2005 Mercedes-Benz A-Class 1.5L Petrol · OV05 HBY

The defining mechanical story of this 2005 A-Class is a persistent and unresolved issue with the offside front drive shaft CV boot, which has been flagged across three consecutive tests. A major failure was recorded on 2021-11-25 when the boot was found split and no longer preventing ingress of dirt, and although subsequent tests in 2022 and 2023 returned a pass, the deteriorated boot was recorded as a minor defect on both occasions, indicating that the same component has remained a concern for at least two years without evidence of corrective replacement in the test record. Beyond this drivetrain concern, the broader MOT history is reasonably stable, with only one other failure episode in 2020 relating to a non-functional offside headlamp, an inoperative nearside rear stop lamp, and a parking brake lever with excessive movement, all of which were resolved for the following test. A pattern of recurring advisories is also evident, including rear brake disc wear and corrosion, exhaust gas leaks at the front-to-mid joint, and deterioration of the rear registration plate, all of which have appeared multiple times across the recorded tests. The recorded mileage of 101,027 miles over approximately 21 years equates to an annual accumulation of roughly 4,800 miles, which is notably low for a vehicle of this age. This pattern is consistent with either extended periods of low use or significant intervals off the road, both of which carry specific mechanical implications. Long standing times can accelerate corrosion on brake discs, degrade rubber components such as CV boots, drive belts, and suspension bushes through dry rot, and lead to moisture accumulation in the braking system and clutch hydraulics. The fact that rear brake disc corrosion has been flagged as an advisory in 2019, and pitted or scored rear discs noted in 2018 and again in 2022, aligns with this pattern of low-mileage use rather than heavy wear. The gap between the 2019 and 2021 tests also suggests the vehicle may have been off the road during that period, which would compound the risks associated with prolonged standing. A prospective buyer should pay particular attention to the offside front drive shaft during any inspection. The CV boot has been flagged as deteriorated in the most recent two tests, and a worn or split boot will allow grease to escape and contaminants to enter the joint, leading to accelerated wear and eventual failure. On a test drive, listen for rhythmic clicking or knocking from the front of the vehicle, particularly when turning at low speed, and feel for any vibration through the drivetrain. Inspect the inside of the front wheels for fresh grease splatter on the suspension arm or behind the wheel rim, which would indicate an active boot failure. Given the recurring exhaust leak advisories at the front-to-mid joint since 2018, the exhaust system should be physically inspected for black soot deposits around joints and hangers, and any ticking or exhaust fumes inside the cabin should be noted as a safety concern. The rear brake discs, noted as corroded and pitted on multiple occasions, should be checked for excessive runout or judder under braking, and the handbrake mechanism, which required adjustment in 2020, should be tested on an incline to confirm it holds without excessive lever travel. Additionally, given the low annual mileage, the vehicle's age means that age-related degradation of rubber and electrical components is likely regardless of distance travelled. The headlamp issue from 2020, where the offside dipped beam was not working and could not be aimed tested, warrants confirmation that both headlamps operate correctly and that the lens product residue noted in 2022 has not further reduced light output. The 2021 advisory noting both front tyres worn close to the legal limit on the outer edges suggests a possible tracking or suspension geometry issue, which should be investigated by checking for uneven tyre wear across the full tread width and by feeling for pulling to one side during the test drive. The front suspension should be assessed for knocking over uneven road surfaces, paying particular attention to the lower wishbones and anti-roll bar drop links, as these are common wear items on A-Class vehicles of this vintage. Finally, given the multi-year recurring advisories, it would be prudent to budget for replacement of the CV boot assembly, rear brake discs, and exhaust front section as foreseeable near-term expenditure.