2015 Citroen C4 1.2L Petrol · GD15 ERO

Structural corrosion and the degradation of rubber components define the mechanical history of this vehicle, despite a clean pass on 16 December 2025. The record shows a recurring pattern of failures and advisories involving the front and rear sub-frames, the rear axle, and constant velocity boots. While the most recent test recorded no defects, the history indicates a trend of intermittent issues with the braking system and suspension mountings that have required multiple interventions to resolve. An accumulation of 49,302 miles over eleven years represents a low annual average of approximately 4,482 miles. This usage pattern often results in reduced mechanical wear on the drivetrain and engine, but it correlates with the specific failures seen here, such as the splitting of constant velocity boots and the pitting of brake discs. Low-mileage vehicles are frequently more susceptible to the degradation of rubber seals and the onset of surface corrosion on structural components. Attention must be paid to the structural integrity of the underside, specifically the front and rear sub-frames and the rear axle, which have been flagged for corrosion across multiple testing years. During a physical inspection, these areas should be checked for any progression from surface rust to structural weakening. The previous advisories regarding damaged upper Macpherson strut mountings suggest a need to listen for knocking or clunking sounds when driving over uneven surfaces or during low-speed steering manoeuvres. The braking system has shown instability, with a recorded failure for an excessively fluctuating service brake and advisories for pitted and scored front discs. On a test drive, feel for any pedal judder or inconsistent braking pressure that could indicate remaining issues with the discs or calipers. Additionally, while the constant velocity boots and tyre pressure monitoring system were previously addressed, any clicking sounds during full-lock turns should be investigated to ensure the drivetrain repairs were comprehensive.