2016 Citroen C3 1.6L Diesel · RE16 FXU

The latest MOT test on the 2016 Citroën C3 recorded a failure in September 2025, with the most critical issue being a compromised near-side front drive shaft constant velocity (CV) joint boot, which no longer effectively seals the joint against dirt ingress—a failure that directly compromises the integrity of the drivetrain’s lubrication system and could lead to accelerated wear of the CV joint and associated seals. While the vehicle passed the preceding MOTs, the recurring oil leak advisories and the presence of worn brake discs and pads suggest a pattern of maintenance neglect or underlying mechanical degradation, particularly in the suspension and drivetrain components. The combination of these advisories and the recent failure indicates a trend of worsening roadworthiness, warranting immediate attention to prevent further damage, particularly to the CV joint and associated seals, which could result in costly repairs if ignored. The recorded mileage of 173,561 miles for a vehicle aged approximately ten years represents a high annual usage rate of around 17,356 miles per year, which is notably elevated for a car of this age. Such high mileage typically correlates with increased wear on consumables like brake pads, tyres, and suspension components, as well as accelerated degradation of seals, gaskets, and lubricants. The absence of significant mileage gaps between MOT tests suggests consistent use, which may have contributed to the observed wear patterns, particularly in the brakes and suspension. However, the rapid accumulation of miles over a decade without corresponding service intervals could have exacerbated wear on critical drivetrain and suspension elements, necessitating a thorough inspection to confirm the extent of any underlying damage beyond what the MOT records reveal. For the prospective buyer, the most pressing concern is the compromised CV joint boot, which must be addressed immediately to prevent further contamination of the CV joint and potential failure of the drive shaft. During a test drive, listen for unusual clunking or grinding noises from the front wheels, particularly when transitioning between acceleration and deceleration, as these could indicate CV joint or boot failure. Inspect the CV boots visually for signs of damage or wear, and check for excessive play or binding in the drive shaft assembly. The oil leak advisories suggest that the engine’s oil retention system may be compromised, which could lead to increased oil consumption and potential long-term engine damage if not rectified. A thorough oil change and inspection of the oil filter, oil seals, and valve cover gasket are strongly recommended, along with checking for any signs of oil contamination in the brake fluid reservoir or transmission fluid. In addition to the immediate issues, the brake system shows signs of wear, with multiple advisories indicating thin brake pads and worn discs, particularly on the near-side front and rear. On a test drive, monitor for brake pedal softness or sponginess, uneven braking response, or a pulsating sensation that could indicate warped brake discs or binding calipers. Inspect the brake discs for corrosion, pitting, or scoring, and the pads for excessive thickness loss or glazing. The coolant leak advisory raises concerns about the integrity of the cooling system, which could lead to overheating if not addressed. Check for coolant leaks under the vehicle, particularly around the water pump, radiator hoses, and cylinder head gaskets, and ensure the coolant level is topped up and the system is functioning correctly. Given the vehicle’s age and mileage, it is advisable to verify the service history for fluid changes, particularly the engine oil, coolant, and brake fluid, as these fluids degrade over time and should be replaced in accordance with manufacturer recommendations. Finally, conduct a visual inspection of the tyres for sidewall cracking or perishing, which can occur due to age-related degradation, and ensure they meet the legal minimum tread depth. A comprehensive mechanical inspection by a qualified technician is strongly recommended to assess the full extent of wear and damage beyond what the MOT records indicate.