2020 MG ZS 1.0L Petrol · LG20 AAO

An emissions deficiency now defines the vehicle’s MOT picture: the June 2026 test recorded a major failure for exhaust carbon‑monoxide content at idle and for the lambda reading after the second fast idle, both of which breach the statutory limits. Although a separate entry for the same date shows a pass with no defects, the recorded major emissions failures would have prevented a legal pass until remedial work was carried out, indicating that the exhaust control system is currently out of specification. At six years old the car has logged only 34,158 mi, roughly 5,700 mi per annum – well below the average for a vehicle of this age. The low annual accumulation suggests limited on‑road use, which can be favourable for wear‑dependent components but may also point to extended periods of inactivity. There are no gaps in the MOT chronology; the car has been tested each year, providing a consistent record of its condition despite the modest mileage. For a prospective buyer the emissions failure should be the first focus. Verify that the oxygen (lambda) sensor, catalytic converter and associated wiring are functional; a faulty sensor or a clogged converter are common culprits. During a test drive listen for a lean or rich exhaust note, note any hesitation on acceleration, and watch the exhaust for excessive smoke or unusual colour. A pre‑purchase emissions test or a diagnostic scan can confirm whether the fault is sensor‑related or requires more extensive exhaust work. The 2023 tyre advisories highlight uneven tread wear: the off‑side front tyre was close to the legal limit on the inner edge, while the near‑side rear and off‑side rear showed slight cracking or perishing. Inspect all four tyres for tread depth, sidewall integrity and any signs of cupping or feather‑edge wear, which could indicate mis‑alignment, worn suspension bushes or uneven loading. While driving, feel for any vibration through the steering wheel or seat that may betray a tyre or suspension issue, and check that the vehicle tracks straight without pulling to either side. Addressing these tyre concerns before committing to purchase will help ensure the car remains road‑worthy beyond the next MOT.