Change Car Particulate Filter (DPF) Smart Fortwo
Change Car Particulate Filter (DPF)
| Estimated time | 0h30–0h45 |
|---|---|
| Estimated labour cost | ~50–75£ |
| Difficulty | Easy |
| Vehicles |
Fortwo 2007-2015 2
Fortwo City Coupe 1998-2007 1
|
| Check the catalytic converter | 0h30 |
| Check the diesel particulate filter | 0h30 |
| Remove/refit the diesel particulate filter | 0h45–1h30 |
| Renew the diesel particulate filter | 0h45–1h30 |
| Remove/refit the diesel particulate filter/catalytic converter assembly | 1h30 |
| Renew the diesel particulate filter/catalytic converter assembly | 1h30 |
| Prepare the catalytic converter heat shield for installation* | 0h45 |
| Remove/refit the catalytic converter | 0h45 |
| Renew the catalytic converter | 0h45 |
What is a Smart Fortwo particulate filter?
Diesel engines and direct-injection petrol engines produce soot particles. The particulate filter (DPF/GPF) traps these harmful particles as exhaust gases pass through its honeycomb structure. It is placed on the exhaust line after the catalytic converter.
How does the Smart Fortwo particulate filter work?
As soot accumulates, the filter periodically burns off (regenerates) the trapped particles. Active regeneration raises exhaust temperatures to 550–600°C, burning soot to ash. This occurs every 300–500 km during normal motorway driving. Vehicles driven only on short urban trips may not regenerate properly, leading to blockage.
When should you change the Smart Fortwo particulate filter?
The DPF is designed to last 150,000–250,000 km but depends on driving patterns. Signs of needed replacement: DPF warning light, engine in limp mode, excessive exhaust smoke, or diagnostic scan showing excessive back-pressure or failed regeneration cycles.
Can the Smart Fortwo particulate filter be cleaned instead of replaced?
Yes, professional DPF cleaning can restore a blocked filter at a fraction of replacement cost. However, if the filter substrate is cracked, melted, or structurally damaged, replacement is the only option. Never use a DPF removal/delete service — it is illegal and will fail the MOT/emissions test.
Is it difficult to change the Smart Fortwo particulate filter?
Difficulty level 2/5: technically straightforward but physically demanding due to the filter's location and weight. Key steps: raise the vehicle, disconnect pressure sensors, remove exhaust clamps/bolts, lower the old DPF, fit the new one with new gaskets, reconnect sensors, clear fault codes, perform a forced regeneration cycle.
3 models covered
| Model | Year Range | Engines covered | Fuel |
|---|---|---|---|
| Fortwo 2007-2015 | 2007-2015 | 0.8 CDi Diesel (660.950), 0.8 CDi DPF Diesel (660.951), 1.0 12V Petrol (132.910 (3B21)), 1.0 12V Petrol (132.910 (3B21)), 1.0 12V Turbo BRABUS Petrol (132.930 (3B21T)), 1.0 12V Turbo BRABUS Petrol (132.930 (3B21T)), 1.0 12V Turbo Petrol (132.930 (3B21T)), Electric Drive Brabus E… | Diesel, Electricity, Petrol |
| Fortwo 2015-2025 | 2015-2025 | 0.9 Brabus Petrol (281.910 (H4B)), 0.9 Petrol (281.910 (H4B)), 1.0 Petrol (281.920 (H4D)), 1.0 Petrol (281.920 (H4D)) | Petrol |
| Fortwo City Coupe 1998-2007 | 1998-2007 | 0.6 45 Petrol (160.910), 0.6 55 Petrol (160.910), 0.6 61 Petrol (160.910), 0.6 BRABUS Petrol (160.910), 0.7 50 Petrol (160.920), 0.7 61 Petrol (160.920), 0.7 BRABUS Petrol (160.920), 0.8 CDi Diesel (660.940) | Diesel, Petrol |
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