Random Anti-Pollution Fault

[adamkent322]

Hello All

I have a 2001 C5 2.2 HDI Auto with 129,000 miles for a while now it has randomly come up with an anti-pollution fault  with engine and service light but this doesnt always appear and when it does its only after a couple of hours driving and doesn't appear the if the engine is left for atleast a couple of hours. I also (even less frequently) get a message telling me to 'unblock diesel filter' but no 'STOP' warning this warning disappears after 10 to 15 minutes. I was thinking that I needed the DPF filter replacing but some research yesterday is making me think that It might be the exhaust pressure sensor.

 

If anyone has any ideas they would be appreciated

 

Thank You

 

Adam

[paul.h]

You need to use a code reader to find out what the fault is since it could be a long list of many things, not just the dpf being blocked. Since your car is a pre 2004 diesel you may find most low cost code readers will not work on your car, so if buying one you should check first if it will work. Unblock diesel filter could also refer to the fuel filter as well as the dpf.

 

You can check your service history to see when the fuel filter was last replaced and to see when dpf eolys fluid was last topped up since it could be running out. Also check if it is being dosed by seeing if the diesel filler cap has the magnets in it. Also see when the dpf was last replaced or at least cleaned since it may be due.

[adamkent322]

Paul

 

Thanks for the reply. I hadn't thought of the fuel filter, so I'll look into that. The Eolys was done about 3 years ago and a forced regeneration of the dpf filter was done at the same time the car has done about 15,000 since then

[MikeLane]

I used to get this (but for some unknown reason it stopped a couple of months ago) and thought that maybe the Eolys needed topping up. I usuallly went out after a bit of hardish driving and the car never went into "Limp Mode".

I DID have a more or less permanent problem caused by a burnt out wire going to or returning from the filler cap so it never registered a refill so didn;t dose the tank.

[adamkent322]

MikeLane

Mike roughly how long did you drive it for?