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I am the owner of a 2015 E220 Bluetec W212 NIGHT EDITION vehicle.
The vehicle had a comprehensive service record from Mercedes, documenting its maintenance history up to 48,000 miles. During a family vacation, the engine management light (EML) illuminated while we were in a remote location. Given the circumstances, we were around 58 miles away from the closest Mercedes-Benz dealership. We promptly contacted Mercedes-Benz for assistance, but were informed that they were completely booked and unable to address the issue until the following week.

The individual in question opted not to operate the vehicle and instead chose to have it inspected at a reputable local garage in order to identify any potential issues. The garage utilized a Snap on scanner and determined that the problem lay with the nox sensor, specifically sensor 2 bank 1 upstream. Additionally, they observed that the stop-start function on the dashboard was displaying an amber light. The garage, while acknowledging that they were not specialists in Mercedes-Benz vehicles, speculated that the issue could be related to the nox/eco system or potentially low battery voltage. Upon examination, the main battery exhibited a voltage reading of nearly 14 volts, while the auxiliary battery registered approximately 13.8 volts. The technician cross-referenced this information and confirmed that these voltage levels were satisfactory, as the system's minimum requirement is 12.4 volts.

The individual said that the interruption and resumption of the ecosystem's functioning is likely to be associated with the NOx sensor. They also mentioned that there is no noticeable decrease in power or acceleration, but they are uncertain about any potential impact on fuel economy since they have not driven a significant distance since the engine management light (EML) appeared.

The engine's revolutions per minute (RPM) remain at about 800 when at idle. Is there a potential danger associated with operating the vehicle under these conditions?I rented a vehicle for a week and transported my E220 back to my residence. Subsequently, I accessed my Mercedes Me online account and scheduled a diagnostic appointment for my vehicle. Additionally, I observed that a Mercedes-Benz dealer performed a Diesel software update on my car, although no specific date was provided. It is worth noting that my vehicle underwent servicing at a Mercedes-Benz facility in May of this year.

After doing study, it has been determined that the diesel software upgrade is really associated with the NOx sensor.

It is evident that Mercedes-Benz is aware of the issues pertaining to their car eco systems and NOx sensors, as shown by the release of an update. It is expected that comprehensive testing should have been conducted at Mercedes-Benz facilities prior to the vehicles being sold to consumers. This approach to doing business is not considered optimal.

Additional investigation is required.

Fox Williams LLP, a law firm based in London, is working together with Hagens Berman, a class-action law firm in the United States, to develop a collective legal action in England and Wales. This action aims to assert that Mercedes intentionally committed emissions fraud in the sale of its diesel and BlueTec vehicles. The allegation is that Mercedes employed a software device during testing that manipulated emissions levels, thereby restricting the detection of unlawfully elevated and hazardous Nitrogen Oxide (NOx) emissions that would typically occur in real-world driving situations.

I have been a long-term user of Mercedes-Benz vehicles for a period of 35 years. I am now taken aback by the recent operational practices of the business, as I had never anticipated the need to explore other automobile options. I intend to await the response from Mercedes-Benz after the completion of the diagnostic process, and then share the findings. In the event that the results are unsatisfactory, I will proceed to engage with the London-based legal firm, Fox Williams LLP.

The Mercedes brand is now involved in a legal dispute that is currently continuing. The Mercedes Collective Action has successfully secured the necessary funding, as announced by Slater + Gordon.

What specific consequence do you anticipate?

If the product is covered by a warranty, the issue will be diagnosed and repaired by the appropriate party. If the vehicle does not have a complete service history, it is advisable to seek good fortune, since the possibility of receiving a goodwill gesture from the manufacturer may be contingent upon the aforementioned condition being met.

These legal firms are directing their attention on the issue of emissions, namely the case of Volkswagen where it was found to be emitting a higher amount of Nitrous oxide than permissible limits. The malfunction of the NOX sensor is not relevant to the issue at hand. It is my opinion that the aforementioned situation will persist for a considerable duration, since pursuing legal action against MB will prove to be a formidable undertaking.

The implementation of software upgrades aimed at rectifying the emissions manipulation practices has resulted in the occurrence of failures in nitrogen oxide (NOx) sensors. Therefore, there exists a connection between all elements under consideration.

It seems that the batteries were assessed while the engine was operational, which might provide an inaccurate measurement. It is important to evaluate the batteries while the vehicle is stationary. Insufficient voltage in either battery, even if just slightly low, can impede the correct functioning of the stop/start system.
Uncertain as to whether the Nox problem would impede the occurrence of the same issue, the mere presence of the EML would enough to inhibit the start/stop action.

I am uncertain as to why you did not persist in continuing to operate the vehicle. The malfunctioning sensor does not necessarily affect the functionality of the adblue system. However, due to the sensor's inability to provide confirmation, it assumes a fault in the adblue system. Even if the adblue system is indeed faulty, it will not cause any damage to the engine, but it will result in emissions that do not meet the specified standards.
Although adblue systems, including those in Mercedes-Benz vehicles, are known to have various issues, the specific concern at hand pertains to an eight-year-old automobile that requires repair. The decision to address this issue may be made by opting for either Mercedes-Benz or an independent professional. The relevance of the aforementioned matter to initiating legal proceedings against MB is unclear.

This is becoming one of the most mentioned difficulties on forums. Conduct a comprehensive search on the forum platform to explore a multitude of experiences shared by other owners. Although it is possible that some owners may not encounter these issues, I personally would not contemplate purchasing a vehicle equipped with Bluetec technology.

Upon encountering the first Nox sensor malfunction, Mercedes-Benz provided me with a courtesy vehicle, despite the unavailability of the sensors and their inability to provide an estimated timeframe for the resolution of the problem with my automobile. The individuals provided an explanation, advising against operating the vehicle due to the presence of an illuminated engine light. They emphasized that should any more faults arise, the driver would be unable to discern them, since the light is already illuminated.