Change Car Rear Silencer Smart Fortwo

Change Car Rear Silencer

Easy 0h45–1h30 ~75–150£
Estimated time 0h45–1h30
Estimated labour cost ~75–150£
Difficulty Easy
Remove/refit the silencer 0h45–1h30
Renew the silencer 0h45–1h30
Repair the silencer* 1h30
Repair the front silencer* 1h30
Align the front silencer* 0h30
Repair the main silencer* 1h30
Align the main silencer* 0h30
Difficult main silencer removal* 0h30
Remove/refit the rear silencer 0h45–1h30
Renew the rear silencer 0h45–1h30
Repair the rear silencer* 1h30
Weld a sheet-metal repair panel onto the rear silencer* 0h30–0h45
Difficult rear silencer removal* 0h30
Remove/refit the rear silencer (2011 - ) 1h00
Renew the rear silencer (2011 - ) 1h00
Repair the main silencer 0h30
Align the main silencer 0h30
Repair the rear silencer 0h30

What is a Smart Fortwo rear silencer?

The rear silencer (also called the back box or rear muffler) reduces exhaust noise to an acceptable level. It is located at the end of the exhaust line, after the catalytic converter, particulate filter (if fitted), and sometimes an intermediate silencer.

When should you change the Smart Fortwo rear silencer?

No periodic replacement interval is specified. Carry out regular visual inspections for corrosion, holes, and deteriorated mounting rubbers. Signs that replacement is needed: louder exhaust noise, rattling from loose baffles, visible rust holes, exhaust fumes entering the cabin, or failure at the MOT/roadworthiness test.

Is it difficult to change the Smart Fortwo rear silencer?

Difficulty level 2/5: technically easy but may require effort if bolts and clamps are rusted. Key steps: raise the vehicle, apply penetrating oil to clamp bolts, remove the clamp connecting the silencer to the intermediate pipe, remove the mounting rubber hangers, fit the new silencer with new gasket/clamp, reattach mounting rubbers, check for leaks with engine running.

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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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View the service schedule for your Fortwo →