ABS and ASR Light - Disabled System - Mercedes Benz SLK Forum

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#1 Old 05-14-2012
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ABS and ASR Light - Disabled System

Hi All
New to SLKs having just bought myself a low mileage 230 week and a half ago. It came with service history and had no problems on the way home, 550 miles, and the following week I decided to service it myself which was no problem. Being keen to ensure I covered all the bases, I bit the bullet and out it into MB stealershipp to have the transmission fluid and filter replaced. When I went to collect it I was told that when they took it for a test drive following the fluid change, the ABS warning ight had suddenly come on. They checked the fuses etc, and the light wouldn't cancel. Then it had the computer stuck on for a diagnostic and it read the ABS unit was broken. This has resulted in the ABS and ASR system now being disabled and the lights on. I was quoted £1500 for a replacement from MB. My query is
1) Does this ring a bell with anyone who has a cheaper and easier fix?
2) Although I accept these things can happen at any time, it just seems a coincidence that when they're poking about at it, it suddenly decides to throw in the towel, could it have been something they did when working on the transmission?

Just interested to hear any thoughts
Thanks from a newbie
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#2 Old 05-14-2012
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#3 Old 05-14-2012
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Nicky - did they say what caused the problem? There's a gear on the axle shaft that's used to detect spin - if it's broken, then MB wants to replace the whole thing. There's a aftermarket company that make just the gear, called a Reluctor Ring, that you can have a mechanic fit - IF that's the problem...


If that's not the problem, then I think a second opinion is in the works - seems coincidental at best that it happened when they were mucking about with the car....



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#4 Old 05-14-2012
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Being silly and going back to basics , it wouldn't be that the steering needs resetting ?? Steering , full to left then full to right ???
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#5 Old 05-14-2012
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Why would they take the car on a test drive? Changing the ATF is a routine job...
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#6 Old 05-14-2012
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Thanks for the quick responses guys. The reason the car was taken for a drive, I'm assured was to allow for a level test after it had a short run. As for the other tips, this is all new to me so I'll have to look inot these suggestions. I'm also glad someone else seems to think it's a hell of a consequence that this happens when they're poking around at it! Hmm! will have to think about my next move. Thanks again
Nick
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#7 Old 05-14-2012
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Honestly, this is the first time I hear about such a level test. Anyway, good luck and keep us informed!
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#8 Old 05-14-2012
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Quote:
Originally Posted by nickygee11 View Post
...the computer stuck on for a diagnostic...
Diagnosis of MBs seems to need considerable skill, training, and experience of their special diagnostic kit. Having had various odd and perplexing symptoms with my 2002 SLK over the years, I have reached the view that working on these cars really is beyond the ken and competence of non-MB specialist technicians. They need the use of the official MB Star diagnostic kit by experienced & fully trained dealer techs. It may seem like an expensive way to proceed, but it gets the right answer quickly, and ends up costing less, in my experience. If the Aberdeen dealership techs are of similar quality to the Coldstream ones, you'll be okay with them
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#9 Old 05-15-2012
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Second opinon. I don't trust MB dealerships in the slightest. My wife had a A140 many years ago. One day the car would not idle properly. Took it to dealership who diagnosed that it needed a new computer - £600. Stupidly, I had it done, only to later find on MBWORLD that removing the air intake and using WD40 was just as effective. Some time later the rear suspension started to go funny. Took it to the dealership who said it needed a new swing arm and if one had gone the other was not far behind. Total cost for both sides £1200. Took it for a second opinion who said the swing arm is fine but the bearing is basically a steel slieve which had rusted away causing play. Replacement slieves both sides done for £200. Sold the car shortly after that.

These are not difficult cars to work on. In fact they are quite easy in many respects. However, it is the dealerships pledge to extract as much money from of it's loyal (and sometimes gullible) customers as possible.
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#10 Old 05-15-2012
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Thumbs up MB dealership standards

I well understand your cynicism in view of your experience, but fortunately there do still exist good honestly run dealerships with skilled and committed techs. The one I referred to has a compact service section- 3 or 4 techs- and small tends to be beautiful- there is no hiding place for the substandard.
I agree of course that our SLKs being very well engineered are as straightforward to work on as any- it's on the electronic side they are well & truly complicated, with several separate system ECUs/control modules inter connected and communicating with each other through canbus & SAMs.
The trick dare I say is finding a good dealership in whose staff you can have confidence- not always easy
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#11 Old 05-16-2012
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Thanks again for the replies. FYI, it was MB in Aberdeen I had it at. This morning was the first denet bit of sun so I decided to drop the roof and go for a blast......yes, thats right, the roof doesn't wotk withput the ABS unit, whihc sent me totally over the edge. Upon further investigation on internet, I revealed all kind of anecdotal oddities, including Dirty ABS sensors, brake light switches, battery issues, etc. all of whihc apperar to have been responsible for similar cluster of issues. I called to discuss this with MB and was told the exact diagnostic was some kind of actuating solenoid 'inside' the ABS unit. I did take off the ABS sensors to clean them as a matter of course and proceeded to snap one (yes, you can almost hear the reaction, not to mention another £40 down) Nonetheless, I have ordered a second hand ABS unit from a breakers, correct part number, model, etc, and am now optimisitc that when I get home in a couple of weeks I will get this fitted and all will be well in the world (That's what I'm telling myself anyway). So thanks for the input, always good to know there's some experiential learning available to be tapped into. I'll let you know what happens in the fullness of time, if nothing else then as a learning to any others who might be forced to follow thie same path.
In distant anticipation.....
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#12 Old 06-14-2012
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Update - Finally got the recently purchased replacement abs pump fitted by my local, and very capable and trustworthy, garage. Zeroed off the old error codes and took it out for drive. ABS/ASR lights came back on. ABS pump I bought from breakers is now reading fault with high pressure return. Ordered another that I am assured was checked before being removed so now have to wait for another slot at garage to have fitted and zero off existing error codes
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#13 Old 06-22-2012
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All good now

Latest ABS pump arrived and fitted, .......wait for it........yippee

All good,despite the breakers sending me one with the wrong number, it still works and good to be back in A1. Still been enjoying it but now, if the sun ever comes out and the rain ever stops, I'll get the roof down and 'pose' for a bit. Love these cars!!!
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