2009 Mercedes-Benz C 2.1L Diesel · ST59 FLW

The most recent MOT test on this 2009 Mercedes-Benz C took place on 2026-04-07 and resulted in a clean pass, indicating no active defects at that time. However, the vehicle’s MOT history reveals a pattern of recurring issues that have fluctuated between advisories, major failures, and dangerous conditions over the past seven years. The most critical failures occurred in 2024-03-20 and 2023-03-25, where dangerous brake pipe leaks and excessive oil leaks were recorded alongside severe tyre wear below the legal minimum. The 2026 failure—particularly the fractured front coil spring and contaminated anti-roll bar ball joints—suggests that while the vehicle has avoided immediate roadworthiness risks in the most recent test, underlying mechanical degradation remains a persistent concern. The engine-related MIL (Malfunction Indicator Lamp) issues from multiple years also indicate unresolved electrical or sensor problems that could escalate if left unattended. The vehicle’s recorded mileage of 180,238 miles at the time of this assessment aligns with a typical annual usage rate of approximately 10,602 miles, which is consistent with moderate, regular use rather than either light or heavy exploitation. Given its age, 17 years, this represents a reasonable accumulation of wear, particularly on high-mileage components such as the suspension, brakes, and drivetrain. The absence of significant mileage gaps suggests the car has been in regular service, though the presence of multiple MOT failures over a short period may imply either suboptimal maintenance or an underlying mechanical weakness that has only recently become apparent. Rapid mileage accumulation in certain periods could also indicate more aggressive driving conditions, which would accelerate wear on consumables like brake pads, tyres, and lubricants. For a prospective buyer, this Mercedes-Benz C presents a number of critical areas to inspect and address promptly. The recurring brake pipe corrosion and grease accumulation across all four pipes is a major red flag, as it suggests long-term exposure to moisture and road salt, which can lead to catastrophic hydraulic failure. On a test drive, listen for uneven brake pedal travel or a spongy feel, which may indicate air in the system or a compromised brake pipe. The fractured front coil spring and contaminated anti-roll bar ball joints from the 2026 MOT failure necessitate immediate suspension inspection, including checking for binding calipers, excessive play in joints, or signs of spring failure (e.g., sagging or clunking when driving over bumps). The excessive oil leak from the engine in 2024-03-20 warrants a thorough inspection of the valve cover gasket, oil pan gasket, and oil filter housing gasket, as well as checking for oil contamination in the brake fluid reservoir, which could indicate a cross-contamination risk. Beyond the immediate defects, the vehicle’s age and mileage demand attention to several time-sensitive issues. The worn and pitted brake discs from previous MOT advisories suggest that the braking system may be nearing the point where pads or discs will need replacement, which could exacerbate the hydraulic concerns if not addressed soon. The nearside front tyre showing wear close to the legal limit in 2021-03-02, combined with the rear tyres failing MOT in 2024-03-20, means that tyre replacement is overdue, particularly given the potential for uneven wear from suspension or alignment issues. For the engine, the persistent MIL issues indicate that a comprehensive diagnostic check of the sensors, wiring harnesses, and fuel injection system is essential to prevent further electrical failures. Additionally, given the vehicle’s age, the 12V battery should be tested for capacity and corrosion, and the alternator output should be verified to ensure it can maintain charge under load. Finally, fluid checks—particularly brake fluid, coolant, and transmission fluid—should be performed to account for calendar-based degradation, as these fluids can become gelled or contaminated over time, even without significant mileage.