2018 Mercedes-Benz A-Class 1.6L Petrol · DF67 UBP

The latest MOT test result on 2026-01-27 indicates the vehicle passed with a single advisory regarding front brake discs that are worn, pitted, or scored but not critically compromised. However, the preceding MOT on 2026-01-21 resulted in a major failure due to an engine malfunction indicator lamp (MIL) being inoperative, alongside the same front brake disc advisory. This suggests a deterioration in the vehicle’s overall condition, with the engine system presenting a persistent and critical issue that has not been resolved within the last year. The earlier failures in 2024—specifically concerning the front anti-roll bar ball joints—highlight a recurring problem with suspension components, which may indicate underlying wear or manufacturing defects in these parts. While the majority of MOT results over the past five years have been clean, the recent pattern of failures underscores the need for urgent attention to the engine and suspension systems before the vehicle’s roadworthiness is further compromised. The recorded mileage of 69,139 miles for a vehicle aged approximately eight years represents a moderate annual usage rate of around 8,642 miles per annum, which is typical for a car of this age and class. This figure does not suggest excessive wear from high mileage alone, but rather a steady, consistent pattern of use that could contribute to gradual component degradation over time. However, the presence of long periods between MOT tests—particularly the gap between 2024 and 2026—may indicate either infrequent use or a lack of proactive maintenance. If the vehicle has been driven primarily for short trips or used in conditions that do not stress the engine or suspension heavily, this could mitigate some wear, but it also risks calendar-based degradation of fluids and components that are not actively used, such as brake pads, seals, and lubricants. The anti-roll bar ball joints, in particular, are prone to deterioration from both use and environmental exposure, and their failure in two consecutive MOTs suggests that they may have reached a critical state requiring immediate replacement. For a prospective buyer, the most pressing concerns stem from the recurring front brake disc advisories and the major engine MIL failure. The front brake discs, while not yet failing the MOT due to being "not seriously weakened," are significantly worn, pitted, or scored, which can lead to reduced braking efficiency, uneven tyre wear, and potential brake fluid contamination if metal shavings enter the system. On a test drive, listen for a grinding or squeaking noise from the front brakes during deceleration, and check for uneven tyre wear patterns that may indicate brake disc warping or uneven clamping. Additionally, inspect the brake fluid reservoir for contamination or a low level, as this could signal a failing brake master cylinder or caliper seals. The engine MIL issue is far more critical, as it may point to a failing sensor, wiring, or a deeper mechanical problem such as a misfiring cylinder or fuel system malfunction. A thorough inspection of the engine bay for leaks, unusual noises, or smoke during acceleration is essential, and a diagnostic scan tool should be used to confirm the exact fault code and assess whether it is a minor sensor issue or a more serious engine management problem. If the engine failure is confirmed, the cost of repairs could range from moderate to substantial, depending on the underlying cause. Beyond the immediate defects, the buyer should conduct a comprehensive physical inspection of the vehicle to address potential issues that may not have been flagged by the MOT but are common in cars of this age and mileage. Given the vehicle’s age and the potential for standing or infrequent use, check the tyre sidewalls for signs of perishing, cracking, or dry rot, which can compromise structural integrity and lead to sudden failure. The 12V battery should be tested for voltage and charge capacity, as prolonged inactivity can cause corrosion to the terminals and a decline in performance. Inspect the exhaust system for rust, leaks, or structural weakness, particularly around the catalytic converter and mufflers, as these components degrade over time and can affect emissions compliance. The suspension should be examined for signs of excessive play or binding in the steering, which could indicate worn control arms, bushings, or struts. Finally, since the vehicle has not been serviced in a calendar-based manner (e.g., every 12 months or 15,000 miles), fluids such as the coolant, brake fluid, and transmission fluid should be checked for degradation, contamination, or low levels. A professional service history check would also be prudent to confirm whether the vehicle has received regular oil changes, filter replacements, and other essential maintenance tasks. If the buyer is satisfied with the MOT results but concerned about the engine issue, they may consider a pre-purchase inspection by a qualified mechanic to assess the extent of the problem and provide an accurate cost estimate for repairs.