2005 Mercedes-Benz C 1.8L Petrol · OV05 WBZ

The most recent MOT test on this Mercedes-Benz C-class occurred in December 2024, where it passed with a single advisory—rear direction indicator discolouration—followed by a subsequent failure in the same test session due to an active engine malfunction indicator lamp (MIL) and a failed washer fluid system. The pattern of MOT results reveals a mixed but ultimately concerning trend. While earlier tests in 2023 and 2022 were clean apart from minor lighting faults, the recurring engine-related failures in 2024 and 2022—particularly the major MIL issues—suggest a persistent underlying electrical or mechanical issue that has not been resolved. The 2017 failure, with a brake fluid warning lamp and dipped beam headlamp failure, indicates a history of critical drivetrain and electrical system failures that may have been overlooked or not fully addressed. These repeated defects point to either a neglected long-term problem or a more acute, perhaps recently emerging, component failure requiring immediate attention. The vehicle’s recorded mileage of 151,498 miles over approximately 21 years represents an average annual usage of around 7,214 miles, which is within the expected range for a car of this age and model year, particularly if it has been used primarily for commuting or light road travel rather than high-mileage driving. However, the absence of a service history or clear maintenance records makes it difficult to determine whether the mileage accumulation has been gradual or if there were periods of high usage followed by extended idling. The oil leak advisories from 2017 and 2019 suggest persistent fluid loss, which, if unchecked, could lead to increased wear on seals, gaskets, or engine components over time. The potential for rapid mileage accumulation in certain periods could also imply higher stress on suspension, brakes, and drivetrain systems, exacerbating wear and the likelihood of failure points like those seen in the MOT history. Given the recurring engine-related failures and oil leak advisories, the buyer should prioritise a thorough inspection of the electrical system, specifically the engine control unit (ECU) and related wiring, as well as the engine bay for signs of fluid leaks, particularly around the oil pan, valve cover, and oil filter housing. During a test drive, listen for unusual engine noises such as knocking, ticking, or hesitation, which could indicate internal engine issues or failing injectors. Check for any oil leaks under the vehicle, particularly around the rear main seal, oil filter housing, and coolant hoses, as these could be contributing to the persistent oil loss. The brake system should also be inspected, with particular attention to brake fluid levels, for signs of contamination or fluid degradation, given the prior brake fluid warning lamp failure. If the brake discs or pads show signs of uneven wear or corrosion, or if the calipers appear binding, this could indicate a need for further investigation into the braking system’s integrity. For physical checks beyond the MOT history, the buyer should examine the tyres for sidewall cracking or perishing, which can occur even at low mileage due to age-related rubber degradation. Given the vehicle’s age, the tyres may have reached their recommended tread life, and replacing them could improve handling and safety. The battery should be tested for voltage and capacity, as older vehicles are prone to battery failure, especially if the MIL issues suggest prolonged electrical system strain. Inspect the suspension for signs of wear, such as cracked or stiffened coil springs, worn suspension bushes, or excessive play in the struts, which could lead to clunking noises or poor ride quality. The exhaust system should be checked for leaks, rust, or structural integrity, as corrosion can compromise emissions control and structural integrity over time. Finally, since the vehicle has not had a recent service, the buyer should verify the presence of any service book stamps or receipts for critical fluid replacements, such as coolant, brake fluid, and transmission fluid, which degrade over time regardless of mileage.