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DS Automobiles DS 3

The supermini, sold as a Citroën until the badge was separated in 2014 — so half its community knowledge sits under the Citroën name and is worth searching for there. PSA engines throughout, which brings two facts that decide a diagnosis: the PureTech petrol's timing belt runs in oil and sheds debris into the pick-up rather than snapping, and the diesels carry a separate cerium additive tank dosing the particulate filter, with its own level and dosing codes.

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DS Automobiles DS 3
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