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So I bought a 2010 E350 just over a couple of weeks ago and it's been sat on my drive until today (so first drive today) while i've had to sort out driving license stuff
As soon as I started off this morning I got warning lights saying that the ABS and traction control and run flat indicator were not working. Also says the attention assist system is inoperative.
The car still drives which is something I guess!
I have a carsoft v2 scanner tool on the way but just wondered if anyone might have any thoughts on why this has happened. It seemed fine before being left for 2 weeks and I have started it and let it run for about 10 minutes every 5 days or so.
Feeling a bit sad that this is my first experience of benz driving!
I'm thinking that it may be something as simple as a wheel speed sensor. ABS and ESP need the signal.
Not certain about the run flat system, but it too may be comparing wheel rotational speeds
The warnings will go away, but the computer will store the fault codes, you can get rid of those with a decent scanner, but they will not effect operation.
I've run into these error messages on my previous W211 when it sat for extended periods of time, usually for more than a week or so. It didn't happen every time, so I'm sort of wondering if weather conditions play a part in it, if you have moisture (or possibly ice this time of year) in a wheel speed sensor, which dries out after being driven for a while?
The ABS, ESP, and TPMS (run flat indicator) all rely on wheel speed data, so a malfunctioning sensor will disable all three systems. Depending on how the vehicle is optioned the run flat indicator uses the wheel speed sensors as opposed to sensors inside the wheels to determine if a tire is losing air, the low tire will rotate at a different speed than the rest and will eventually trigger the run-flat indicator.
The attention assist system most likely monitors the ABS and ESP systems, so it would also be inop if those systems aren't working.
I might suggest not guessing, charge the battery and see if they go away, then if you plan to keep the car and diagnose and repair get a scanner that can point you to the faults.I have an ICarrsoft MB2, it can read and clear codes and is Benz specific, Autel also makes excellent one's, some can do more diagnostic testing than others.
I might suggest not guessing, charge the battery and see if they go away, then if you plan to keep the car and diagnose and repair get a scanner that can point you to the faults.I have an ICarrsoft MB2, it can read and clear codes and is Benz specific, Autel also makes excellent one's, some can do more diagnostic testing than others.
I have the same scanner arriving today although I am new to all this so it's going to be a learning curve - is it worth trying to reset the codes first or will the scanner make it obvious what is at fault?
I will also get the battery on charge - can these codes remove themselves or do they need a tool to clear them?
My first W212 had an engine malfunction light come on but it cleared itself after a while. However, I had taken it to an indie Mercedes Benz technician and his DAS captured the code as well. Well, you may need a tool to clear codes and it systems detect any malfunction those codes will come back no matter what
I have the same scanner arriving today although I am new to all this so it's going to be a learning curve - is it worth trying to reset the codes first or will the scanner make it obvious what is at fault?
I will also get the battery on charge - can these codes remove themselves or do they need a tool to clear them?
You got this! Charge the battery with the negative disconnected, this will get you a system reset and a charged battery, the charging system in this car is very complicated, usually it charges the battery to around 80%, then only charges when you are coasting or braking, you can peruse SPrihadi's posts on alternators and charging, it's an encyclopedia! He did an excellent job as usual. The charging algorithms are rocket science level.
So after the battery is charged fully, you can drive the car and in the next 20-100 miles the warnings on the dash should go away those systems come back online, or you can hook up your scanner, read the codes, write them all down, then clear them, then they will only come back if the fault remains. You may have one malfunctioning part, it could be bad or you could have a bad connection to it at the plug or they could all be fine and the low battery caused the car to turn those systems off, all is possible but we start with the simplest things first, narrow it down to the particular fault and go from there, with so many fault codes it's likely the battery or a part that interacts with all those systems, everything is connected! Let us know how it goes, lots of smart people here on the forum who are glad to help out!
Last edited by pierrejoliat; Nov 16, 2022 at 08:22 AM.
You got this! Charge the battery with the negative disconnected, this will get you a system reset and a charged battery, the charging system in this car is very complicated, usually it charges the battery to around 80%, then only charges when you are coasting or braking, you can peruse SPrihadi's posts on alternators and charging, it's an encyclopedia! He did an excellent job as usual. The charging algorithms are rocket science level.
So after the battery is charged fully, you can drive the car and in the next 20-100 miles the warnings on the dash should go away those systems come back online, or you can hook up your scanner, read the codes, write them all down, then clear them, then they will only come back if the fault remains. You may have one malfunctioning part, it could be bad or you could have a bad connection to it at the plug or they could all be fine and the low battery caused the car to turn those systems off, all is possible but we start with the simplest things first, narrow it down to the particular fault and go from there, with so many fault codes it's likely the battery or a part that interacts with all those systems, everything is connected! Let us know how it goes, lots of smart people here on the forum who are glad to help out!
Well something amazing has happened - I took the car out tonight and after a couple of miles it just fixed itself! the warnings disappeared and all systems working! I am so happy
Many thanks for all the people who offered their advice - was good to feel there were people helping!
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