The 2.0. Hdi doesn't have a DPF but the 2.2 does.

Yes i too would be changing the filter, but be aware some PSA filters are fitted with a heater that some might try to sell you as one unit with the filter (which isn't cheap on its own), heater fitment does unclip and can be swapped over easily enough but the filter you buy can look completeley different from the one fitted, i expect this puts some DIYers off.

Have you tried draining any water from the filter first, i don't know if there would be a specific 'water in filter' dash message.

Before you touch the filter at all make sure the primer bellows works (squeezing it a couple of times you should feel it pressure up if good) so you can prime the filter afterwards, its usually possible to pre fill the filter with clean fuel before fitting which helps, but don't know if this is the case on your car.

There are two versions of the 2L diesel, the 90 without DPF and the 110 with.

There are no sensors on the fuel filter to notify the ECU of issues with it, you'll "feel" them first - difficult starting, cutting out, low on power.

Personally I change the fuel filter every 12,000 miles. They're only a fiver so its a no-brainer.

And the 110 has an in-tank fuel pump, so there's not necessarily a hand-priming bulb in the engine bay.

Don't throw money at a new DPF when it might not need it. It could be something else which has blocked it - namely the car not generating because of issues with the glow plugs, glow plug relay, missing fuel cap sensors, empty additive tank or non functioning radiator cooling fan, even a dirty fuse for the additive system will stop it from regenerating and cleaning the DP filter.

A Lexia - Planet diagnostic and nothing else will definetly tell you if there's anything wrong with the system, don't waste your time with generic code readers.

If you need a new DPF, try CATS2U.

Edited by Gibbo_Wirral on 02/12/2013 at 14:26