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To answer this without doing any testing would not make sense, some diagnosis is needed to find what area of the motor or oil delivery system is causing your problem. Checking the actual oil pressure with a known good gauge is the first test. Second are the valve lifters making a ticking noise? Are there any abnormal noises coming from the motor? Has the oil been changed recently? You can have a bad oil filter, ( there is an internal valve that can fail and cause low oil pressure). You can have excessive clearance in the connecting rod or main bearings. You can have a low flowing oil pump. So, you need to invest in a little diagnosis before we can really help you. Good luck
As the service letters get deeper into the alphabet, the more labor is expected to complete all the operations the service minder determines are needed. There are check lists and those list have the service items listed with a general mileage and time that a service item is deemed to be needed. Like for coolant it might say 10 years or 150,000 miles. So a "g" service means that if all the check list items are actually needed at the time of service, you can expect to pay for about 6-8 hours of labor. After the "g" service is done you can expect your service minder to display an "a" or "b" service due in 10-13kmiles.
That means there is a transmission related fault present.To find the nature of the fault you will have to have the Powertrain Control Module or PCM, scanned for fault codes and then try to use that information to guide toward the right system or area to troubleshoot. Good luck
There are core plugs that are in that area and if the cooling system is not properly maintained they rust through and leak. There are the same type of plugs at the rear of the engine block too, so those can leak and that leakage can migrate towards the starter. Might want to have a shop add UV dye to your coolant and then pressure test the cooling system, this will ensure an accurate diagnosis. good luck.
The sensor may have fallen out of it's mount and may be touching the radiator or another cooling system component. The sensor is about 2-3 inches long with a cone shaped tip and a two wire connector, There is usually a small round hole near the bottom of the front bumper cover where the sensor pokes through and is exposed to the on coming air. If the wires were broken or disconnected the temp would read -40 degrees. Check the sensor first. Good luck.
You need to find what is the reason for the Check engine light coming on, once you determine that we can get you going in the right direction. Know this, high NOx is caused by too much timing advance, non functioning or restricted EGR system, exhaust leak prior to the catalyst, engine operating temperature being too high, excessively lean mixture and finally bad reduction bed in the three way catalyst. Since your HC and CO emissions are okay, you would have to look at the catalyst, but I would not until I know what triggered the Check engine light to come on. Good luck
Is this a Flex fuel vehicle? If so, may have a bad flex fuel module, it is mounted near the radio. If normal vehicle, need to check fuses, then signal to the fuel tank sending unit, if signal is present at tank, may have a bad sender unit. Rare problem is a bad ground connection for the instrument cluster. Good luck.
I do not recall any recommendations for power steering fluid flush from Mercedes Benz, if your vehicle is equipped with ABC, that fluid should be flushed whenever the height of the vehicle is not maintained when it is parked. I do not believe ABC came on 4matic vehicles. Usually with MB vehicles, the power steering system needs repair before fluid would be flushed, so new fluid is added at that time.
You may have a broken blend door. These vehicles have a plastic door and it is actuated with a small motor. these doors break where they attach to the motor. If this is indeed the case you will have to have the complete heater/AC plenum chamber replaced, close to $1000.00 for this repair if the parts are still available. Good luck
Just a guess, but the flashing lights might be a sign that the anti theft is engaged and that would prevent you from starting the vehicle no matter what. Best to get it to a BMW service shop(not necessarily a dealer) that has a scan tool and have them test it, that test should tell if the anti theft is indeed in no start mode. Good luck.