These sensors measure the air/fuel mixture ratio and adjust the engine parameters. If either of these are faulty you can have an engine light on, poor running or bad mpg.
Smartmods
for all your modding needs, recommended by Evilution
Kane Harrison
451 Lateral Movement Sensor
It's fairly rare for the lateral movement sensor (sometimes called the yaw sensor) to fail on the 451. However, this used to be the same case on the previous models but eventually they started failing. The biggest cause of it failing is due to water ingress. This is...
451 LCD Retrofit
For the 1st year (or so), the 451 came with a useful display on the speedo.
Unfortunately the dumbed down American display took over leaving us missing 2 piece of information.
Let us get it back.
451 Licence Plate Bulbs
How to change the bulbs that illuminate the licence plate at the rear of the car.
451 Lower Dash Removal
Remove the lower dash so you can have it recovered in leather or so you can remove the glove box insert.
451 Luggage Cover
The luggage cover for the new smart is really well thought out. Unlike the old luggage cover, this one retracts like a roller blind.
451 Luggage Tie Down Points
The 451 has the option (not standard) for adding tie down points in the boot. The OEM boot divider came with these. They are ok but not as strong as my other option. However, if you want these, look on eBay for "tie down rings" and make sure they can accept an 8mm...
451 MDC Cruise Control
In 2011 smart added cruise control as an option but it couldn't be retrofitted. If you want cruise control, you need an add on kit
451 Mirror Too Low
The 451 rear view mirror is too low, let us change it.
451 MP3 Lead
If your smart didn't come with an MP3 lead, you should consider buying one.
451 Mud Flap Fitting
Little arch extension flaps that keep the side of the car a little cleaner
451 OBD Pin Out
OBD Socket Location 999cc smart - in front of the driver's knee nearest to the centre of the car under the dash. The 999cc smart has a flap down cover that protects the socket. 999cc Smart Pin 1 No connection Pin 2 No connection Pin 3 No connection Pin 4 Negative...
451 OBD Wiring
Key:
E = Earth
C4/8 = Connection plug 4, pin 8
Fuse* or F* = Direct connection fuse number
Black Yellow = Wire colour
Modules are labeled in the picture.
451 OEM Navigation
The smart 451s sat nav is made by Garmin. The early set up (shown here) was based on a Garmin C510. The new updated version uses that same dock and wiring but uses a modified widescreen Garmin 760 navigation unit.
451 Oil Change
The new smart fortwo 451 has a drain plug like a standard car.
451 Paddle Coding
Ideally, you don't want the newest version of DAS. Generally anything before 2014 should work. Earlier the better but obviously still covering the 451. Newer versions have patched this out so won't work. Start up DAS and select Vehicle identification by control unit....
451 Paddle Wheel Doesn’t Work
Don't you just love it when smart changes the wiring for stuff for no reason.
451 Paddle Wheel Retrofit
Remove the steering wheel. Click. Plug in the new paddle shift steering wheel. Code the steering wheel paddles. Click. Still Doesn't Work? If you have bought a paddle shift steering wheel and the paddles don't work, it could be the wiring. Martjin D found that his...
451 Paddle Wheel To 450/Roadster
It isn't plug and play but in 2011 I fitted a 451 wheel to a Roadster to see if it could be done and to sort out any problems.
451 Panel Separation
If you damage one of the front or rear panels you will need to separate it from the others to fit a replacement.