FAQs—Mercedes Benz ML55 AMG
The accelerator pedal of my Mercedes-Benz ML55 AMG is sticky, which gives me a hard time to accelerate smoothly. Why is it sticky and how can it be fixed?
Your car's drive-by-wire accelerator pedal/system has probably deteriorated and needs to be replaced. You would need to bring your car to a Mercedes specialist since these units need coding and computer calibration for this problem to be addressed.
My car is having cranking problems, and the check engine light turns on when this happens and it doesn't turn off immediately. Why is this happening and how can it be fixed?
Your car's engine has defective crankshaft position sensors that malfunction when the engine is hot. When the engine has cooled down, they should eventually restart. Open the hood of your car to help the engine cool down faster. Moreover, it would be best for you to have the crankshaft position sensors replaced as soon as you can.
The air conditioning (AC) system of my Mercedes Benz ML55 AMG is not working. There seems to be no problem with the compressor and clutch. Can I use a store bought can of coolant to recharge my AC?
The recharge kits sold at parts stores are terribly erroneous when it comes to recharging the R134a air conditioning system in your car. Instead, you should have the AC system completely evacuated and recharged using a refrigerant charging station to ensure that the proper amount of refrigerant is in the system. In addition, it would be better for you to buy a set of air conditioning gauges than just a recharge kit. This is because the former is able to check the high and the low side pressures while the latter only measures low side pressure.
Look at the pressure readings to see if the compressor is pumping. However, the pressure readings will still not tell you if there is sufficient refrigerant in the system. If you have a low side pressure gauge and you connected it to the system and the gauge showed "recharge," you can add one can of coolant. Then, check if the pressure comes up and the AC system starts working well.
My fuel gauge has stopped working, and I'm wondering why this happened. How can I get my fuel gauge to start working again?
In cases like this, it is usually a faulty fuel level sender/sensor in the fuel tank that causes the fuel gauge to stop working. The small gauge on the fuel level sender/sensor can fail and when it does, it usually defaults to empty, reads incorrectly, or gives intermittent readings. The fault codes need to be checked in the engine computer. If a code has set for your fuel level sender/sensor, this indicates that you need to replace the fuel pump assembly.
The power steering in my Mercedes Benz ML55 AMG felt stiff and I had to replace it with a new one. However, the problem is still there, and it is also causing my brake sensor lights and alarm to turn on. What is causing this problem?
This could indicate a faulty Speed Sensitive Power Steering valve as it is an intermittent fault. You can replace the valve separately, but the rack has to be removed to gain access.