2009 Mercedes-Benz CLK 2.1L Diesel · AD09 DNX

The most recent DVSA examination on 10 May 2023 resulted in a pass, with the tester recording an advisory concerning front headlamp lens product residue that does not yet seriously reduce light output, a minor for a severely deteriorated offside front anti-roll bar linkage ball joint dust cover, and an advisory noting slight play in both front lower suspension arm ball joints on the control arms. Looking at the broader pattern, the 2023 test shows a measurable decline in condition compared to the entirely clean passes of 2018 and 2019, and it follows a 2021 failure which itself flagged a perished offside front anti-roll bar dust cover alongside non-functioning dipped beam headlamps. The recurrence of the anti-roll bar linkage issue between 2021 and 2023 is a clear indicator that the front suspension consumables are degrading progressively rather than having been properly rectified, and the addition of play in the front lower control arm ball joints suggests that the front end is beginning to demand more substantive attention. Overall, the maintenance trend is one of gradual worsening as the vehicle moves into its seventeenth year, which is consistent with age-related wear of suspension and lighting components on a Mercedes-Benz of this generation. The recorded mileage of 79,172 miles against a 2009 registration equates to an annual average of around 4,657 miles, which is well below the typical usage for a vehicle of this age and points to extended periods of standing or only light, irregular use. While lower mileage preserves the engine and gearbox internals, it introduces its own mechanical risks through calendar-driven degradation of rubber, fluids, and electrical components, and the MOT history confirms two significant gaps where the vehicle was not tested, between 2010 and 2016 and again between mid-2017 and mid-2018. Long idle periods are particularly damaging to moisture-sensitive components such as the headlamp units that failed in 2021, the suspension gaiters and bushes that are now showing deterioration, and the braking system where calipers can seize and discs can corrode unevenly despite low pad wear. A prospective buyer should focus closely on the recurring front suspension advisories, as the anti-roll bar drop links and lower control arm ball joints are wear items that affect both handling and ride refinement, and a test drive should be conducted over uneven surfaces to listen for clonking or knocking from the front end, particularly over speed bumps and during full steering lock where worn ball joints typically produce their most pronounced noise. The steering should also be checked for vague feedback or self-centring issues, which can indicate advancing wear in the front suspension geometry. Given the headlamp failures recorded in 2021, the electrical system warrants a thorough check including the condition of all bulbs, the headlamp levelling mechanism, and the integrity of the wiring loom, as age-related insulation brittleness is common on Mercedes of this era and can cause intermittent faults. Beyond the recorded defects, several age-related items demand physical inspection. The tyres, despite the modest mileage, should be examined closely for sidewall perishing and cracking, as the 2017 and 2020 advisories on rear and front tyres respectively demonstrate that age-based rubber degradation rather than tread wear is the more relevant concern on this car. The 12 volt battery should be load-tested, as a battery that has stood partially discharged for long periods will have reduced capacity even if the vehicle starts readily. Brake discs should be inspected for corrosion ridges on the outer edges and for any binding of the calipers after the vehicle has been released from a handbrake, while all fluid services including brake fluid, coolant, and automatic transmission fluid if applicable should be verified as within their calendar-based replacement intervals rather than relying solely on the recorded mileage. A structural inspection underneath for corrosion, particularly around the wheel arches, jacking points, and subframe mountings, is strongly advised given the vehicle's age and the likelihood of it having been stored outdoors during periods of low use.