Hello, I am the owner of a Mercedes E300 2017. I encounter a problem at times when I press the gas pedal and start accelerating from a low speed. The engine light appears and the car starts to twitch. The problem ends when I turn off the car and restart it.The error codes show that there is a misfire problem in the bank2 oxygen sensor number 1. I changed the spark plug and coils.

Need your support please please .

 

What was the condition of the old spark plugs and coils, what is the mileage on your car?

 

The old ones were fine, but I changed them all.

70k mileage but this issue start from 55k miles

 

Is the code stored or active, any other codes from other control modules, any new codes from the same module?

 

sometime P0304 and sometime P0303 when stop engine and start again engine light clear , engine Hesitation or sputtering in acceleration between 2000 RPM to 4000 RPM

 

Hmmm, first time hearing about this on this engine.
@chassis Mind helping out here? Thanks.

 

Is this the m274 engine? You may be misfiring for more issues than the plugs and coils. Injector ... compression issues ... cracked head etc

https://mbworld.org/forums/e-class-w...k-miles-2.html

 

Reason I asked for OP was because I don't recall cracked cylinders having those codes, maybe I just haven't came across it hence why I requested assistance from forum member chassis which he has a lot of knowledge on this subject.

 

If your plugs and coils are fresh and installed properly I'm guessing LSPI. Hows your oil

 

Keep changing it constantly changing it every 5000 miles ( shell helix ultra 5W40 )

 

Note: I encountered a problem of leakage and loosening of the outlet nut from discharge of high pressure fuel pump , I don't know if the two problems are related or not

 

Hi, I have 2017 E300 and has same problem. changed spark plug, coils, cleaned fuel injector but still misfired when accelerating. Could you advise me what the problem is and how to fix? Thank you.