 06:14am
Joined: Jun 28 2013
Member No: #1346
Location: Hampshire
 Thanks for that, Shaun. Certainly worth checking - although the fault first occurred before I dropped the tank - didn't actually remove it - just lowered it and supported it on a jack.
Yes, there is a print out in the file.
Julian   
Thu Jun 05 2014, 08:35am
Joined: Jun 28 2013
Member No: #1346
Location: Hampshire
 Well, I have switched the two air sensors and also cleaned the air filter - which was sopping wet on one side - guess that's caused by driving through standing water. Squeezed out the water and left it on a radiator to dry out. Cleared the faults and, touch wood, all is okay. No need to bring the sensors along on Sunday, Shaun.
gmerry   
Thu Jun 05 2014, 09:32am
Joined: Dec 11 2009
Member No: #21
Location: Scotland
 Hi Julian, regarding your fix to the rear ABS wiring, partial dropping of the fuel tank etc, do yoo have any photos, hints or writeup you could share with forum members. Thanks G
Julian   
Thu Jun 05 2014, 11:12am
Joined: Jun 28 2013
Member No: #1346
Location: Hampshire
 No photos I'm afraid. I put the car on a ramp, put a very long pillar jacj under the tank, removed tank fixings and then lowered the jack/tank sufficiently far to enable me to undo the old loom from the connector and fit the new one. It helped that the tank was nigh on empty.
gmerry   
Thu Jun 05 2014, 03:35pm
Joined: Dec 11 2009
Member No: #21
Location: Scotland
 Hi Julian, sounds straightforward. Did you loosen the exhaust mountings or remove the rear section of the exhaust completely?

If you did the job with the exhaust in-situ, was this for the LH or RH ABS sensor? Would it make a difference?

Also, did you have to remove the rear seat and disconnect the fuel line and wiring?

Thanks
G
Julian   
Thu Jun 05 2014, 04:38pm
Joined: Jun 28 2013
Member No: #1346
Location: Hampshire
 It was the LH rear sensor. Wouldn't think it would make a difference were it the other side.
I left everything in situ - just dropped the tank far enough to get at the connector.
Looked at removing the rear seat - but decided against it.
Julian   
Thu Jun 05 2014, 04:42pm
Joined: Jun 28 2013
Member No: #1346
Location: Hampshire
 Well, the depollution fault returned after a fairly brisk 20 mile drive with no faults. Parked it for a couple of hours… and when I started it up, PING!

Back to the drawing board.
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