altinmy

Last month I bought Mercedes-Benz E200 of 2013 with automatic transmission 7G and gearbox code 722.996.

The car seems to be running just fine sometimes but sometimes I notice some problems in changing gears.

When the eco mode is on this problem is triggered most often (but not only when the eco is on) because the car goes on and off too often.

When this problem is active the car will change the gears in high revs (about 2500-3000) even if the road is downhill. Also, the car will never reach to high gear, it will go up to 5th gear and no matter how much I speed up it doesn’t allow me and it won’t gear up. Car won’t accelerate even if I hit gas pedal at the end.

In this state I can’t switch car to manual either. The buttons won’t respond.

I checked car at a MB specialist here in Albania and they detected a problem in DPF sensor and I changed it. This helped the car to remove the check engine but the problem mentioned above keeps going on. I face this 2-3 times daily and the only thing I can do is turn off and on the car so it goes normally.

So this problem doesn’t happen always but most probably to happen every day if eco mode is off or if I turn off and on too many times a day. When this happens I get these problems on car:
- Changes gears at high revs (2500-300) and won’t go more then 5th gear
- Won’t accelerate fast
- Can’t switch to manual (options on steering wheel do not respond)

Once I turn off and on the car doesn’t have any of the above problems.
Odometer has 165 000 km and I changed ATF when I bought the car.

Now, the MB specialist that I went through is not giving me any clue. He says even if I disassemble car I can’t tell anything since scanning doesn’t show anything.

Can anyone help me?

S-Prihadi

When you place your car model on the title of description, always make sure you tell others the engine fuel type and engine model number.
Diesel is not common in this forum or any gasoline engines smaller than 3.5 liter if for E class.
Only when you mentioned DPF I then realized your engine is diesel
Is there a 2 liter gasoline engine for W212 ?, yes, M271 . But in USA I doubt it is ever sold by MB USA.

Your problem seems to be more of a transmission caused and not engine per se.
I do not know anything about MB diesel which I believe yours would be OM651 if a 2 liter.

The transmission is allowed to do things when and if the engine computer allows it to do.
Tranny gives information to engine computer on its status bla bla bla, engine computer decides what tranny can do when you kicked down that throttle.

So engine and tranny are very related electronic/data wise, unlike in older model more mechanical cars.

When you got the limp mode, what DTC did you get and what scanner are you using to read the DTC ?

altinmy

Hello,
Thank you for your reply and sorry that I didn't mention all car details, but I am not very good with cars.
So yes, the car is E200 Diesel with Engine capacity 2143 ccm and engine code 651.925. Displacement 2.2 Liter (M22) (I am not sure if all these information are needed).
Let me attach the results I got from scanner before car engine check was on.
I am not sure what scanner type the mechanic was using but It reads "autologic" on the device reader.
I am attaching the faults before limp mode.

S-Prihadi

Autologic is a good capable scanner for Mercedes , popular in Europe, so I read. Expensive too .

Check with your mechanics, how many fuel filters are there in this car ?
Could be 1 at the fuel tank and another one in engine bay. Replaced both filters if indeed the car uses 2.

If your car done 165,000 KM, if the diesel fuel filter has never been replaced, it would be partially clogged by now.
If in my country, 40,000KM is about as far as we can go on any diesel engine fuel filter and based on Euro 4 grade fuel from Shell.
If using my local government oil company diesel fuel but also Euro 4 one, its not as clean as Shell a bit shorter lived.
If using my local government oil company subsidized diesel fuel , at every 5,000KM along with oil change I replaced the diesel fuel filter on my long time ago
Toyota already using a Gen1 common rail diesel engine. So cheap the Toyota diesel fuel filter.

Yes, my country is stll using Euro 4 as highest fuel standard and this happen only in 2020...LOL.
Before 2020 our diesel fuel was a Euro 2 spec....DUGGGHHH !!!!!!

altinmy

I did changed both filters since they didn't cost much and I wasn't sure when the previous owner did change them. Still no luck, same problem going on.
The car is Euro 5 but still here in Albania they play alooot with fuel quality, we don't know what we're buying and everyone keeps facing problems with their cars.
To me it sounds like a sensor or electrical fault because when the car starts, and the problem is not active it will not show until the car is off and back on. So I may drive 2-3 or more hours without turning the engine off and the problem will not appear. If the problem appears, it will show since start.

Also, if it is some air leak this problem should appear anytime right? Or at least this problem should appear even after driving a few km (even though the engine is not turned off)?
Here in my country they are not even allowing Euro 4 anymore to be imported but they allow the one that are in to run.
In your country you should have problems with fuel quality for sure since you're still on Euro 4, thats bad for your car also

P.s. Someone suggested me to check battery health, to me it seems that it is not a problem that may be caused by battery but let me know what you think.

S-Prihadi

Intermittent problem is not easy to find and take a lot of work.
I am not familiar with modern common rail diesel engine electronic management system.
What you need is a good diagnostician, not a mechanic only.

The guy must have a scope to see those signals suspected as problem.
If problem is also inside transmission computer or conductor plate..... this one you must find transmission specialist.