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Thanks for all the detail - I'm finding it enlightening! Maybe a dumb question, but if the ECU is ultimately controlling the turbo boost, why doesn't it simply back it off rather than create an overboost situation? Are there any implications I should be aware of tweaking the actuator arm...

Thanks for the info. Definitely understanding more and more how this actually works, rather than my prior assumptions. I'd always assumed that the ECU was involved in controlling turbo boost on variable vane turbos, but if I understand you and the info you linked to correctly, the turbo boost...

Should also have been clear that with the last lot of garage checks, all the fuel filters were checked again (for obvious reasons!)

Apologies if this ends up a bit of a tome, but I’ll attempt to fill in all the relevant (?) history. The vehicle is a 2006 D40 Navara, with the 2.5 turbo diesel engine, and it’s done around 250000km The problem first arose in early 2022, and is triggered when the vehicle is under sustained load...