2006 Mercedes-Benz C 1.8L Petrol · LS55 EOL

A pattern of recurring lamp failures and brake wear advisories defines the mechanical story of this 2006 Mercedes C-Class, with the most recent assessment on 3 December 2025 producing a pass alongside the same trio of advisories that have appeared at successive tests. The high-level third stop lamp has been flagged as inoperative at both the 2024 and 2025 tests, suggesting an electrical fault in the rear spoiler or housing assembly that has not been rectified. The rear brake discs have attracted a pitted and scored advisory two years running, indicating progressive surface deterioration that, while not yet severe enough to fail, will require disc replacement in the near term. A separate failure event on the same December 2025 date recorded inoperative rear indicators and a non-functioning front position lamp, both straightforward electrical items that were presumably corrected before the pass was issued. An earlier failure in December 2024 had flagged an inoperative engine management indicator lamp and a non-functional front windscreen washer, both of which were also remediated to allow that test to pass. At 78,664 miles on a vehicle now approaching twenty years of age, the recorded accumulation works out to roughly 3,933 miles per year, which is unusually low for a car of this vintage and points to either limited regular use or extended periods of standing. The mileage recorded at the 2023, 2024, and 2025 tests shows only modest annual additions of a few hundred miles between visits, consistent with a vehicle that is exercised infrequently rather than used as a daily driver. Mechanically, such low usage on a Mercedes of this era carries well-known implications for the rubber and polymer components that deteriorate through inactivity rather than wear, including suspension bushes, drive shaft boots, brake caliper slide pins, and the various coolant and vacuum hoses routed around the M271 or M272 engine bay. Brake discs that have sat exposed to moisture without regular drying heat will also pit and corrode far more quickly than the odometer would suggest, which aligns directly with the recurring rear disc advisory on this car. For a prospective buyer, the immediate priorities are the rear brake discs and the third stop lamp circuit. The rear discs, having been flagged two consecutive years, should be inspected for lip measurement, runout, and any visible scoring; on a test drive, any pulsing through the pedal under light braking or a tendency for the rear wheels to grab unevenly would confirm the discs are now beyond their service limit. Replacement of both rear discs and pads together is the sensible course, and the caliper slide pins and carrier should be freed and greased at the same time given the car's low usage. The third stop lamp fault should be traced through the spoiler-mounted housing, the wiring loom that runs into the boot lid, and the connector itself, as broken wires in the boot hinge area are common on this generation of C-Class. The indicator and position lamp failures are likely bulb or connector related but warrant a quick check of the front light clusters and rear lamp holders for water ingress and corrosion. Beyond the recorded items, a close inspection of the underside is strongly advised given the vehicle's age and low mileage, with particular focus on the front suspension control arms, anti-roll bar drop links, and the rear subframe mounting points where Mercedes of this period are known to develop surface corrosion. The engine and automatic gearbox should be checked for any signs of misting or weeping from the sump, valve cover, and gearbox pan, all of which can become more pronounced on a car that has done many short cold-start journeys rather than sustained motorway running. On the road, listen for clonks from the front suspension over speed humps and uneven surfaces, feel for any vagueness or knocking in the steering, and check that the transmission shifts cleanly through all ranges once the oil is fully warm. A coolant system pressure test is also worth requesting, as the plastic housing and thermostat housings on this generation are known to become brittle with age and can fail without warning.