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Forum: 451 fortwo - Technical Queries

Got a technical query? View this Forum first to check on Technical Queries past and present. ALSO see our DIY smartsheets available via our home page.

  1. Should aircon be ON all the time?

    Reading "Honest John" website they say that if you have a manual aircon system you should have it "ON" permanently. They say that if it's not used for any length of time you'll get problems. My 451 Fortwo Cabrio (84) has aircon and I wouldn't normally leave it on all the time, (certainly not with...

    Started by anotherbob, 31st December 2020 10:28
    aircon
    • Replies: 4
    • Views: 428
    1st January 2021 22:51 Go to last post
  2. 2008 451 petrol V-belt replacement

    Havenít actually had anything to ask about my 2008 fortwo 451 for a while as itís been utterly reliable! (1 litre petrol, 70bhp, non-turbo Mitsubishi 3-cylinder) - but Iíve still got it. Itís done 51,000 miles now, and is 12 years old. The belts that drive the air conditioning and the...

    Started by nomen usoris, 21st January 2020 18:54
    2 Pages
    1 2
    • Replies: 13
    • Views: 3,416
    14th December 2020 18:47 Go to last post
  3. 451 0.8 cdi 54 hp misery 😔

    Hi, I have big problems with my smart, last week I bought from Germany, and car come to my address and I noticed that car make a lot black smoke all the time you reving it or you driving it. More smoke is made in lower rpm and whna you going up is little bit less but car can't pass emissions test...

    Started by vxbodul, 16th July 2020 14:50
    0.8 cdi cdi 54hp 451
    • Replies: 8
    • Views: 1,117
    22nd July 2020 11:23 Go to last post
  4. Question 451 Brabus - sudden loss of power at 4k revs

    Hi all, Long time member and back in a Smart again for the first time in a while. I bought a 451 a few days ago that's got some strange issues, so looking for advice. It pulls strongly in all gears when the turbo spools up, but as you continue up the rev range it flattens off after the initial...

    Started by davidclayton, 4th April 2020 23:11
    actuator, boost, p0235
    • Replies: 1
    • Views: 4,392
    23rd April 2020 19:32 Go to last post
  5. Boot opening.

    My battery went flat so charged it up and the autolock had enabled itself so I disabled it. No problems. However, it now seems that to open the boot I have to turn the engine off. I am sure it never used to be like that. Anyone know how to make it so I can open the boot with the engine...

    Started by Mjolinor, 24th December 2019 16:29
    2 Pages
    1 2
    • Replies: 14
    • Views: 3,372
    18th March 2020 20:49 Go to last post
  6. 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 13:08
    4 Pages
    1 2 3 ... 4
    • Replies: 32
    • Views: 9,139
    20th February 2020 21:08 Go to last post
  7. Smart 451 - Typical mileage expected before clutch replacement

    Hi I have a Brabus 451 with 65000 miles original clutch. Interesting in finding out how many miles other peopleís clutches have lasted for 451 only. Thanks

    Started by SUBARB, 6th August 2019 19:39
    • Replies: 2
    • Views: 2,343
    28th January 2020 13:48 Go to last post
  8. 451 2009 CDI temperature gauge.

    Any suggestions why ti's doing this: https://www.youtube.com/watch?v=T5gmMKkn0fU I changed the temperature sensor, checked the coolant level, disconnected the battery for a while and its just the same. No fault codes stored though I have not had Star on it yet.

    Started by Mjolinor, 11th January 2020 14:36
    2 Pages
    1 2
    • Replies: 10
    • Views: 2,535
    14th January 2020 12:48 Go to last post
  9. CDI fuel problem

    Are there any documented cases of the high pressure pump seal leaking diesel into the oil. Since I got the car I have had increasing oil levels, this doesn't really bother me as I just change the oil regularly. I put it down to me doing pitifully low mileage. A few months ago on an airport...

    Started by Mjolinor, 10th September 2019 09:32
    3 Pages
    1 2 3
    • Replies: 24
    • Views: 8,063
    11th November 2019 01:33 Go to last post
  10. 451 rear crash bar Torx screws

    Hi Wondered if anyone happened to know the part code for the rear crash bar Torx screws. I did contact mercedes dealership but for some reason the Torx screws are not listed on their part code drawings. Thanks

    Started by SUBARB, 28th October 2019 12:24
    • Replies: 4
    • Views: 2,333
    29th October 2019 18:47 Go to last post
  11. 451 Brabus exhaust manifold material grade

    Hi Does anyone know the material grade for the 451 exhaust manifold. This is from the engine to turbo inlet. Garage wanted to know prior to attempting welding of crack. Garage said they can only mild steel

    Started by SUBARB, 25th October 2019 11:56
    • Replies: 7
    • Views: 2,467
    29th October 2019 17:08 Go to last post
  12. Smart 451 wheel bearings

    When driving my 451 there is a drone when driving so I wondered if it could be wheel bearings I have jacked up the rear and spun both wheels they do make a reasonable amount of noise when spinning the noise is not break related and is bearing noise but in fairness how do I know if they have failed...

    Started by Campsea, 8th September 2019 10:14
    • Replies: 6
    • Views: 2,601
    9th September 2019 07:50 Go to last post
  13. 451 Smart Brakes Binding????

    I have a 63 plate 451 brabus, when I pull away from stationary I can hear the brakes 'dragging' if that makes sense??! Where do I start in sorting out this issue? Ive only just brought the smart and the front pads and discs are new as the original owner had full merc history therefore I guessing...

    Started by Campsea, 10th August 2019 12:02
    • Replies: 5
    • Views: 2,633
    11th August 2019 12:07 Go to last post
  14. Glovebox Blanking Plate

    Im looking at replacing my Highline stereo with a double din apple car play stereo is there a Smart blanking plate for the glovebox USB and stereo ports as I wish to sell my highland stereo and ports? Thanks.

    Started by Campsea, 10th August 2019 12:30
    • Replies: 1
    • Views: 2,092
    10th August 2019 13:12 Go to last post
  15. 2008 smart 451 - panel replacement - bodyshop in NW?

    I want to replace the rear bumper centre section and offside rear panel on my 2008 smart 451 because they are scuffed. I already ordered the parts and read the procedure on Evilution but it looks too complicated for me to attempt on my own without damaging something. Can anyone recommend a...

    Started by ash73, 25th July 2019 14:54
    2 Pages
    1 2
    • Replies: 10
    • Views: 3,585
    31st July 2019 17:04 Go to last post
  16. what battery fits 2008 451 turbo

    Hi, can someone point me to a cheap-ish replacement battery that fits a 2008 451 ForTwo 1.0 petrol turbo? I gather it needs a gas vent but none of them specify this. What is the OEM battery? Is it a Banner? The Banner web site doesn't list the 451 but this might be an error.

    Started by ash73, 25th July 2019 00:24
    • Replies: 0
    • Views: 1,892
    25th July 2019 00:24 Go to last post
  17. 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 20:37
    • Replies: 1
    • Views: 2,328
    30th April 2019 21:09 Go to last post
  18. 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, 16th January 2019 00:22
    2 Pages
    1 2
    • Replies: 19
    • Views: 5,718
    23rd April 2019 08:02 Go to last post
  19. 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 09:59
    • Replies: 4
    • Views: 2,957
    5th April 2019 11:20 Go to last post
  20. 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 14:31
    • Replies: 7
    • Views: 3,430
    23rd March 2019 13:47 Go to last post

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