2006 Toyota Prius 1.5L Hybrid electric · GL55 UTP

The 2006 Toyota Prius passed its most recent MOT on 13 January 2026 at 56,869 miles, but the maintenance trend is worsening. The January 2026 test recorded five advisories, up from zero in January 2024, indicating a clear deterioration in the vehicle's condition over the last two years. The tester flagged corrosion on both rear inner sills, both front suspension arms, and an offside rear brake pipe that was corroded and contaminated with grease or other material. Both headlamp lenses also showed a product reducing light output. While none of these defects caused a failure, the simultaneous emergence of structural corrosion and a corroded brake pipe on a single test is a significant shift from the clean record seen in 2024. The mileage pattern tells a story of very light use followed by a notable gap. Between January 2023 and January 2026, the car covered just 2,648 miles across three tests, averaging roughly 883 miles per year. The annual mileage between 2021 and 2023 was more typical at around 1,400 miles per year. This suggests the vehicle may have stood unused for extended periods during the most recent three-year window. Prolonged standing accelerates the corrosion of brake pipes, suspension components, and structural sills, which aligns precisely with the defects now appearing on the record. A buyer must inspect the undercarriage thoroughly before purchase. The rear inner sill corrosion noted in January 2026 is particularly concerning on a Prius, as these structural areas are critical for long-term integrity. The tester explicitly stated structural rigidity was not significantly reduced at the time of the test, but corrosion of this nature rarely stabilises without intervention. The offside rear brake pipe corrosion combined with grease contamination demands immediate attention, as this combination can mask active deterioration and compromise braking performance. The front suspension arm corrosion, while not deemed seriously weakened in January 2026, should be monitored closely. On a twenty-year-old vehicle with this mileage pattern, suspension bush wear and ball joint condition are equally important to verify in person. The recurring headlamp lens advisories dating back to 2021 suggest the lenses have been slowly degrading for years; replacement or professional restoration would restore proper night-time illumination. Overall, the Prius remains roadworthy today, but the trajectory of its defects points to deferred maintenance and the effects of long-term standing rather than regular use.