Kane Harrison

451 Horn Upgrade

The 451 standard horn is embarrasing, sort it out.

Remove the SE Drive cover and look into the base of the ignition barrel. You'll see a tab. This tab is locked in the outward position and holds the barrel into the housing. Put your key into the ignition... ...and turn it 90 degrees clockwise. Stick a screwdriver into...

451 Interior Handle Removal

How to remove the handles to change the window switches.

451 Interior Light 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 Key Fob Battery

Batteries don't last forever so instead of getting locked out of your car, let's change the battery for a fresh one.

451 Key Resync

Issue I found that if you don't use one of your 451 keys for a long time and the battery runs out, when you refit a new battery, you may find that the key still won't unlock the central locking. Fault Or Security Feature? Unknown but at a guess, I would say it's a...

451 Lambda Sensor Removal

Euro 4 Lambda Exhaust Remove the rear panels and the crash bar. Spray both lambda sensors with PlusGas before attempting to remove with a 22mm spanner. The upstream sensor in in the upper elbow. The 2nd is in the silencer. This uses the same 22mm spanner. Disconnect...

451 Lambda Sensors

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.

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