2017 Mercedes-Benz SLC 2.0L Petrol · SE66 NEO

A pattern of intermittent major failures regarding fuel delivery and exhaust emissions defines the mechanical profile of this vehicle, despite its recent pass on 30 October 2025. The inspection history shows a lack of continuity in clean passes, with the 2025 test following a failure for a leaking nearside front fuel hose mounted on the gearbox. This follows a 2024 failure where the exhaust lambda and hydrocarbon readings exceeded specified limits during fast idle testing. While the most recent result shows no defects, the presence of these specific major failures indicates that the vehicle has required intervention for both fuel system integrity and engine combustion efficiency within the last two years. The recorded mileage of 23,216 miles over a nine-year period represents an unusually low annual average of approximately 2,580 miles. Such a low accumulation rate suggests the vehicle has spent significant periods stationary or has been used strictly for short-distance trips. Mechanically, this usage pattern can lead to different wear profiles than a high-mileage vehicle; while drivetrain and suspension components may show less physical wear from road friction, components such as seals, hoses, and exhaust sensors can be subject to degradation from age and infrequent thermal cycling rather than mileage. Prospective buyers should pay close attention to the fuel system and exhaust integrity during a physical inspection. Given the 2025 failure involving a leaking fuel hose on the gearbox, it is necessary to check for any residual scent of fuel or visible dampness around the engine bay and fuel lines. On a test drive, the engine should be monitored for any hesitation, stumbling, or erratic idling, which could indicate that the previous emissions failures or fuel leaks have had a lasting impact on the fuel delivery system or the oxygen sensors. The 2024 failure regarding high hydrocarbon and lambda readings necessitates a thorough check of the exhaust system and engine management. During the test drive, listen for any irregular engine notes or signs of incomplete combustion, such as excessive smoke from the tailpipe under acceleration. It is also advisable to ensure the vehicle reaches its operating temperature smoothly and maintains a stable idle, as the previous emissions failures suggest the combustion process has previously struggled to meet regulatory standards.