When considering a used 2003 Mercedes E320, it’s wise to be aware of potential issues that are common with this model year. While the W211 E-Class generation is known for its luxury and performance, certain components and systems require careful inspection due to their age and typical wear. Here are key areas of concern for a 2003 Mercedes E320 buyer:
Radiator and Transmission Fluid Contamination
One significant issue to investigate in a 2003 Mercedes E320 is the potential for radiator failure. A failing radiator can lead to coolant leaking into the transmission fluid. This mixing of fluids can cause serious damage to the transmission, potentially leading to costly repairs or even complete transmission failure. It’s crucial to check for any signs of cross-contamination and inquire about the radiator’s history and condition. While later models may have addressed this, it remains a relevant concern for the ’03 E320.
Sensotronic Brake Control (SBC) System
The 2003 Mercedes E320 is equipped with the Sensotronic Brake Control (SBC) system. This brake-by-wire technology, while innovative, was known to have potential component failures. Mercedes-Benz offered extended warranties on SBC components for 10 years, which, for a 2003 model, has likely expired. Failure of the SBC system can be a serious safety concern and expensive to rectify. Later E-Class models moved away from SBC to a more conventional braking system, highlighting potential reliability concerns with the earlier system. A thorough inspection of the SBC system’s health is advisable.
Electrical System Considerations
The electrical system of the 2003 Mercedes E320 is also something to consider. Earlier W211 models, including the 2003, utilized a dual-battery setup and a separate battery control module. Later models (from 2007 onwards) simplified this to a single battery system. While not inherently problematic, the more complex dual-battery system in the ’03 E320 introduces more components that could potentially fail over time.
Teleaid System Limitations
Owners of a 2003 Mercedes E320 should be aware of the Teleaid/MBRACE system. Early models featured an analog-only system. This analog Teleaid system is no longer functional due to the shutdown of analog networks, unless an expensive hardware upgrade, supported by Mercedes-Benz, has been performed. Features like emergency services, airbag deployment notification, and roadside assistance through the original Teleaid system are likely unavailable without this upgrade.
Navigation System Technology
While not a reliability concern, it’s worth noting the navigation system in a 2003 Mercedes E320. Technology has advanced significantly since then. Later W211 E-Class models, specifically the MY09 vehicles, received a substantially improved hard-drive based navigation system (NTG2.5) with enhanced phone and iPod connectivity. Compared to these later systems, the navigation in a 2003 model will feel dated in terms of features and user experience.
Transmission Fluid Service Interval
For any 2003 Mercedes E320, regardless of its history, understanding the transmission fluid service is vital. It’s generally recommended to perform the first transmission fluid and filter replacement between 50,000 and 70,000 miles. If the service history is unclear, or if the mileage is within this range or higher and the transmission fluid service is undocumented, it’s a maintenance item to prioritize.
Pre-Purchase Diagnostic Check is Essential
Before purchasing a 2003 Mercedes E320, a comprehensive pre-purchase inspection is highly recommended. Ideally, this should include a diagnostic scan using a system like Star Diagnostic. This diagnostic check can reveal stored error logs and current fault codes across all vehicle modules. These logs provide valuable insight into past and present issues, often including mileage stamps and recurrence frequency, which can inform your purchase decision and negotiation. Independent mechanics specializing in Mercedes-Benz vehicles are typically equipped to perform such diagnostic checks, which may be more insightful than a standard dealer inspection in this specific area.
