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Prestige Auto Works
You may have a problem with a switch and it could be an easy fix. Our $90 diagnostic fee will be waived with the repair.
Maybe you are referring to the neutral safety switch? This repair will run about $160-200
Most of the braking power is in the front (maybe only 30% in the rear). The front brakes will wear out quicker than the back. Also it will depend on how you stop your vehicle - if you make sudden or quick stops frequently in town they will wear quicker than if you drive down the freeway for a long distance. If you are around 30,000 + miles, it's no surprise that you may be due for new brakes in the front.
Please confirm that the correct oil was used and that it is at the proper level. A technician may offer try an engine treatment. Be very clear on all the information for the vehicle so they can accurately diagnose your noise.
It would be safest to take it to your mechanic. They may need to also bleed the brake system - in addition to topping off the fluid.
There are multiple things that may contribute to it idling rough. When you turn your air conditioning on it ads more load to the engine, and also the a/c compressor pulley is engaged. You may have a vibration from weak motor mounts, or the engine may actually be running rough if the air or fuel mixture is incorrect. I would recommend a diagnostic inspection, so you don't have to keep guessing at repairs.
You'll need to sync the key with your system. In short it needs programing. We can do that here with our Mercedes scan tool, same as the Mercedes dealer.
Check the reverse light fuse - does it has power to it? The fuse can be ok, but not have power to it.
If indeed your battery has excellent health, we would check to make sure it's getting enough fuel or spark to start quickly.
All wheel drive (AWD) vehicles need to be trailered. Your CLK430 will be Rear wheel drive (RWD), so at least the rear wheels need to be lifted during a tow.