2006 Toyota Yaris 1.0L Petrol · YY06 DWD

Chronic corrosion at the rear suspension mounting points is the defining mechanical concern on this 2006 Toyota Yaris, with two days in March 2026 producing both an initial failure and a subsequent pass after repair. On 12 March 2026 the vehicle failed on two major defects: near-side rear and off-side rear suspension component mountings in the prescribed area were both recorded as excessively corroded and significantly reducing structural strength, alongside a major exhaust leak at the rear. Two days later the car returned and passed, implying remedial welding, section reinforcement, or component replacement was carried out to restore the structural integrity. While the rapid turnaround is encouraging, corrosion of this severity on a 20-year-old vehicle does not exist in isolation, and any prospective buyer should expect that surrounding metalwork, mounting brackets, and adjacent floorpan areas may be similarly compromised. The recorded mileage of 112,020 against an age of roughly 20 years equates to an annual accumulation of approximately 5,600 miles, which is markedly lower than typical for a car of this vintage. This figure points either to genuinely light use over the vehicle's life or, more relevantly given the corrosion pattern, extended periods of relatively low activity punctuated by shorter bursts of higher mileage. The MOT history supports a mixed picture: there is a gap between March 2025 and March 2026, and before that a gap from August 2023 to March 2025, suggesting the vehicle was either off the road for insurance or SORN purposes for parts of those intervals or used only seasonally. Standing periods of this length are particularly relevant on a 20-year-old car because corrosion advances without active use, particularly to underside structural components and brake lines, which continue to deteriorate from internal moisture and surface oxidation even when the car is stationary. Given that the most recent advisories all relate to an underbody covered in underseal, and the recent failure involved prescribed-area corrosion, a close physical inspection beneath the vehicle is essential. The underseal coating can mask serious structural deterioration, so any buyer should arrange for the car to be examined on a ramp where the coating can be probed or even removed in suspect areas, particularly at the rear suspension turrets, the rear axle mounting points, the boot floor, and the inner sills. On a test drive, listen carefully for clonking or knocking from the rear suspension over uneven surfaces, which could indicate either the repaired mountings have not bedded in correctly or adjacent corroded components are now moving. Pay close attention to any deterioration in rear handling or trailing-arm stiffness, and feel for wandering at speed, as weakened rear mounting structure can subtly degrade tracking and stability under load. The earlier August 2023 failure for an excessively worn off-side front suspension arm bush, combined with the most recent rear structural issues, suggests the suspension system as a whole warrants close scrutiny. On the road, listen for any knocking from the front end over bumps, particularly on full lock or over potholes, and feel for vague or imprecise steering response that could indicate worn front bushes or compromised rear geometry. The exhaust leak recorded in March 2026 is also worth verifying visually: inspect the rear section and joints for black soot deposits, listen for ticking sounds from beneath the car on cold start that quieten as the engine warms, and check for any unusual exhaust fumes entering the cabin, which would indicate a more serious leak than originally recorded. Given the vehicle's age, low usage pattern, and the localised but serious structural corrosion already identified, a pre-purchase inspection by a specialist familiar with older Toyota corrosion issues would be a prudent investment before committing to purchase.