I had my DPF removed after 5 years, 180,000 miles due it being permanently blocked.
A local garage removed it and smashed the internals out which consisted of a pre-cat and DPF and a pile of soot.
They then refitted it and had it remapped with DPF delete by a mobile agent.
The DPF measuring blocks in VCDS are just blank now.
There was never any smoke when the DPF was working and the tailpipes were still clean inside after 180,000 miles but it is the same as a Euro 3 car now, smoke seen in the mirror when accelerating swiftly and soot in the exhaust tips.
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