Major Problems With My C8

[dazzera]

hiya all ,lost all my pc files and the site too , well heres an  update for yous with the c8 2005 2.0 hdi , well from my last post i have now had the dpf changed , prior to this the unblock diesal light came on then limp mode , only just noticed that when that happens if you touch the exhaust pipe at the back of the car its RED HOT which burns you when you touch it ,something not healthy there , so anyway changed the dpf , new diesal filter , wynns diesal clean-up straight into the filter housing , started car lasted 10 mins and back to limp mode , has the fault codes reset only , and they cleared , took car out again was fine for about 10- 15mins as soon as i hit 70mph, unblock diesal filter, then limp mode , drained excess water from diesal filter from underneatch the filter tried again , got on open road for 3 or 4 miles foot down and back again ,no faults , another 2 miles speed at 30mph ,unblock diesal filter , limp mode again , so today my mechanic has filled up the additve chamber , and we have replaced the fuel regulator switch , took back to garage to clear codes , woudnt clear the particulate one , advised to get on mway wen limp mode has gone off , and open it up , so i went to see a citreon specialist garage told me to come back tommorow, gets in my car on unblock diesal filter nor limp mode out of car 10 mins max , drove round city for 5 miles , decided to put on mway did 12miles in 4th gear to open it up and back down the mway same again 4the gear all way to redline and down then back up to a steady speed , gets home not unblock diesal filter nor limp mode came on , strange , went to my mechanics house he cleared codes , codes found F1447 PARTICULATE FILTER, PO101 AIR MASS SENSOR CIRCUIT AS WELL AS C1136 STEERING ANGLE SENSOR SIGNAL  only codes on so we reset codes and all clear , touched rear exhaust pipe cool as a cucumber, "happy days" beed booting it here n there tonite were i can powers there and better fuel efficeny , took my m8 home and on way back on dualcarriageway 4th gear up to 70mph, unblock diesal filter limp mode AGAin , checked back pipe again RED HOT , desperatly need help on this 1 ive run outta money 400 pound later,the only other thing i have found is ther is a leak to the exhaust at the manifold, you can see the black carbon on exhaust tomoz i will get it re sealed , now can anybody help me more on this , it would be much appreciated thanks 

 

[BigBruv]

I had the same problem. I replaced the DPF and still kept on getting the unblock diesel filter error. Kept clearing the code and it came back after a few mins. All I had to do was replace the vacuum sensor which has the two tubes that go into the DPF. Fixed it.

[Simple]

Can you elaborate on the location and shape of the vacuum sensor, I am getting occasional gear fault (Limp mode). I changed the Transmission Oil, but I still got one gear fault error in a month.

 

Funnily, this fault seems to occur in the same road location (a bend as I am entering the motorway) and on damp days!!. I Stop the car on the side of the road, switch off , switch on and all is fine until the next fault. I suspect a sensor that is affected by centrifugal movement and/or weather conditions.

 

French cars makers should include service by an Exorcist or African Black Magic Doctor within their dealerships.

[Gilbern Invader]

Vacuum sensor close to DPF follow rubber pipes to it, just behind battery box. Check exhaust temp sensor is connected as well, between DPF and CAT,

[Gilbern Invader]

Before replacing sensor would be worth disconnecting rubber pipes to it one at a time (don't get them mixed up!) and blowing down them to confirm they are not blocked with soot from the exhaust.

[Witt0018]

Hi, not sure if this will help you....

 

When you replaced the dpf, did you reset the parameters in the ECU?

 

The ECU will need to be told that the dpf is new or has been cleaned, as it ages the pressure sensors allow the ECU to learn the condition of the dpf, when it's replaced there is a sudden change in the pressures, unless the ECU is told this is a new dpf, then it will take this as being a fault and will give the airflow and dpf faults in the code read.

 

To reset the ECU you will need to get the car onto a suitable diagnostic reader which has the ability to reset this, such as texa, Bosch or citroen software, or a similar good quality machine.