So today we had this 2002 Peugeot 307 2.0 HDI 110 PS in for a diagnostic, after a quick test drive we hooked the vehicle up to our Peugeot Planet Diagnostic tool and scanned the engine ECU for faults. One fault was stored: P1448 (Intermittent fault. Particle filter. Particulate emission filter overloaded). This fault suggests that the DPF has become blocked, however a quick check on the DPF back pressure in live data confirmed this, at full engine revs we could see the differential pressure hitting over 400 mbar!