W211 e200 1.8 year of construction 2003
Engine code: 271 941

Reason: Engine was defective (car did not start), bought a used engine and replaced the old one.

Problem is not solved with this, car starts now and runs. Only indicates the following error messages:

- misfire cylinder 2
- serial dynamo interface, no connection to control unit n3 / 10
- catalyst defect
- SRS restraint system defective in dashboard
- indicates that all electronic devices are disabled in the dashboard
- red battery message in the dashboard

What has been done so far?
- Sam module replaced in the rear of the trunk
- dynamo overhauled (and has been tested)
- Battery checked at the rear and was ok
- replace the front auxiliary battery
- replace motor wiring harness
- replace the spark plugs
- replace ignition coils

Compression measured:
Cylinder 2: 95
Cylinder 1 2 3: 155

An important point:

When starting the car, the engine vibrates violently after a few seconds and the car has no ability to accelerate properly. But when the car is started and immediately driven away, the car do not vibrate and the car also has its power to accelerate. The car only starts to vibrate after the car is put in neutral or below 1000 rpm.

The car also smells to gasoline when turned on.

Next steps I am considering:

- Contact the seller of the used engine and indicate that the engine is not in order and install a different engine.

- I wonder if the ECU may be the culprit? What do you think?