1998 Mercedes-Benz SL 3.2L Petrol · S339 AGX

Recurring issues with the supplementary restraint system and persistent tyre degradation define the mechanical profile of this Mercedes-Benz SL, which successfully passed its most recent MOT on 19 June 2026. While the vehicle has maintained a functional status across its testing history, the presence of identical fault codes for the SRS warning lamp in both 2014 and 2026 suggests a recurring electronic or sensor-related instability within the safety restraint architecture. The current record shows a pattern of tyre-related advisories that have remained consistent through the latest inspection, indicating that the vehicle has been subjected to prolonged periods of inactivity or storage that have compromised the structural integrity of the rubber compounds. With a recorded mileage of 69,766 over 28 years, the vehicle averages approximately 2,492 miles per annum, a figure that highlights significant periods of disuse rather than consistent operational cycles. The lack of test records between 2015 and 2025 indicates a decade-long gap in DVSA-monitored roadworthiness, during which the vehicle was likely taken off the road. This extended storage period is a critical factor for a vehicle of this age, as static components such as brake lines, rubber bushings, and hydraulic seals are prone to deterioration when not subjected to the regular heat cycles and lubrication associated with frequent driving. Prospective buyers should prioritise a thorough inspection of the braking system, specifically the rear brake lines which were flagged for corrosion in multiple tests between 2012 and 2014. Given the long gap in testing, these lines require a physical assessment for scaling or pitting that could compromise hydraulic pressure. During a test drive, pay close attention to the pedal feel; any sponginess or excessive travel may indicate air in the system or internal seal degradation within the master cylinder or calipers, which can occur when a vehicle remains stationary for extended durations. The tyre advisories noted in the 2026 test confirm that the current rubber is suffering from age-related perishing and sidewall cracking, necessitating immediate replacement to ensure safe handling and structural integrity. Furthermore, the recurring SRS warning light fault requires a diagnostic scan to determine if the issue stems from a faulty seat occupancy sensor, a clock spring failure, or a loose connection within the airbag harness. Listen carefully for any unusual noises from the suspension during the test drive, as the rubber bushes and ball joints may have stiffened or cracked during the vehicle's long-term storage, potentially leading to knocking sounds or vague steering feedback when traversing uneven road surfaces.