2012 Vauxhall Insignia 2.0L Diesel · FN12 YCU

A near pass-fail on the most recent examination reveals the single mechanical risk that defines this Insignia's current standing, with the August 2025 retest clearing only because the nearside rear shock absorber that had failed on fluid leakage a day earlier was replaced in time. While the current roadworthy status is officially clean, the failure pattern itself is informative: a 14 year old vehicle with 166,856 miles relying on original-equipment dampers will inevitably begin sealing fluid, and the fact that this was flagged as a major rather than advisory defect suggests the seal failure was already advanced rather than borderline. The previous cycle in September 2024 likewise required a same-day retest, this time for an inoperative nearside stop lamp, which is a relatively trivial electrical issue but does demonstrate that minor defects have been left to accumulate between annual tests rather than being addressed proactively. The 2023 pass was clean, so the recent two cycles represent a shift from a previously tidy record to one where items are being picked up only when they are serious enough to fail outright, which is worth weighing when assessing future maintenance liability. Against its 14 year lifespan, the recorded annual mileage of approximately 11,918 miles is broadly typical for a vehicle of this age, neither suggesting a low-use garage queen nor an excessively worked high-mileage example. There are no multi-year gaps in the MOT record to indicate long periods off the road, which means the suspension, braking and drivetrain components have all been subjected to fairly continuous use rather than the corrosion-promoting cycles associated with sporadic running. Mileage accumulation appears steady, although the absence of recorded mileages on the test certificates themselves limits the granularity of this assessment. For an Insignia of this age and mileage, the mechanical implication is one of cumulative wear on original-equipment bushes, mountings and consumables rather than any anomaly in how the car has been used. The shock absorber failure is the most pressing component-specific concern for any prospective buyer. Insignias of this generation are known to suffer from rear strut fluid leakage as the internal seal hardens, and when one damper begins to weep the opposite side is rarely far behind, so a close inspection of the offside rear shock for any trace of dampness or staining on the body is worthwhile. On a road test, listen for clonking noises from the rear over speed humps and uneven surfaces, and pay attention to any tendency for the rear to settle unevenly when parked overnight on level ground, as a failing damper will allow the corner to sag. Also feel for excessive floatiness or poor recovery over undulating B-roads, since a compromised damper directly affects both ride control and stopping stability under braking. Beyond the dampers, this generation of Insignia warrants careful attention to the front subframe and lower suspension arms for corrosion, particularly around the rearward mounting points where road salt accumulates, as well as the rear trailing arm bushes which are prone to cracking and splitting with age. The brake system, given the mileage, will almost certainly be due for disc and pad replacement on at least one axle, so any pulsing through the pedal under firm braking or a grinding sensation should be noted. A thorough inspection underneath on a ramp, with particular focus on the rear shock absorber turrets for any surface rust, the exhaust system for corrosion at the joint flexes, and the steering rack gaiters for splits, will give a much clearer picture of the vehicle's true mechanical state than the MOT history alone can convey.