A forced regen should empty the filter straight off,
if it isn't you have an issue,
The regen temp should get to 650'c or around that on the post cat sensor, if its not then its a distint possibility you have a faulty 02 sensor,
altho it still might be worth pulling pipes off either side of EGR valve and giving it a clean, you can do quiet a good job without actually having to remove it as there abit of a pain to get off
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04 XC90 D5 --- Big bus
00 pug 306HDi --- Run about
88 pug 309GTi --- Project track car
07 CB600 Hornet --- 2 wheel fun
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