2009 Mercedes-Benz C 2.1L Diesel · LM59 BCZ

The most recent MOT test on 2025-12-29 resulted in a passing outcome, though it was preceded by a failure on the same date due to a persistent engine malfunction indicated by the Malfunction Indicator Lamp (MIL). While the 2025 MOT shows a return to compliance, the recurring advisory regarding brake disc wear—both front and rear—suggests a pattern of gradual deterioration in the braking system, particularly on the front discs, which were noted as pitted or scored in 2023. The failure in 2024 and 2025 for the MIL indicates a critical issue that has not been resolved, which could point to deeper engine management or electrical system problems. The overall maintenance trend is inconsistent, with intermittent failures and advisories that suggest either suboptimal servicing or underlying component wear that has not been fully addressed. The recorded mileage of 33,025 miles for a vehicle aged approximately 17 years represents an unusually low annual usage rate of around 1,943 miles per year, which is far below the typical expectations for a car of this age and model. Such low mileage often correlates with prolonged periods of inactivity, particularly if the vehicle has been stored for extended periods without regular use. This can lead to specific issues such as standing corrosion in brake components, particularly calipers and discs, which may have contributed to the observed wear advisories. Additionally, low-mileage vehicles are more susceptible to wear from static electrical discharge, fluid degradation over time, and potential issues with the 12-volt battery due to prolonged disuse. The absence of significant mileage accumulation also raises questions about whether the vehicle has been subjected to rigorous driving conditions, which could accelerate wear on suspension, drivetrain, and exhaust components. For a prospective buyer, the most critical areas to inspect are the braking system, given the recurring MOT advisories on brake disc wear and the potential for binding calipers from prolonged inactivity. On a test drive, listen for uneven brake pedal travel, excessive vibration or shuddering during braking, and any signs of caliper drag or binding—particularly on the front discs, which show the most severe wear. Check for uneven brake pad thickness and inspect the discs for scoring, warping, or excessive glazing, which could indicate underlying mechanical issues or poor maintenance. Additionally, verify that the brake fluid level is adequate and that there are no leaks around the brake master cylinder or caliper seals, as low fluid levels or contamination can exacerbate disc wear. Beyond the brakes, examine the vehicle’s suspension and steering components for signs of play or excessive noise, especially from the front suspension bushes, coil springs, or control arms. Given the low annual mileage, pay particular attention to the condition of the tyres, as original tyres may have begun to perish or crack, particularly on the offside front tyre noted in previous MOTs. Check for sidewall cracking, dry rot, or tread depth inconsistencies, ensuring they meet the legal minimum of 1.6mm. Inspect the coolant level and condition, as low levels or contamination can lead to overheating and further engine stress. Finally, test the 12-volt battery’s charge and ensure all electrical connections are clean and secure, as prolonged disuse can lead to corrosion or failure. If the battery is over 5 years old, consider replacing it to prevent future electrical issues. Additionally, review the service history for the engine and transmission, particularly around the time of the MIL failure, to confirm that all required maintenance—such as oil changes, timing belt replacement, and spark plug servicing—has been completed. If the service records are incomplete, arrange for a thorough pre-purchase inspection to address the unresolved engine issues and ensure the vehicle’s roadworthiness and reliability.