2015 Citroen C4 1.6L Diesel · YP15 PYS

The latest MOT test for the 2015 Citroën C4 on 2026-01-15 reveals a concerning pattern of major defects, indicating a significant decline in roadworthiness over the past year. The vehicle failed due to a critically worn near-side front suspension arm ball joint, which is a severe failure that compromises steering control and lateral stability, often accompanied by excessive play or clunking noises when the steering wheel is turned or the vehicle is driven over bumps. Additionally, the anti-lock braking system (ABS) warning lamp persisted, suggesting a persistent fault in the ABS control module or sensor wiring, which may lead to reduced braking effectiveness or erratic pedal response. The engine malfunction indicator lamp (MIL) was also inoperative or indicated a malfunction, pointing to deeper electrical or engine management issues that could affect fuel efficiency, emissions, and long-term reliability. While earlier MOTs from 2020 to 2024 were clean, the sudden onset of these major failures suggests either a failure to address prior advisories or underlying mechanical wear that accelerated post-2024. This trend is alarming and raises serious concerns about the vehicle’s structural integrity and safety, warranting immediate attention before purchase. Given the lack of recorded mileage data, it is impossible to accurately assess the vehicle’s annual usage rate or whether the recent failures coincide with high mileage or prolonged inactivity. However, the 2015 model year with no mileage figure typically suggests either a high-mileage vehicle or one that has been driven infrequently, potentially leading to wear issues from prolonged standing or neglect. If the vehicle has accumulated significant mileage—say, over 100,000 miles—then the front suspension ball joint failure could be attributed to cumulative stress, while the ABS and engine faults may indicate electrical or mechanical wear from heavy use. Conversely, if the mileage is lower, the failures might stem from neglect, such as delayed servicing or lack of regular maintenance, which can exacerbate hidden wear. Either way, the recent MOT failures suggest the vehicle has either been subjected to excessive stress or has suffered from maintenance lapses, both of which are critical factors to investigate further. Given the recent MOT failures, the prospective buyer must conduct a thorough mechanical inspection to confirm the severity of the defects and plan immediate corrective action. Start by visually inspecting the near-side front suspension arm for signs of excessive wear, such as cracked bushings, bent or broken components, or oil staining around the ball joint. Listen for clunking or rattling noises when driving over bumps or turning, as these are telltale signs of a failing ball joint. The ABS system should be tested by observing pedal feel—if the brake pedal feels spongy, erratic, or requires excessive force, or if the vehicle pulls to one side during braking, the ABS fault is likely active and requires professional diagnosis. The engine MIL should be addressed immediately, as persistent faults may indicate a failing sensor, wiring issue, or more serious engine management problem. If the ABS and engine issues are confirmed, a full electrical system check is essential to isolate the root cause, as these problems can compound if left unresolved. If the buyer proceeds with the purchase despite these failures, they must prioritise repairs to restore roadworthiness before use. The suspension ball joint replacement alone could cost between £200 and £400, depending on labour and part costs, and should be done as soon as possible to prevent further damage to the steering system. The ABS fault will require a diagnostic scan to identify whether it is a sensor, wiring, or module issue, with costs ranging from £100 to £300 for parts and labour. The engine MIL should be investigated by a qualified mechanic, as persistent faults may require a new ECU, sensor replacement, or more extensive engine work. In the interim, the buyer should avoid driving the vehicle until these issues are resolved, as the compromised suspension and braking systems pose significant safety risks. Additionally, the tyre advisories from 2019—near-side front and rear tyres worn close to legal limits—should be addressed promptly, as worn tyres increase the risk of hydroplaning, poor traction, and premature tyre failure. If the tyres are beyond legal limits, they must be replaced before the vehicle is put back into service. Beyond immediate repairs, the buyer should also consider a full service check, including fluid top-ups, filter replacements, and a general mechanical health assessment, to identify any further wear or neglect that may have contributed to the recent failures.