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Hi, I have CLA 250, 2017 - all stock. Due to quarantine/lockdown in my area, I was not able to drive the vehicle for 30 days. So I was concerned about battery discharge, and after reading some forum, I decided to run the engine at idle for 30 minutes.

However, after about 20 minutes, the engine started shaking, and on the dash engine light came-up. Also, from the exhaust end, I had some foul/burnt smell. I thought maybe it's due to over-heat or unburnt fuel in the cylinder or something, so I took the car for a short spin in my gated community, but I felt very rough idling and acceleration. The engine light intermittently kept blinking, and after a few minutes of driving, it's now constant.

My vehicle has clocked only 7500 miles and went for its third scheduled serviced in January 2020. I have had no issues whatsoever since I bought. Just today after idling the vehicle for 20 minutes after 30 days.

I have ELM27 OBDII with Pro version of Torque app. When I ran the Fault code diagnostic, I came up with the following errors:
P0300, P0302, P0303, P0353

I don't have any tools to check Spark plugs. Everything is closed including the MB authorized service centre until 17th May.

1. I wanted to know if I should try clearing the fault codes using OBII? as I read in some forum who faced similar issue and after clearing codes, his car's idling went back to normal.

2. If it is safe to drive under 2K RPM till workshop?

3. Anything else I can do?
65785
 

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Wow 30 days without putting it in shipping mode aint good ...
Perhaps the harness / coil / plugs sequence check first and go from there
Though getting to the plugs is a weee bit of a chore (may want to dig up that thread)
Or maybe the piezos are sticking so maybe some serious injector cleaner
 

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oh also ... 30 days ... what gas was in the tank? if it's e10 it may have phase separated ...
 
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