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Discussion Starter #1
My 'check engine' light has come on. Mercedes Canada and the dealer say 'ignore it and just have it looked at at the next service'. No other error messages, just the check engine light. Engine runs fine.<br>
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Still, this does not make me happy, unless I know what it could mean. Does anyone know?<br>
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MW<br>
 

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Re: Check Engine

I'm not sure about the Siemens software, but in Bosch Motronic there are two types of faults: minor ones that are not displayed on the dash and major ones that do trigger the check engine light.<br> <br> I would assume that the error was significant, otherwise why would the software bother to bring it to the driver's attention?<br> <br> Perhaps the owner's manual has some information on the M-B check engine protocol. For example, it is possible that all faults trigger the light but only a serious one will make the light remain on at all times....? I am just guessing here.<br> <br> I am surprised by the 'What, me worry' attitude of MB Canada and your dealer. If my new car was flashing error messages to me I'd want to know the cause too. It is even conceivable that ignoring the warning could compound the problem in some way.<br> <br> However, if the car's performance seemed not to change at all when the problem was relayed to you by the light, perhaps it's not too important.<br> <br> It seems to me that, at a minimum, Mercedes-Benz should explain WHY it is safe to wait until the next service. They at least owe you that much.
 

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Customer ignorant

Yes, quite... <br> <br> All big business, MB included, wants to see the customer as a user who is not 'entitled' to technical info. I am pretty sure, for instance, that I could read fault registers using the A/C unit (just like I can see engine parameters), but this too is 'secret'. <br> <br> I have no idea why, having paid all this money, I can not know how the darn thing works!<br> <br> Michael<br>
 

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Re: Customer ignorant

Well, I can understand it - at least partially. I work in the computer industry and it's a nightmare, how many 'self made specialists' f*ck up a system trying to improve it. When they finally call a specialist, they insist in not having touched anything, and that it stopped working from one moment to the other without any intervention from their side.<br> <br> This is very annoing in a computer - but could be disastrous on the street.<br> <br> This is, however, only true for modifications of the system. Something completely different is INFORMATION. They try to hide the 'difficult stuff' behind a nice interface. That's OK, but they should at least explain this interface. And if, like in this case, a warning light goes on, they should either be able to clear the fault and make it go off, or explain in detail, why in this case, the warning light can be ignored.<br> <br> Another option could be to make their system tamper proof enough so they could hand out all information while ensuring, that nobody who is not trained (or entitled) would be able to modify the configuration. This is, however, not easy, as we are talking about software and this is hackable (the best proof are the chip tuners out there).<br> <br> So I think the only real solution is a 'good service' from MB that includes 'information' whenever something is not self explanatory or in the handbook.
 

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Re: unacceptable

Michael, I believe they need to explain what the light means on new car, especially if its still running fine, and better yet, take care of it. <br> <br> I paid to get the break in oil changed, and the service interval skipped service A and started showing that the next service is B. The dealer said its OK since there is nothing much done in service A. I demanded that service A be restored and they spent half an hour on the car to reverse the service mode.<br> <br> Then, I was getting wind noise from driver side door. Took it to the dealer and he said that he took the seal out and re-installed it and its fine now. But it wasn't. Took it back and the other mechanic concluded that the seal is bad and they order and installed a new one. The noise is gone.<br> <br> You would expect mercedes dealers to be more responsive, but at times they are not, so you may have to be more persistent until you are satisfied.<br> <br> As a side note, any idea how to get diagnostic info. on C240, since it does not have the digit read-out climate conrol.
 

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Skipping Service A???

Ack! Changing the oil early clears the Service A timer? That's no good. Do you know if it got cleared because they *told* the car they were changing the oil, or is there some sensor that lets the computer see when you pull the oil filter off? I'm planning on changing my oil well before 10,000 miles when I get my C32, so I'd like to know what I'm going to be up against.<br> <br> BTW, does anyone else find it a little scary that the service intervals are so long on these cars? It's almost as if they really stretched them out as soon as they started including the service in the price of the car.
 

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Hmm

Hmm.. I work in the computer industry as well (CTO), but would not presume to tell my paying customers they are not allowed to know something. A disclaimer is fine - if I open up the engine and mess things up it';s my risk. But no way should they prohibit me from knowing stuff. It's MY car!<br> <br> Michael<br>
 

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Re:

Checn Engine usually indicates some 'fault'<br> in emission control systems - like oxygen<br> sensor, cats, evap emission control system<br> and others. Often caused by not tightened<br> filler cap. Usually to be ignored till next<br> service - but it bothers me so much that<br> i would not drive a single mile with some<br> annoying warning lit.
 

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Discussion Starter #10
Don't worry about it.

The car has no way of 'knowing' that you changed the oil early. The only way the timer gets reset is if you actually reset it.<br> <br> If you just change the oil and filter, it will not skip Service A automatically. With the guy above, the dealer must have reset the FSS after changing the oil.
 

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Re: Hmm

That's exactly my point: The customer should definitely be entitled to receive all the information about the product he purchased.<br> <br> What is acceptable, is that they try to close their system so the customer can't modify it.<br> <br> What is wrong is their method: Hiding the information instead of securing the system.
 

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Discussion Starter #12
Re: skipping service A & synthetic oil

As far as skipping service A is concerned, not sure how it happened, but the way the mechanic and the service manager were surprised, I got an impression that they had no clue that it had occured. Had they reset themselves, I would imagine that they would know about it. I went through the FSS brochure and it says that there is a sensor that monitors the oil (temp, viscosity yada yada). If that is true, then it may have skipped the A service by itself. <br> <br> Now for the synthetic oil. I got a letter from MB that they are switching to synthetic oil and it said that with the next scheduled service, my car will be switched to synthetic. <br> <br> The idea of driving break in oil for 10K miles was difficult for me to grasp, so I said, what the heck, lets switch to synthetic now and get the break in oil changed as well. Now when I will take my car back for service A, they will do a synthetic oil change as part of that service.<br> <br> Or could it be the switch to synthetic that got the sensor to mess up and cause the Service A to skip?? :) The engineers in Germany can't always be perfect ....
 

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Re: Check engine

The manual says the light has to do with the catalytic converter, so I presume you may emit more greenhouse gas but should not affect your car performance.<br> <br> In any case, I do agree the delare owe you an explanation.
 

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Discussion Starter #14
It does not reset itslf, your dealer obviously reset it and won't admit it!!

That's a bad sign of your future service from this dealer. The tech had to have reset it, switching to synthetic oil would have absolutely nothing to do with this. Big question, when did your FSS say your B service was needed? If it was 10k or so then they reset it, if it says 10k or so minus your current milage then maybe you do have some sort of computer malfunction. Even when you have service A done it won't reset itself, they reset it, that's why you've got to tell them not to when you're doing a service between FSS services, the free ones.<br> <br> I had been told that when I changed to Mobil 1 at 3500 miles in our new C that the distance to service A might go up a bit because the sensors detected new oil, but when I got it back it still said 6400 miles to service A.
 
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