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Forum: 451 fortwo - Technical Queries

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  1. 451 Brakes

    I sold my 451 to my niece and she says the brakes are shot so I got her a quote of 151.19 inc GST for a new set of front brake discs and pads. I presume its most likely to be the front brakes at fault but is there any rear brake discs?

    Started by nlel, 29th April 2019 12:08
    2 Pages
    1 2
    • Replies: 10
    • Views: 933
    17th May 2019 11:50 Go to last post
  2. Keyless entry remote acting up.

    One minute it works normally then the next time I use it it doesn't. When I press LOCK, UNLOCK or the HATCH button, the lights flash 3 times but the doors don't unlock. If a door is open and I press any button, both door locks go on and off twice. The most annoying thing is when I can't get the...

    Started by atikovi, 30th April 2019 19:37
    • Replies: 1
    • Views: 252
    30th April 2019 20:09 Go to last post
  3. Traction control light comes on and stays on until restart during motorway driving

    Seeing a strange problem with my (aged) 451 lately that I've not seen before during her 126,000 miles done so far. While driving from Manchester to London last month during driving rain on the motorway the traction control light comes on and remains lit some 100 miles or so into the journey, I...

    Started by andrewh1973, 15th January 2019 23:22
    2 Pages
    1 2
    • Replies: 19
    • Views: 972
    23rd April 2019 07:02 Go to last post
  4. Stereo fuse keeps blowing

    Hi all, my stereo keeps blowing thebl10a fuse at the back of the unit by the dins. Any ideas and does the wiring look right (pic to follow as can't upload now) as the leads going into the din were loose when I took it out. Its not worked since I've had the car. Thanks 👍

    Started by Smart PB, 19th March 2019 08:59
    • Replies: 4
    • Views: 464
    5th April 2019 10:20 Go to last post
  5. Permanently disable ECO/MHD or repair!

    Hi all For the last few days I have been driving only with ECO off and touch wood the car has driven fine with it off. For those that haven't seen my previous posts the car was going into neutral when driving, then not selecting gear, jumping & slack gear changes. So it seems MHD is the...

    Started by Smart PB, 14th March 2019 13:31
    • Replies: 7
    • Views: 515
    23rd March 2019 12:47 Go to last post
  6. Downstream lambda and bonnet queries

    Hello everyone and a happy Friday to you all! Couple of things: Need to change my downstream O2 sensor, anyone know do I need to take the rear bumper off to do this please? Also it seems, well no it doesn't seem at all, my bonnet doesn't have any locks in it. So you can lift out when them...

    Started by Smart PB, 1st March 2019 11:32
    • Replies: 0
    • Views: 439
    1st March 2019 11:32 Go to last post
  7. 451 audio system cd stuck

    Hi folks. Have the Highline audio system in my 451 MHD. I loaded a cd tonight and it is stuck inside the player. I have pressed eject, turned the player off and on, turned the car off and on but still can't get the cd out. The front panel will not close and there is a continuous faint clicking...

    Started by Hadleigh Marky, 27th February 2019 17:50
    • Replies: 2
    • Views: 466
    27th February 2019 19:40 Go to last post
  8. Got me a Smart, it isn't well!

    Hi all So after liking the look for ages I finally took the plunge and bought one the other day. A lovely little 2009 Passion MHD 1L in grey/silver. Now that was the good bit, the bad bit is it isn't at all well! The following is a long story, long story short I think am looking for...

    Started by Smart PB, 2nd February 2019 18:26
    5 Pages
    1 2 3 ... 5
    actuator, clutch, transmission update
    • Replies: 46
    • Views: 1,977
    27th February 2019 15:01 Go to last post
  9. Rate my actuator!

    Hi everyone As you know I have been having some transmission issues so thought I would do a quick video of my actuator in action! Can anyone see or hear anything that suggests it needs adjusting, replacing or cleaned/lubed? Thanks Paul

    Started by Smart PB, 12th February 2019 09:52
    2 Pages
    1 2
    • Replies: 13
    • Views: 859
    17th February 2019 15:41 Go to last post
  10. Pioneer AVIC-F930BT Sat Nav

    Does anyone know if this system is compatible with my 2012 451 Fortwo Cabrio? https://www.caraudiocentre.co.uk/product_m-pioneer-avic-f930bt_p-27101.htm#reviews I'm seriously fed up with the OEM satnav and I don't like having to use my phone as a Satnav. Edit..... Just seen this unit...

    Started by anotherbob, 3rd February 2019 11:26
    • Replies: 8
    • Views: 623
    4th February 2019 11:06 Go to last post
  11. MHD belt issue and peeling - whats my best options

    Hi, I have an '09 MHD that had a belt fix of some sort done by MB under 'Good Will' nearly three years ago. It seemed OK for about 18 months but I didn't drive it that much, in the last 18 months I've driven it more and its failure got steadily worse with the recent belt only making 2 weeks !!!...

    Started by zak99, 30th January 2019 12:40
    • Replies: 2
    • Views: 568
    30th January 2019 17:59 Go to last post
  12. Seized rear brake ??

    My wife went to reverse her car this morning and it would not budge when she released the handbrake and engaged reverse. Instead the car sort of reared up and there was a burning smell appeared from somewhere. I jacked the car up to check the brakes and the first one I tried would not rotate...

    Started by mog, 21st January 2019 13:52
    2 Pages
    1 2
    • Replies: 12
    • Views: 932
    29th January 2019 11:53 Go to last post
  13. 451 fan/blower issues

    The fan on my 451 reacts badly to bumps in the road sometimes staying off until the end of the journey no matter if the ignition is recycled. I have taken the fan to pieces and cleaned the contacts, it now blows much better than before BUT is still affected by the road surface. If I jiggle...

    Started by b1ackb1rd, 20th January 2019 12:01
    • Replies: 3
    • Views: 561
    20th January 2019 17:36 Go to last post
  14. GB-10 sat nav

    Does anyone have the Pioneer f910-bt sat nav unit fitted to their 451 from the factory? I've retro-fitted this unit to my 2009 cdi, it came with leads and a 451 fascia so I know it's a dedicated Smart unit. My niggle is that the unit comes on with the ignition, that is often a real pain. ...

    Started by b1ackb1rd, 19th January 2019 09:30
    • Replies: 4
    • Views: 590
    19th January 2019 21:32 Go to last post
  15. Weird noise on start up

    Our Smart MHD has recently started to make a metallic clang noise on starting up from cold. It's literally just one clang and nothing, it runs and drives fine. I'm going to service it tomorrow and have a little look over it but I would be grateful for any input. its just ticked over 60K and...

    Started by jan_tekin, 4th January 2019 20:25
    • Replies: 5
    • Views: 727
    6th January 2019 21:11 Go to last post
  16. Flashing Yellow ECO Light

    My 2009 Model refuses to start now. Initial symptoms started about a week ago where it failed to start when coming to a stand with the MHD switched on. I had to switch engine off and on again. Also noticed that intermittently the ECO light would flash yellow a few times. Car is now refusing to...

    Started by mkrt1972, 3rd January 2019 14:57
    • Replies: 3
    • Views: 657
    4th January 2019 16:17 Go to last post
  17. fault warning light??

    451 smart 4-2 pulse I have a two spanner warning light come on with 'consult workshop' message, also gear change number flashing. servicing is up to date. anyone any ideas?

    Started by s2steamy, 5th December 2018 16:19
    consult workshop, flashing gear symbol., two spanners
    • Replies: 4
    • Views: 860
    7th December 2018 08:50 Go to last post
  18. 2010 451 84hp turbo gearbox oil change

    Morning folks. I managed to change the gearbox oil on a 451 84hp turbo a while ago, as task made much more difficult due to some sort of plastic (intercooler?) air scoop that sits right in the way of the fill plug. I couldn't see this piece on the guide I used, nor how to remove it. In one...

    Started by jonus, 5th September 2018 09:57
    • Replies: 3
    • Views: 1,337
    6th September 2018 23:20 Go to last post
  19. 451 cdi driveshaft

    My 2009 44hp cdi (50k) has end float on the drivers driveshaft - it moves 5mm at least. Passenger side has no float. Is this normal?

    Started by b1ackb1rd, 23rd July 2018 08:16
    2 Pages
    1 2
    • Replies: 11
    • Views: 1,751
    24th July 2018 21:25 Go to last post
  20. Hissing sound after driving

    Hi all, I went to test drive a smart for two 451 MHD 2010. After test driving, I noticed a hissing sound and water dripping from the bottom of the car. The hissing sounded like air being released from a tyre. My suspicion is that it is related to the air conditioning and is completely normal. But,...

    Started by gt86, 2nd July 2018 15:40
    • Replies: 3
    • Views: 1,118
    3rd July 2018 12:00 Go to last post

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