Peugeot 508 (Gen 2) Common Problems & Reliability

The second-generation Peugeot 508 (2018–2024) stands out in the UK executive car segment with its striking, low-slung design, frameless windows, and high-tech "i-Cockpit" interior. While it is a significant improvement in quality over its predecessor, prospective owners must be aware that it is a complex machine with specific mechanical and electrical sensitivities. Diligent maintenance is not optional if one is to avoid expensive repairs common to this generation. A critical point of concern for petrol variants is the 1.2 PureTech engine, which utilizes a "wet belt" timing system that runs submerged in engine oil. The long-term durability of this component is entirely dependent on adhering to stringent service intervals and using the precise oil viscosity mandated by PSA; failure to do so can cause the belt to degrade, with rubber particles potentially clogging the oil pump and leading to catastrophic engine failure. It is imperative that any used 508 features a documented, full service history from a Peugeot Main Dealer. Diesel models (BlueHDi) are fundamentally robust for long-distance users, provided the AdBlue emissions control system is maintained correctly. The internal components of the AdBlue tank, including the pump and sensor, are a documented weak point, with failure typically necessitating a costly full-tank assembly replacement. Furthermore, drivers of diesel 508s should ensure regular motorway driving, as vehicles restricted to short urban journeys are prone to Diesel Particulate Filter (DPF) clogging, a condition that can lead to limp-mode operation and subsequent damage to turbocharger components. Finally, while electrical issues are frequently reported, they usually manifest as non-catastrophic software glitches—such as infotainment freezing or sensor errors—rather than complete system failure. Many of these quirks are resolved through dealership firmware updates. Additionally, owners of the frameless-window models should exercise caution during freezing UK winters, as forcing frozen windows open can damage the regulator mechanism or the seals. With consistent, preventative maintenance, the 508 Gen 2 offers a sophisticated executive package, but it demands an owner who is committed to its specific upkeep requirements.