Smart Fortwo 451 not engaging gears. ABS and Airbag lights ON. Fault finding and repair. 

Sometimes when you replace a blown fuse and it doesn't blow again, see how it goes, not a lot more you can do. Several years ago I had a smart car stuck in neutral from a blown fuse, after changing the fuse it blew again on a road test, it ended up being a heated O2 sensor wire rubbing on the bumper as the engine swung a little while changing gears. Thanks Matt

Morning ! Yesterday i stumble upon your very informative channel . I watched straight for 9 hours your videos .Great Job . I have nothing to do with car repair/diagnostics at all , but so i have nothing to do with boards repair and thx to Louis Rossmann i managed to repair mine and few other macbooks .I have to say i see your channel being successful as Rossmann soon ! I love to learn and try do things by my own .So with that being said Thank you very much for all your informative content that makes ppl smarter ! I Have few questions for you and i hope when you find few minutes free to give me a hand with it . I own 2005 1.6 semiautomatic Peugeot 307 After few min of ride the "Gear Box fault" appears ,i can drive a few km more then i get electric circuit fault and then ABS , breaks and Power steering as well goes of . The Car stops and i am fucked ! No way to turn the ignition on -just a beep . What i do is wait for 10 min and i need second battery to help start the car with jumper wire . In the country where i live (im a foreigner) To find an honest mechanic is harder than finding magic mushrooms on the desert . I am planing to change the solenoids in the gearbox valve at first and change the transmission oil . It will be my first ever approach in automotive area repair . What should i look for next ? What software may be helpful do diagnose the issues ? (i have only laptop , multi meter and elm 327 Bluetooth OBD) .Please can you give me some tips ? Could the solenoids some how be related also to all the other issues ? I ll be very proud to join your patreons group as well . Than you M8 .

Had the excact same thing the other week on a breakdown I attended. Checked the amp's being pulled after I replaced the fuse and nothing excessive. The guy was desperate to drive home so he got himself some 10A fuses and off he went.

one car i found had a square type 30a fuse witch was blown and some one just opened fuse cap and bent two pieces of metal inside so the fuse would work but it would disconnect after a while when driving and car would not start, but later when car was cold it started just fine. So glad that i just inspected the fuses.

Thank for another great vid my trick to stop wasting fuse is adapt a blown fuse with a bulb on each pin . If there is a short bulb full brightness if circuit Good a small glow. Works best on wiggle test maybe good then bad

Usually this error is either the Brake light relay or the fuse that powers that circuit. The car will prevent it's self from going into gear if there's a problem with the brake system.

My car has this issue with the gears. Will be checking fuse 2morro! Thank you.

Surprisingly simple fix😉 It happens sometimes😉 Thanks for sharing Bro👍 Stay safe Bro❤

Hi I have problem with my gearbox on smart forfour is sami automatic when is cold is go on every gear after 100 miters is lost 2 gear and reverse any idea what it is thanks

Thank you for another great video Can you make episodes about hyprid and electrical cars and how can we fix them i like your videos so much and trust everything you say to us because you are the best in this field

I had this model with the same issue ,the dealer replace the shifting motor,then I investigate the motor and all the brushes inside where contaminated with carbon from the contacts of the rotor and oil from inside the gearbox. I clean all this gunk and resold the motor,the person who both it from mr didnt have any issues.

ilooked at one of these a while back for a misfire on number 3 cylinder. All the time the fault was active it would continualy loose drive and not come out of neutral. The drive indicator would go blank..After fixing the misfire and clearing the codes it drove perfectly. No more transmision issues. Must have been a failsafe condition to stop you driving with a fault

I have a 2004 w454 with a new gear sensor which I have been unsuccessful in putting it into the gearbox for me to do the teach in. WIS doesn't have documentation for that particular issue. Only photo of a tool for aligning the sensor. How do I replace the sensor

This video was so helpful thanks

I have a pb with the esp warning light Its keeps on How can i fix it.?

Hello haven read all the reply, you may have already said? What scanner are you using? Thanks

hi, I am buying 2006 smart for two and have an airbag light. do you think it's ok to buy this car? Is it with the light on or drive it? its drives ok.

What fuse saver do you have? I have searched forever for an IPA pulsar, but no luck. Maker promised a newer version but nothing so far. I need something with current limiter.

I had the same issues whereby the gear selector was stuck in neutral. My independent smart garage used the STAR diagnostics which came back as a broken brake light switch which also disengages the gear selector, unsure why this is but they replaced the switch and the car works fine now. If anyone can confirm the above sounds correct to stop me worrying in case it’s something else then I’d appreciated your feedback.

Thank you for another great video!!! Just watched part two of this video. The owner should've gone to automatic gearbox specialist first. I bet it would be general reapir :)

So easy so simple, unbelievable simple ;)

I had the same problem last week, the guy that repairs my car said it was the gearbox and that it had to be replaced… He said that a new one cost 3500 euro, but he will buy a sh one with 300 E, the car works now but i am very confused… Was that a lie? Or am I the one with bad luck? I had the same simptoms, the abs was one, i could only drove the car in 1 and 4 gear… 😑

you are amazing thank you so much I have subscribed

Hello @LM Auto Repairs, Hello friends, please i need help, I just bought a 2007 Smart 451 Diesel, When I start it there is the yellow engine light that stays on (1 time out of 5), On the other hand, when it stays on, the car apparently goes into Safe mode (Security) and therefore no function works, nor the change of gears, nor acceleration. I decided to change the actuator (the speed actuator) I bought a cheap one on Cdiscount without brand, Apparently it does not come from there, I changed the gearbox computer, it does not come from that either, I carried out a Mercedes diagnosis at a Smart Mercedes specialist in Marseille, the gearbox update etc. ... failed and the faults that come out are: P0805 “Clutch System Fault” (current in memory) P1700 "Resisting torque at gearbox input (current in memory) P1800 "Implausible gearbox data (current and stored event). Something else, The car sometimes starts cold and stops like it doesn't have enough power, so I cleaned the EGR valve, put it back in and it wouldn't start, I had to redo it started with a start pilot spray can, Then it worked normally, but yesterday it went out again when I started (cold engine), infact sometimes I have to accelerate a little so that it stays started (but only when cold on the first start) I should mention that I changed the glow plugs too. Anyway, my real problem is that famous yellow engine light that prevents me from driving when starting, I also specify that the Diagnostics guy, to find a method so that the light goes out when it is on just to drive, he plays with the gearbox by switching to R, N, D, 1 quickly several times in a row, and when he does this the light disappears, the engine speed changes (we feel like a slight acceleration), and then, once the yellow engine light is off, I can drive... Please help me, because I'm afraid to change the clutch unnecessarily, especially since the car is only 60,000 kilometers old. Thanks very much.

Top man 👍 ... Resetable fuses would come handy there 😉🙌👍👍

Hello mate, I’ve got a issue with eco mode, it does not go green never and sometimes it’s flashing orange and when it does it gives you shocks while driving when changing gears.Its a 2009 smart 999 litres petrol.

is this the same car you done Flashed and update the software ? i have the same car no warning lights but no gears no other lights. everytime i puy into gears the N lights starts flashing..

Most of the time fuses blow for a reason, it’s quite possible that there is an intermittent short somewhere.

Hi what program are you using. Can you give me a link to buy your tablet

Missing visual check on the cables. There was sun outside and dry. If it was raining, possible water leaks in modules.

Hey from Poland, i have the same situation and before to check fuses i have bought new VSS vehicle speed sensor from P0500 fault and still the same, so i need to run tomorrow for check fuses 🤣🤣🤣🤣🤣🙈Thank U for move help

Exactly had the same problem…. Changed a lightbulb and a fuse blown up ! OBD reader said it was the brake switch, ABS and other stuff and it was the stop fuse !!!! When blowing up, it also « freezes » the brake switch and you just can’t switch gears anymore…. How dreadful

Hi, Where are you based? Can I bring My smart for two to you as it needs some work.

Iv got just the job for you. Would make a good video.

My guess is that the other shop when taking out the Sam they blew it or the passenger dash airbag probably that yellow plug blew it

It should be the FIX 👍👍

Hi , can you please tell me where can I find the abs unit at the 451 ? Thanks

Gearbox is controlled separately by the Tcm under the seat of the driver on a European car. I fix these for years.

I like that test cable, Where did you get it from?

Se resolveu. Ficou resolvido. Não vale a pena complicar. 👍

Can I ask what obd2 program are you using?

Nice video

Very good!

Dreadful video. The first one of yours where I thought you only did half a job. The fuse should be 10A but was replaced for a 15A and even that blew. You then did minimal inspection and just replaced the fuse again. 15A is serious current and I'd want to find out where the true fault is.

cant show diagrams since you paid for acess? and glad ot was simple

Hi can you please reply to a abs problem I have. I would appreciate it!

Why didn't you show us the diagrams?

Is that the same car u fixed the gearbox in before those semi automatic gearboxes are crap . Why would you buy a smart car when you could get a yairs VW up or Nissan micra that has more room looks better and is built to last PS they all have nice interior

Great

very lucky binggo ..

car has more problems than abs issue, it sounds like a tractor, i would be more concerned with that

😁