Mercedes esp warning and no throttle responce

Try pressing the ESP button for 3 seconds, (See photo), to check you haven't pressed the button by accident. If not, try this website.

Mercedes ESP light warning How to RESET it yourself

Here is an article that could help:
Mercedes ESP light warning How to RESET it yourself

You would need a scan tool connected to the vehicle to clear the warning but there is no point unless the issue causing the fault light has been rectified. Without the fault being identified correctly and fixed the warning will come back on next time you drive the car.

You can reset all lights by disconnecting the negative lead to your battery for about 30 seconds. This will reset them but if the problem is not fixed they will come back on in about 50 miles.

The ESP and BAS warning lights may illuminate due to a failed brake light switch. Replacement of the failed switch should correct this concern. A recall on certain 2000-2002 models have been recalled for a related issue

The vehicle enters limp mode.

P0643 is a generic code. Sensor reference voltage high. This would indicate a possible wiring issue somewhere. This could be on the electronic throttle module somewhere as it is triggered by using the throttle. Unfortunately it doesn't sound like a simple cheap fix. Look for a mercedes independant commercial garage in your area to have a look at it.

The ESP system means the Electronic Stability Program. If the ESP lights on the dashboard permanently the ESP system is faulty.
You should access the ESP Electronic Control Unit (ECU) memory for pull out all DTC (Diagnostic Trouble Codes), using diagnostic equipment connected to the data link connector of the car. Then you will be full informed about bad pieces (e.g.: brake pedal switch, front right wheel abs sensor interrupted, ...). After bad pieces replacement you will be able to erase all faults memored by ESP ECU, in other words reset the ESP system and turn off the warning lamp on dashboard.

Check & replace if necessary the brake pedal switch placed above pedals on the support.
If the problem still occurs you should access the ABS & ESP ECU (Electronic Control Unit) using diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC (Diagnostic Trouble Codes) memored.
Then you will be able to replace bad piece(s) and fix the problem by erasing all DTC stocked inside ABS & ESP ECU, and reset it.

is it diesel, drive by wire or cable? is the pedal hard like stone and doesnt move? if its electronic then the sensor is prob bad. if its cable and hard the throttle body needs to be cleaned to free up the butterfly or plate

i own m b 270 class e.i start ,i go for about 100 or 150 mets then my car lose the power.i remove the key & restart ,again the same problem,if some on can help me

you need a scanner to reset this. carquest sells one, if you intend to keep the car