5 time i have taken my car to dealership for same problem it give me a sign (pre-safe inoperative) and dealership is unable to fix it and i worried because its a safety issue and sign come anytime when i am driving on highway and streets that makes me very uncomfortable drive it to home or work
We bought our brand new car in december 2016. since we bought it, we've had a multitude of things that would go wrong. first, a brake light warning went on for no reason, then our a/c wasn't working which occurred on may 2017. we experienced alot of minor issues including the phone, bluetooth connection, the engine warning light would go on. if you stopped the car, and reset it, this would go away. the "hold brake" for a hill would work and then not work; windows would go down on their own. the sirius radio would work intermittently. on the last incident with the sirius radio, which occurred in july 2018, we took it to the dealer, and we were called and told our car had a water issue. apparently, the sirius module sits under the passenger seat and when broken down, the aformentioned was discovered. it was brought to our attention that mb had issued a technical service bulletin which described symptoms that we had with our car. the bulletin describes the issue as "malfunctions of various control units, and/or on board power supply problems caused by water in the control unit tray under the driver/front passenger seat [dislocated, pinched or leaking condensation hose on the a/c housing which results in water collecting in the a/c housing or leaking, resulting in water entering the interior]. note that when we had the car serviced for the a/c, the dealer said our car was fine, however, when we got the car back, our air conditioning was frigid. - another symptom of this problem. please be aware that, as of this date, mb is refusing to fix the problem.
Electronic shifter stays in neutral after turning off the vehicle and taking foot off the brake while parking. this is a serious design flaw and often causes a dangerous rolling condition after parking until the driver is aware the vehicle is not stopped and in park. no audible alerts or safety warnings are trigged if you do not press park. in one case our vehicle rolled across a parking lot causing serious damage totaling $4,213.95 and could have easily killed someone.
When the vehicle is parked, the door lock will automatically lock on its own - with the keys sill inside the vehicle. this vehicle is equipped with the "keyless go" feature that will allows the driver to lock/unlock the vehicle without using the "keyless remote fob'. as a precautionary measure, if the remote fob is detected in the vehicle, the doors are not to lock. i have two infants and i would load them into the back seats, as i close the rear door, and try to enter the driver seat, all the doors would lock (the remote fob would still be in the vehicle and should prevent the doors from locking). i am now locked out of the vehicle and both infants are locked in. i am not able to open the doors, because the remote fob is also locked in the vehicle. this will also happen if i exit the driver's seat. the doors will then automatically lock when i closed the driver's door, now with both infants locked in the rear seats. fortunately when this happened, it was during the evening on a cool day and i had enough time to retrieve my extra fob to open the doors. if this happened on a very hot day, the potential for a serious or life threatening injury may have occurred. i feel this is a serious defect with the keyless go system. i researched the internet and this defect has happening to multiple people with mercedes benz vehicle. the keyless go system that mercedes uses is implemented into different models across the entire mercedes benz lineup of vehicles they manufacture. so this issues is not isolated to just my make/model mercedes, but multiple makes/models/years that has the keyless go feature installed in it. this defect has happened to me multiple times and i've taken the vehicle to the dealership twice to have this checked out. they stated that they were not able to duplicate the issue or find any fault codes in the computers.
Since leasing this vehicle on december 1, 2016, there have been numerous safety issues with the seat belt, erroneous warning alarms, and the windshield wiper. first, while driving in a snow storm in january 2017, the driver's side windshield wiper went flying off the vehicle. the dealership repaired the windshield wiper. second, while driving on various dates/times, the car began sounding an alarm and a message appeared that the key was not in the vehicle. please see the attached video. the vehicle has been brought into the shop on two different occasions. during the first occasion, the push button was replaced. on the second occasion, the dealership indicated they could not replicate the problem. this is a significant safety concern because the car displays this alarm at random times despite the fact that the key is in the vehicle. the alarm is distracting while driving. lastly, on another occasion, the seat belt went into the seat mechanism preventing the driver from using the seat belt. this was also repaired by mercedes-benz.