P2002 on Peugeot: causes and affected engines

2.0 HDi (1 fault), 2.2 HDi (1 fault), 1.6 HDi (1 fault) and 2.0 BlueHDi (1 fault). Each fault has its own page with the affected years and versions, the symptoms and the repair cost.

Diesel particulate filter efficiency below threshold (bank 1). The control unit checks whether the particulate filter (DPF) is retaining soot as it should: it compares the exhaust gas pressure and temperature at the filter inlet and outlet. If the amount of particles it captures falls below the minimum calibrated by the manufacturer, it stores the code. It is a generic OBD-II code: it means the same on a Peugeot as on any other make.^[1][2][4]

Garage soon. Mechanic Base rates it as medium severity: you do not need to stop immediately and you can get home or to the workshop, but you should not carry on like this because the car may go into limp mode with limited power. HELLA states that if the regeneration warning light stays on or flashes, the regeneration cannot complete and you need to go to a specialist workshop straight away to avoid serious engine damage. RACE advises against driving in limp mode because it increases pressure and temperature in the exhaust and can damage other components.^[1][5][6]