Has rhe same issue on the in laws citreon
It's as bodgit quoted the particulate filter will be blocked as the car will have failed to run through the cleansing cycle by on running short trips
At first I changed the ellinis fluid which is the stuff a citreon squirts into the mix during the cleansing cycle to raise the exhaust temp sufficient to burn the build up in the filter
Dealer quoted £700-800 for doing this!! I got a kit for £100 and did it myslef
Not saying that's yr solution though
You could try getting it really hot I.e run it in say 2nd gear up the motorway at full rpm right up to red line and hold it there for a good 10-15 minutes - only way it may get any near hot enough
Spoke to a mechanic I know (a very good one) and he said he had similar issues with other diesel cars and they r a right pain to sort
The chap that mentioned cutting it out n replacing with a piece of pipe has the easiest n best solution really - though that means more cost
Otherwise get straight onto trading standards but imagine it will end up in anoint drawn out process and it's obvious the garages are struggling to sort it anyway !
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