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Mercedes-Benz CLS550 Questions

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I was driving one minute and within 5 mins, it would not start. All the lights and music was still working. Battery was fine. I thought with the electronic system that I would have gotten some kind of warning that the starter was going bad.
I changed the compressor and I also changed the air Springs and still nothing need the location of the compressor pump relay
I replaced the light bulb but it still doesn't work. Is there a fuse that controls this light. If so, where is it located. Also, any other options to explore?
driver side front lowers to low when in park starts to rise when door is unlocked and continue when starting. Rides well
I used a tank of 87 OCTAIN gas in my 2012 MB CLS550. The engine light came on today so figured that may be the reason. I went to AUTO ZONE a purchased a 16 oz Lucas Deep Clean Fuel System Cleaner and filled the tank with 91 octain BP gas. I drove 36 miles to try to get the fuel in the system but the engine light is still on. The car ran smooth with no problems. The light just came on today.
2007 CLS 550 I added coolant and the check engine light came on.
This is my first time of changing the battery, when I tried starting d car it will only idle for a few seconds and then cuts off, av tried dis. Severally but keeps doing d same thing, even the radio don't come up anymore.
Unable to close the trunk with the power button due to the wires being severed when closing the trunk manually.
Just appeared last night
no codes came up on OBD scanner
My front and back is low I started car and let it run it never change 2007cls 550 the back was low an the past ,But when I started car it would rise.This is the first time front and back was low.
I check the 50 amp fuse on the passenger side I jump the relay pump come on but don't rise I also changed the fuse box under the hood still no power to the 40 amp fuse. Please help me
Second try to start got transmission malfunction third try it said remove button and use key did nothing fourth tour of key it was no power period.
So it has factory hid (xenon) lights they work perfectly fine when engine is not running, when i start the engine after a few seconds hids start flickering and dont stop. Every other lighy works fine high beams/taillights just hid having issues
I realized the front was slamming down.
Do I replace the airmatic compressor or air shook?
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