2016 Ford Fiesta 1.5L Diesel · AM66 ADM

The 2016 Ford Fiesta’s most recent MOT test on 2025-11-13 resulted in a passing outcome, marking a return to compliance after a failure in the preceding test conducted just six months earlier. This pattern indicates a notable inconsistency in the vehicle’s emissions performance, with the 2025 failure highlighting an exceedance of the manufacturer’s specified limit for exhaust emissions, which is a critical safety and environmental concern. While the intervening MOTs from 2023 to 2024 were clean, the recurring issue suggests either a persistent underlying problem—such as a faulty catalytic converter, exhaust manifold leak, or fuel system inefficiency—or a need for deeper diagnostics to address the root cause before the emissions system is compromised further. The advisory from 2024 regarding the rear registration plate deterioration, though non-critical for roadworthiness, underscores a minor but persistent issue that could become problematic if the plate becomes unreadable or misaligned, particularly in automated number plate recognition systems. The recorded mileage of 21,791 miles for a vehicle aged approximately ten years represents a relatively low annual usage rate of around 2,179 miles per annum, which is significantly below the average for its class. Such low mileage often reflects periods of stationary use, particularly if the vehicle was parked for extended durations, potentially leading to accelerated wear in certain systems. For example, standing vehicles can experience corrosion in brake discs and calipers due to friction material buildup and oxidation, as well as fluid degradation in the hydraulic brake system and coolant, which may not be detected by routine MOT testing but could manifest as binding calipers, spongy pedal response, or brake shudder during operation. Additionally, suspension components like coil springs, shock absorbers, and suspension bushes may show signs of wear from infrequent use, with bushes potentially stiffening or clunking when driven, and springs becoming less effective over time. Given the vehicle’s low mileage and clean MOT history apart from the emissions failure, the buyer should conduct a thorough physical inspection to address potential hidden issues arising from prolonged inactivity. Focus on the brake system, checking for corrosion or binding on the discs and calipers, which may cause uneven wear or a grinding noise when braking. Inspect the hydraulic brake fluid for contamination or discolouration, as this can indicate fluid degradation, and ensure the brake master cylinder and reservoir are clean and free of debris. The suspension should be examined for signs of bush wear, with particular attention to the rear suspension bushes, which may exhibit stiffness or clunks when the vehicle is driven at low speeds or over bumps. Tyres should be checked for sidewall perishing, which can occur from age alone, even without significant mileage, and ensure the tread depth is within legal limits. The exhaust system, particularly the catalytic converter and manifold, should be scrutinised due to the recurring emissions failure. Look for signs of rust, leaks, or discolouration around the exhaust components, as these can indicate underlying issues contributing to the emissions exceedance. The fuel system, including the injectors and fuel pressure, may also warrant attention, as inefficiencies here can lead to poor combustion and emissions problems. For fluid systems, consider servicing the coolant and brake fluid according to the manufacturer’s recommendations, ideally within the last 12 months, to mitigate risks of corrosion and hydraulic failure. Additionally, the 12V battery should be tested for charge capacity and terminal cleanliness, as prolonged disuse can lead to sulphation or corrosion, compromising the vehicle’s starting ability. Finally, a professional diagnostic check of the emissions system, including a scan tool readout, would be prudent to confirm the root cause of the previous failure and prevent recurrence.