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Hi, perhaps I can help. It sounds like 1 of the 4 catalytic converters may be partially plugged. I would check the fault codes and see if you have codes for misfires on a group of 3 cylinders that share the same converter. If you do then I would suspect that the converter is plugged.
Good morning. I answered your question yesterday because I saw that Anthony has not been online for the last 2 1/2 weeks. If you would like to wait and see if he replies that is fine. I'll be happy to help you otherwise.
What is your description of limp home mode?
The P0410 won't affect the engine running. The P0170 is a fuel mixture fault code and won't typically cause loss of throttle response. You listed the P0170 twice. Is there another code that you didn't list?
That's what I suspected. For this fault code you need to replace the accelerator pedal. When you floor the throttle or engage kickdown your signal from the pedal is dropping out and the throttle goes into limp home mode until you turn the key off.
The pedal does not require programming. The P0120 is a generic fault code that can set for either the pedal or the throttle actuator. The most common failure is the pedal. The possible causes are the pedal, actuator, wiring or ECU. A factory scanner will give you a Mercedes fault code that is more specific. You really should get the car connected to a factory scan tool for a more accurate code reading.
Click on the link below for the possible factory codes.