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Premium Mod Lowering The Engine – 451451 Fortwo

This page covers tipping the engine to gain access to the pulleys and full lowering of the engine. Tipping The Engine As with other smarts, the access to the pulleys is restricted but tipping the 451 engine is a bit more tricky. Place a jack under the gearbox and...

Premium Mod 45bhp CDI EGR Clean451 Fortwo

Diesels are dirty engines, they are noisy but they are efficient. However, if they can't breathe then you aren't getting the best from the engine.

Premium Mod Crankshaft Rotation Sensor450 Fortwo452 Roadster

The crankshaft is what the pistons are attached to. The crankshaft sensor measures the rotation of the crankshaft (and therefore the position of the pistons) so the ECU knows when to inject petrol and to fire the spark plug.

Premium Mod 453 Relay Layout453 Fortwo/Forfour

Relay Layout Main Fuse Box (Behind Dashboard) F2 Relay Number Function Specification K1 Heated rear window & mirrors (G Cartier) 20 241 077 35 Amp max K2 Electric windows (G Cartier) 20 241 077 35 Amp max K3 Sliding roof power Not sure, should be the same as K4 I...

Premium Mod Glow Plug Controller Fault450 Fortwo451 Fortwo

Symptoms I have had the same email once or twice a year from 450 and 451 CDI owners. "My glow plug light doesn't go out" Normally I recommend replacing the glow plugs and checking the engine earth lead. Normally this fixes it. However, sometimes I get another...

Premium Mod PAS Controller Waterproofing450 Fortwo452 Roadster

Problems Another thing that dies due to water ingress in the Roadster is the power steering controller. However, it also happens in the fortwo 450 although it's much less likely. The reason for the issue is the placement in the cars. This unit sits low in the footwell...

Normal Mod 453 Horn Upgrade453 Fortwo/Forfour

Like all previous smart models, the horn is an embarrassment. A single unit that's far too quiet. What we need is a pair of tone matched horns (high and low frequency). Remove the front panel to access the main horn. It's just below the offside headlight... ...hidden...

Normal Mod Larger Throttle Body450 Fortwo452 Roadster

The original throttle body has a fairly small opening, bigger is better. For the smart 450 and Roadster ONLY. NOT 451.

Premium Mod 451 Coolant Drain451 Fortwo

Draining Unless you like to be scalded, wait until the car is cold. Remove the front service panel and undo the cap to the coolant header tank. Look under the car at the engine over to the right. Just behind the long drive shaft, partially hidden by some...