2015 Citroen C4 1.6L Diesel · OU15 YLA

The 2015 Citroen C4 presents a concerning pattern of recurring technical failures across its nine-year MOT history, with three separate failures recorded between September 2022 and October 2024 before stabilising with two passes in late 2024 and early 2025. The most recent test on 2025-10-17 showed the vehicle passing with only minor issues: a windscreen damage that does not impair visibility and a minor oil leak advisory. However, this clean result sits atop a trajectory of deteriorating reliability, beginning with a double failure in September 2022 involving child-seat belt inspection problems, rear brake disc scoring, fluctuating service brakes, and compromised driveshaft constant-velocity joints. Subsequent tests through April 2024 repeated these failures with increasing severity, including major issues such as an offside front upper anti-roll bar dust cover allowing dirt ingress, significant rear inner brake disc wear, and nearside front outer drive shaft boot insecurity. The current pass appears to be a marginal recovery rather than a resolution to underlying systemic problems. With 127,447 recorded miles on a 2015 model, the vehicle accumulates approximately 11,600 miles annually, which aligns with expected wear patterns for a car of this age. The mileage progression reveals no dramatic spikes or sudden drops, suggesting consistent operational use rather than periods of prolonged inactivity. Notably, the gap between the failed test on 2023-10-06 and the subsequent pass on 2024-10-17 spans several months with no intermediate MOT entry, indicating the car may have been stored or serviced during this interval. The steady accumulation rate implies moderate daily driving or regular commuting, which would reasonably account for the progressive brake and suspension degradation observed in the test history. While the mileage itself is not exceptional, the combination of moderate usage and the documented failure pattern suggests that many consumable components have reached end-of-life thresholds. The lower suspension arm pin and bushing reported in the 2021-01-08 MOT shows progressive wear that could compromise ride quality and handling if left unaddressed. During a test drive, pay close attention to how the front suspension responds when hitting small bumps or potholes; uneven or hard-floating behaviour indicates the worn bush may still allow some movement. Listen for any clunking or knocking sounds through the chassis when cornering, particularly on rough pavement where the worn front lower arm could transmit vibration. If the vehicle feels loose or labyrinthine in the front suspension geometry during lateral movement, this supports the diagnostic concern raised in the 2021 test and warrants immediate replacement before further structural stress develops. The repeated brake-related failures—particularly the nearside rear inner brake disc showing significant wear and the nearside front outer driveshaft constant-velocity boot splitting—increase the likelihood of braking performance degradation and potential drive shaft failure under load. When driving, monitor the brake pedal for any pulsation or spongy feel, especially during deceleration from speed or when approaching a stop. A soft or inconsistent pedal response, combined with audible grinding or squealing from the rear caliper area, suggests the rear inner brake disc has progressed beyond safe operating limits. For the driveshaft system, inspect the boot seals while the vehicle is stationary and then observe whether any dirt or debris enters the joint during wheel rotation; a split or insecure boot at the constant-velocity connection typically leads to grease contamination and accelerated wear of the CV joint bearings, which could manifest as a clicking noise when turning or increased play in the rear axle. These specific symptoms should be verified during a professional pre-purchase inspection before committing to this purchase.