The 2003 Mercedes-Benz E320 remains a sought-after model in the used car market, lauded for its blend of luxury and performance. However, like any vehicle of this age, potential buyers should be aware of specific issues that may arise. This guide delves into the common concerns associated with the 2003 Mercedes E320, providing valuable insights for those considering purchasing this classic sedan.
One significant area of concern for the 2003 Mercedes E320 is the potential for radiator failure. A radiator malfunction can lead to coolant contamination of the transmission fluid, a serious problem that can result in costly transmission repairs or even failure. While later models may have addressed this issue, it’s a crucial point to inspect in a 2003 E320. Checking the transmission fluid for any signs of coolant contamination is highly recommended before purchase.
Another critical system to consider is the Sensonic Brake Control (SBC). The 2003 Mercedes E320 was equipped with this brake-by-wire system, which, while innovative for its time, is known for potential component failures. Mercedes-Benz discontinued SBC in favor of the Adaptive Brake system in later models (MY07-). It’s worth noting that SBC components on the 2003 E320 originally had extended warranties for 10 years, but those warranties have now likely expired. Therefore, a thorough inspection of the SBC system’s health is paramount.
Moving to the electrical system, the 2003 Mercedes E320 utilizes a dual battery setup and a separate battery control module, a more complex system compared to the simplified single-battery configuration found in later (MY07-) non-SBC models. While not inherently problematic, this older electrical architecture adds complexity and potential points of failure.
For models prior to MY07, including the 2003 E320, the Teleaid/MBRACE system is another factor to consider. Earlier cars featured an analog-only system, which may no longer be functional without an expensive equipment upgrade. While some owners may have benefited from lifetime basic service for emergency features in the past, the analog system’s obsolescence is something to be aware of, especially if modern connectivity is a priority.
Regarding maintenance, it’s generally advised to perform the first transmission fluid and filter replacement between 50,000 and 70,000 miles for all W211 E-Class models, including the 2003 E320. Regular transmission fluid changes are crucial for maintaining the longevity and performance of the transmission.
Given these potential areas of concern, a pre-purchase inspection is highly recommended for any 2003 Mercedes E320. Ideally, this inspection should include a diagnostic scan using a Mercedes-Benz Star Diagnostic system. This professional-grade tool can access error logs and current fault codes from all vehicle modules, providing invaluable insights into the car’s history and current condition. Error logs can reveal not only the nature of past faults but also when they occurred and how frequently they’ve recurred, offering a comprehensive picture of the vehicle’s health. Consulting with an independent Mercedes-Benz mechanic who has access to Star Diagnostics is a wise step before committing to a purchase.
In conclusion, while the 2003 Mercedes E320 offers a compelling blend of luxury and driving experience, prospective buyers should be diligent in assessing potential issues related to the radiator, SBC brakes, electrical system, and Teleaid. A thorough pre-purchase inspection, including a Star Diagnostic scan, is essential to make an informed decision and ensure a reliable ownership experience.
