2005 Mercedes-Benz SLK 1.8L Petrol · G4 JCN

The January 2026 test at 91,290 miles returned a pass, but only after a failure twelve days earlier exposed a cluster of active faults including an SRS warning lamp, an illuminated engine MIL, an illegal offside rear tyre and a broken exhaust mounting. The maintenance trend is clearly worsening; the tester continues to flag the same rear brake hoses, thin pads and pitted discs that appeared as advisories in 2024 and 2025, while new structural damage to bodywork and persistent engine management faults indicate deferred upkeep rather than routine wear. Mileage accumulation remains low and consistent, averaging roughly 3,500 miles per year since 2018 with no unexplained gaps or sudden spikes. The car covered 3,122 miles between the 2025 and 2026 tests, a figure that aligns with the long-term pattern and suggests the vehicle spends long periods stationary, a condition that often accelerates brake hose degradation and tyre sidewall cracking despite low tread wear. Recurring engine MIL failures appear in six of the last eight tests, spanning 2018 through 2026, pointing to an unresolved emissions or sensor fault that garages have cleared temporarily to secure a certificate rather than diagnosed fully. The braking system demands immediate attention: rear discs are pitted and scored, pads are thin, both rear hoses are damaged and the parking brake failed on efficiency and single-side operation in 2024. Front shock absorbers have shown light oil misting since 2024, and the 2018 failure for an excessively worn offside lower ball joint should be verified as rectified. Sharp edges on broken light assemblies recorded in 2025, combined with the broken rear exhaust mounting still present in 2026, complete a picture of a car where cosmetic and safety items are being neglected. A pre-purchase inspection must focus on the MIL root cause, full rear brake overhaul, suspension bush and ball joint integrity, and the structural condition of the rear subframe mounting points.