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...
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PAS Controller Waterproofing
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...
453 Horn Upgrade
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...
The Camshaft
It's a multi-lobed shaft that rotates to open the inlet and outlet valves to the engine. The 600cc, 700cc and Roadster Camshafts are interchangable. Putting a roadster camshaft into a For2 increases the engine power.
451 Fuel Flap Solenoid
To remove the fuel flap solenoid, you have 2 options. You can take the rear panels off or leave them on. Rear Panels Removed If the panels are off, it makes it easy. Open the filler flap. On the back edge are 2 clips. They are very easy to push in by hand. Lever the...
451 Fortwo Speedo Cloning
Cloning The 451 Fortwo Speedo Cloning is a process where you take data from 1 item and copy it to another to make an exact replica. Why Would I Need To Do That? If your speedo has failed completely, has a hardware or PCB fault, you need to fit a new speedo. Can I Just...
453 Indicator Bulb Change
Small Access Panel Look into the front edge of the front wheel arches on your 453. You'll see a flap. Pull the tab down and pull the flap by the central finger hold. You don't need to jack the car up to gain access but if you need more room, go for it. Just steering...
External Temperature Sensor 451
The outside air temperature sensor is placed behind the front panel however, changing this sensor does not require the removal of the front panels. The sensor simply pushes in from the back of the lower air dam panel. You can reach the back of the sensor through the...
Roadster Boot Catch Fault
If your Roadster boot doesn't open from the switch or the key, you may have a faulty earth. It's a fairly common issue on the Roadster model. Firstly, make sure that all of the doors are closed and then try to lock the car with the key. If the car locks and then...
Roadster Central Locking Issues
Roadster Immediately Unlocks After Locking Back around 2009 I bought a fucked Roadster. The low mileage car was OK but it wouldn't start and wouldn't stay locked. The non starting was met with a CAN bus fault so I decided to check the continuity of every single wire...
Forfour Fuel Gauge Fault
What Are The Symptoms? If your fuel gauge on your 454 forfour is flashing, or the fuel level moves up and down for no reason, there is a good chance that it's a problem in the speedo. The issue is the same as we have seen in the dash pods on the 450 fortwo. Wide...
451 Rear Bulb Change
451 Coupe & Cabrio Replacing the lights on the new smart is a whole lot easier and quicker than before. Open the boot and look to each side, you will see a flap on each side. The offside flap (shown below) hinges forwards when the clips are pushed in (circled...
450 Fuel Flap Locking Solenoid
Fuel Flap Lock Solenoid Removal Remove the rear light on the fuel flap side. You do this by removing the 2x 10mm plastic nuts from the top and bottom of the side of the light. Hinge the light away from the car... ...and disconnect the wiring connector. You can now see...
453 Alarm Fault
Bob S was one of the many people experiencing the alarm on his 453 going off all the time. It's already a known fault at smart so we know the problem. The problem is the switch. The switch is pushed in by the bonnet (hood). If the bonnet is removed or tampered with,...
Unknown Green Connector
This question comes up about once a month where people have removed their engine and found a spare green single wire connector left over when the engine was refitted. Everything works but they want to know. Here is the green shrouded connector. It's a standard spade...
SAM Unit Clean
If your car electrics are being strange, your SAM could be wet and damaged. Cleaning the PCB can fix it.
454 Forfour Speedo Cloning
Cloning The 454 Forfour Speedo Cloning is a process where you take data from 1 item and copy it to another to make an exact replica. Why Would I Need To Do That? If your speedo has failed completely, has a hardware or PCB fault, you need to fit a new speedo. Can I...
450 Fortwo Speedo Cloning
Cloning The Fortwo Speedo Cloning is a process where you take data from 1 item and copy it to another to make an exact replica. Why Would I Need To Do That? If your speedo has failed completely, has a hardware or PCB fault, you need to fit a new speedo. Can I Just Fit...
452 Roadster ECU Cloning
Cloning The 452 Roadster ECU Cloning is a process where you take data from 1 item and copy it to another to make an exact replica. Why Would I Need To Do That? ECU's have been known to fail from water ingress, electrical damage from fitting the battery the wrong way...
450 Fortwo ECU Cloning
Cloning The 450 Fortwo ECU Cloning is a process where you take data from 1 item and copy it to another to make an exact replica. Why Would I Need To Do That? ECU's have been known to fail from water ingress, electrical damage from fitting the battery the wrong way...