Is there a known issue with blocked injectors in the Citroen DS4?

I have a 2011 Citroen DS4, purchased two years ago. Since January, the engine light keeps coming on and the car will go into limp mode. I had the emissions filter 'fixed' in January by the dealer from whom I purchased the car and a blocked jet cleared in April by a garage who apparently specialise in clearing blocked jets, this has cost £1000 so far. The car has been into the dealers where I bought it twice in the last two weeks and I have just picked it up again today. They told me they did a 'regeneration' and that their computer showed a blockage in another jet which they cleared. I have just driven about 20 minutes and the engine light is back on. I am now at my wits end and don't know anything about cars so have to trust what they are saying. I'd be most grateful for any advice you could might be able to pass on to me when I approach the garage again.
I guess this is a 1.6 HDI 8v 115PS (you didn't mention the engine) and if so this engine is acquiring a terrible reputation for injector problems. It's possible that it may run better in the future on a Superfuel such as Shell V-Power Nitro Plus diesel that has various additives to keep injectors and valves cleaner. Diesel cars run for short distances and in towns also benefit from more regular oil changes, every year or every 6000 miles whichever comes first. They are then less prone to block their DPFs.
Answered by Honest John on

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