Considering a used 2003 Mercedes E320? The W211 E-Class generation, including the 2003 E320, offers a blend of luxury and performance that’s still appealing today. However, like any vehicle of this age, there are specific areas to inspect to ensure reliability and avoid potential headaches. Before you make a purchase, understanding these common concerns can save you time and money.
Potential Problems with the 2003 E320 Mercedes
Several key areas are worth careful examination when looking at a 2003 E320 Mercedes:
Radiator and Transmission Fluid Contamination
One significant issue in early W211 models, including the 2003 E320, is the potential for radiator failure. This failure can lead to coolant leaking into the transmission fluid. Coolant contamination of the transmission fluid is a serious problem that can cause significant damage to the transmission, requiring costly repairs or even a complete transmission replacement. It’s crucial to check the transmission fluid condition. If it appears milky or discolored, it could indicate coolant contamination.
Sensotronic Brake Control (SBC) System Concerns
The 2003 E320 Mercedes is equipped with the Sensotronic Brake Control (SBC) system, an early form of brake-by-wire technology. While innovative, the SBC system has been known for component failures. Mercedes-Benz extended warranties on SBC components for 10 years, but for a 2003 model, these warranties are likely expired. Failure of the SBC system can be a serious safety concern and expensive to repair. It’s advisable to have the SBC system thoroughly inspected by a qualified mechanic.
Electrical System Nuances in Early Models
Early W211 E-Class models, like the 2003 E320, feature a more complex electrical system compared to later models (MY07-). This includes a dual-battery setup and a separate battery control module. While not inherently unreliable, this more intricate system can present more points of potential failure compared to the simplified single-battery system in later models.
Outdated Teleaid System
The 2003 E320 Mercedes utilizes an analog-only Teleaid/MBRACE system. This older system is no longer functional in its original form due to the shutdown of analog cellular networks. While Mercedes-Benz offered an upgrade path, it involves additional expense. For owners seeking modern connected car features, this system will likely be obsolete without upgrades.
Transmission Fluid Service Interval
Regardless of the specific issues, regular maintenance is key to longevity. For any 2003 E320 Mercedes, paying close attention to the transmission fluid is vital. A proactive approach would be to consider a transmission fluid and filter replacement around the 50,000 to 70,000 mile mark if there’s no documented service history.
Pre-Purchase Inspection is Essential
When considering a used 2003 Mercedes E320, a pre-purchase inspection by a knowledgeable mechanic is highly recommended. Ideally, this inspection should include a diagnostic scan using a system like Star Diagnostic. This allows for checking error logs and fault codes across all vehicle modules. These logs can reveal past and present issues, giving you a clearer picture of the car’s condition and potential future maintenance needs. Error logs often provide mileage stamps and recurrence counts, offering valuable insights into the history of any problems. An independent mechanic familiar with Mercedes-Benz vehicles can perform this crucial check, which may not always be readily offered by a dealership.
