How to remove and replace the Roadster fuel pump
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Crankshaft Rotation Sensor
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.
45bhp CDI EGR Clean
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.
450 Alternator Change
The alternator is fairly robust but its open position means it is prone to seizing up. Let's sort it out.
Forfour Belt Tensioning
How to adjust the belt tension via the alternator.
Intercooler Fault
The intercooler seems to rub on the scoop causing it to wear through.
Hella 451 DRL Repair
The 5 per side Hella daytime running lights on the 451 where surprisingly poor quality and failed regularly.
451 DRL Options
Pre-Facelift DRLs The first type of daytime running lights available for the 451 was this type. They consist of a pair of Hella lights and surrounds. Smart part number A 451 820 00 61. However, if you buy them from smart, they'll be ridiculously expensive. So, do a...
Roadster Rear Light Faults
The biggest cause of rear lights not working on the Roadster is water damage and corrosion (surprise surprise). So, if a bulb isn't working, obviously 1st check that the bulb filament(s) are ok. Also check to make sure they are fitted correctly. Remove the bulb that...
Fitting A Better Horn
The Horn The standard horn fitted to all smarts isn't loud enough. It doesn't draw attention like it should. In fact, it's almost laughable and many people say it's like a scooter horn. There's a reason for that. That's exactly what it is. A single low wattage disc...
HID Headlight Interference
Radio Interference After HID Installation This is a fairly normal occurrence. The radio signal is fine until you turn on the headlights. But as soon as the headlights are on, you get loads of static interference over the music. What Is It? Radio stations are...
Roadster Indicator Faults
Roadster Indicator Faults It's surprisingly normal to hear Roadster owners come up against a strange issue along the lines of: 1 or both indicators come on and stay on when I indicate. 1 or both indicators come on and stay on when I turn the car on. 1 or both sides...
Roadster Speedo Dead
The speedo in the Roadster is beginning to suffer from a new common fault. Much like the rest of the Roadster, the speedo electrics are a weak point for a few reasons. Straight After A Battery Reconnect The story usually starts the same way. After reconnecting the...
453 Relay Layout
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...
Glow Plug Controller Fault
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...
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...
TIK Pipe replacement
TIK or Turbo Induction Kit was a name coined by Digitec,
Top Breather Pipe Replacement
Failure of the top breather pipe valve can cause excessive oil usage and engine smoke. It's cheap to replace so why not do it before it breaks?
450 Wastegate Actuator Hoses
The question of which pipe goes where has come up a few times and as a true pro I didn't have the faintest idea so thought i'd better find out.