Why Does Ford Transit Still Have Blocked DPF After 4 Mechanic Visits & Various Parts Replaced?

Launchtech.co.uk look at why this vehicle was looked at various times but failed to fix the issue and also explain other common causes of constant diesel particulate filter blockages fault codes P244C:00-28 Exhaust Temperature Too Low For Particulate Filter Regeneration P2463:00-AF Particulate Filter Restriction Soot Accumulation P246C:00-AF Particulate Filter Restriction Forced Power Limit