2018 Renault Master 2.3L Diesel · SC18 LWS

The 2018 Renault Master’s latest MOT test on 2025-05-13 resulted in a failure, with the most critical issue being an active Engine Management System (ECU) malfunction indicated by a persistent Malfunction Indicator Light (MIL), which requires immediate attention. This failure follows a pattern of recurring advisories and minor defects over the past four years, particularly in brake system integrity, tyre wear, and lighting components. While earlier MOTs in 2022 and 2023 showed no major defects aside from minor windscreen chips and headlamp alignment issues, the 2024 and 2025 failures highlight a concerning trend of persistent mechanical wear and potential underlying issues, such as corrosion in the brake pipes and front wheel bearing wear. The vehicle’s roadworthiness is compromised by the ECU fault and the need for urgent rectification of the brake system corrosion and wheel bearing, which could escalate into costly repairs if ignored. The recorded mileage of 140,402 miles for a vehicle aged eight years represents a notably high annual usage rate of approximately 17,550 miles per annum, which is significantly above the average for its class. Such high mileage, particularly over an extended period, accelerates wear on critical components like brakes, suspension, tyres, and drivetrain elements. The absence of substantial mileage gaps suggests consistent, heavy usage, which may have contributed to the observed corrosion in brake pipes and premature tyre wear, particularly on the offside front and near-side rear tyres. The near-side rear tyre’s edge wear could indicate uneven loading or suspension misalignment, while the offside front tyre wear may reflect lateral forces or misaligned steering geometry. For a vehicle of this age and mileage, the wear patterns suggest that the owner has likely driven it under demanding conditions, potentially including frequent stop-and-go traffic or off-road use, which further compounds the risk of accelerated component failure. Given the recent MOT failures and recurring advisories, the prospective buyer should prioritise a thorough mechanical inspection to address the immediate roadworthiness risks. The Engine Management System (ECU) fault must be diagnosed and repaired by a qualified technician to prevent further damage to the catalytic converter, oxygen sensors, or fuel system, which could lead to increased emissions or engine performance degradation. The front wheel bearing failure from 2024 is critical; a rough or grinding noise when rotating the wheel, particularly near the near-side front, should be investigated immediately. The brake pipe corrosion advisories—particularly the greasy deposits—indicate a potential fluid leak or contamination risk, which could compromise braking efficiency. Inspect the brake hoses for cracks or leaks, and ensure the brake fluid is clean and at the correct level; a fluid change may be necessary if the brake system has been exposed to moisture or contaminants. Beyond the immediate concerns, the buyer should conduct a comprehensive physical inspection of the vehicle’s structural and fluid integrity. Given the high mileage and the age of the vehicle, focus on the following areas: check the tyre sidewalls for signs of perishing or cracking, which can compromise their structural integrity and increase the risk of sudden blowouts; verify the condition of the suspension components, including coil springs, shock absorbers, and suspension bushes, for signs of excessive play or wear that could lead to handling issues or uneven tyre wear. The near-side rear sill damage from the 2025 MOT may require further investigation to ensure no structural integrity issues exist, especially if the vehicle has been subjected to significant impacts or road debris. Additionally, test the brake system for binding calipers, uneven braking, or a spongy pedal, which could indicate warped discs, seized components, or hydraulic issues. Finally, since the vehicle has been in use for several years, consider a full fluid service, including the brake fluid, coolant, and transmission fluid, as these fluids degrade over time and can lead to premature component failure if not replaced. A detailed service history check would also be beneficial to confirm whether scheduled maintenance, such as timing belt replacement or spark plug servicing, has been completed.