2014 Mazda CX-5 2.2L Diesel · OV64 NEY

The most recent MOT test for this 2014 Mazda CX-5 occurred on 2025-09-09, where it failed due to a major defect—specifically, the absence of the brake hydraulic reservoir cap, which is a critical component for maintaining hydraulic brake system integrity. This failure contrasts sharply with the preceding five MOTs, all of which passed without any recorded defects, suggesting a sudden and unexplained oversight in the vehicle’s maintenance or inspection process. The pattern of passing tests followed by a single failure indicates that while the vehicle has generally maintained roadworthiness, there is an urgent need to address the hydraulic reservoir cap deficiency to prevent potential brake system compromise. The absence of further failures in the intervening period does not mitigate the risk of this critical omission, as brake systems are designed to be fail-safe, and a missing cap could lead to air ingress, reduced braking efficiency, or even catastrophic failure under heavy load. The recorded mileage of 33,790 miles for a vehicle aged approximately 12 years represents a remarkably low annual usage rate of around 2,816 miles per year, which is unusually low for a car of this age and model. Such low mileage often correlates with prolonged periods of inactivity, particularly if the vehicle was stored under adverse conditions—such as exposure to moisture, extreme temperatures, or neglect of routine maintenance tasks. While low mileage can reduce wear on consumables like tyres and fluids, it also raises concerns about potential issues stemming from prolonged standing, such as corrosion in the brake system, binding calipers due to rust, or degradation of seals and gaskets that have not been flushed or replaced. Additionally, the lack of recent servicing could mean that time-based maintenance, such as fluid changes or belt replacements, has not been conducted, which is particularly critical for a vehicle that has not been driven frequently. For a prospective buyer, the most pressing concern is the missing brake hydraulic reservoir cap, which must be replaced immediately to restore the vehicle’s compliance with roadworthiness standards. Upon inspection, verify that the cap is securely fitted and that the brake hydraulic system has been flushed to remove any air or contaminants. During a test drive, listen for any unusual brake pedal feel—such as sponginess, hardness, or reduced responsiveness—which could indicate trapped air or a failing master cylinder. Additionally, check for uneven brake disc wear or excessive heat marks, which may signal underlying hydraulic issues. The advisory from the 2023 MOT regarding the serpentine belt being worn to excess should prompt a replacement before it fails catastrophically, causing engine damage. Listen for rattling or squeaking noises when the engine is running, and ensure the belt is properly tensioned and aligned. Beyond the immediate defects, given the vehicle’s age and low mileage, a thorough inspection should focus on several key areas. First, examine the tyres for signs of sidewall cracking or perishing, which can occur even with low mileage if the vehicle has been stored in a damp or cold environment. Check the tread depth and look for irregular wear patterns, which could indicate alignment or suspension issues. Next, assess the battery for signs of corrosion on the terminals, particularly if the vehicle has been left unused for extended periods. A weak battery can lead to electrical gremlins, such as malfunctioning windows, lights, or the starter motor. Inspect the exhaust system for leaks or rust, as prolonged inactivity can accelerate corrosion in the catalytic converter and muffler. Finally, since the vehicle has not been serviced in several years, consider checking the fluid levels—particularly the engine oil, brake fluid, and coolant—and replace them if they appear degraded or old. Time-based maintenance, such as replacing the serpentine belt and checking the suspension bushes, should be prioritised to prevent long-term wear and tear.