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...
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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...
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...
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 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...
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 Throttle Body Wire Fault
A new fault is appearing on the 451 that can be fixed before it occurs
450 Keys Stopped Working
Both Keys Don't Work When I say "don't work", I mean nothing. Not even the indicators flashing 9 times. Sometimes both keys will be temperamental but both will either not work at all or work OK. Firstly, check that both key batteries are OK by fitting new ones (not...
Key Button Replacement
Key Tactile Switches The 450, Roadster and original Forfour use the same tactile switches on the key PCB. As with most things these days, they are probably the cheapest parts they could find for the job. They are low quality, have no internal dust protection and are...
451 Paddle Wheel Doesn’t Work
Don't you just love it when smart changes the wiring for stuff for no reason.
Airbag Delete Resistor
Maybe you keep having an airbag light come on, perhaps you have fitted an aftermarket steering wheel, maybe you are tired of the seat side airbag connections failing. Of course, there are other possibilities such as wishing to use aftermarket seatbelt reels or you...
External Temperature Sensor 450
The external temperature sensor is the device that relays the outside temperature to the speedo. It's wired directly. The sensor is just a thermistor which means that it changes resistance depending on the temperature. The resistance is then converted to a temperature...
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...