2003 Isuzu Trucks NKR 77 Turbo Electric DI 3.0L Diesel · SY03 ASX

Widespread chassis corrosion is the defining issue with this 2003 Isuzu NKR 77, having been recorded as an advisory on every test from 2023 through to the most recent pass on 7 August 2026, accompanied on the last two tests by corrosion on all brake pipes. That latest pass came with advisories for an offside rear inner tyre at 2mm and a deteriorated offside headlamp reflector, but the broader picture is one of a commercial vehicle with a worsening corrosion trend and a chequered recent test history: failures in June 2023 for an insecure fuel tank with a snapped strap, mismatched tyre aspect ratios on the front axle and an illegible number plate; a failure in November 2023 for a leaking fuel hose; and a failure in December 2024 for an inoperative rear fog lamp and registration plate lamp, each rectified for a same-day or near-immediate retest pass. Recurring advisories for wear in the steering idlers and steering box, noted in 2023 and 2024, add to the list of ageing running-gear concerns. Recorded mileage stands at 99,024 miles, roughly 4,305 miles per year over 23 years, which is low for a truck of this type. There is a conspicuous gap in the record between April 2015 and June 2023, an eight-year absence from the testing record that suggests either prolonged periods off the road or use outside the MOT regime, and extended standing is entirely consistent with the perished tyres, corroded brake pipes and fuel system deterioration that surfaced when testing resumed in 2023. The 2014 test also recorded a coolant leak, an oil leak and a rotten nearside rear shock absorber cover, while the 2015 pass noted a shock absorber with a light misting of oil and rear service brake efficiency that only just met the minimum, so braking and suspension wear items were already marginal a decade ago. A prospective buyer should treat the chassis corrosion as the priority inspection item. The advisory wording covers the whole chassis, so the vehicle should be raised on a lift and the frame rails, crossmembers, outriggers and spring hangers probed for section loss, flaking and perforation, particularly around suspension mounting points where structural integrity matters most. The corroded brake pipes warrant equal scrutiny along their full run from master cylinder to each wheel, checking for heavy scaling and any weeping at unions, and the brake pedal should be checked for a firm, consistent feel with no sink under sustained pressure. Given the fuel hose leak and snapped tank strap in the history, the fuel tank mountings, straps and all flexible fuel lines should be examined for chafing, cracking and diesel seepage. On a test drive, the recorded wear in the steering idlers and steering box should manifest as free play at the steering wheel, vagueness around the straight-ahead position, or a tendency to wander requiring constant correction; listen for knocks from the front end over uneven surfaces. Tyres have been a recurring theme, with perishing and cracking noted on multiple corners and one currently at the 2mm legal margin, so tread depths and sidewall condition across all six positions should be verified, and the mismatched front axle fitment from 2023 confirmed as resolved. Finally, the deteriorated headlamp reflector will affect beam pattern and night visibility, and the history of lamp and registration plate failures suggests the lighting circuit and wiring generally deserve a thorough check before purchase.