Peugeot 408
The Peugeot 408 (2022–present) is a distinctively styled crossover-coupe that attempts to blend the practicality of an SUV with the sleek aesthetic of a traditional saloon. As a relatively new addition to the UK lineup, it is a sophisticated, technologically advanced vehicle designed for modern aesthetic appeal. However, its complex suite of digital features and reliance on platform-shared powertrains means that prospective buyers should be prepared for the specific management requirements that come with modern, software-reliant vehicles. A primary focus for owners of the 408 is its "i-Connect" infotainment and i-Cockpit systems, which represent the latest iteration of Peugeot’s digital cabin design. As with other recent models utilizing this architecture, early users have reported intermittent software-related challenges, such as temporary system freezing, laggardly interface response, or minor connectivity drops for smartphone integration. These software-based quirks are often resolved through dealership-applied firmware updates, making it essential for prospective owners to ensure that the vehicle has been kept current with all necessary system enhancements. Mechanically, the 408 is powered by highly efficient engine options, which, while capable, require owners to strictly adhere to maintenance schedules. Whether dealing with the latest petrol iterations or the electrified hybrid options, longevity in these engines is best ensured by regular servicing and the use of manufacturer-specified fluids. Furthermore, like many modern Peugeots, the extensive use of sensor-based driver-assistance technologies means that owners should be mindful that these systems can sometimes be sensitive to UK-specific environmental conditions. While the 408 is a highly attractive and modern family car, its success in long-term ownership depends on the owner’s readiness to keep on top of its digital and mechanical maintenance.
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Common Faults & Reliability
These are the most common documented problems for the Peugeot 408, sorted by their typical impact and frequency.
Infotainment & Software Stability
medium severityThe i-Connect Advanced infotainment system on the 10-inch central touchscreen can suffer from software instability. Users have reported the digital instrument cluster and touchscreen suddenly going black, disabling speedometer, fuel gauge and climate control functions. Navigation can crash or show incorrect GPS positions, and the MyPeugeot app connection may fail. Software restarts or dealer firmware updates are usually required to restore functionality.
1.2 PureTech Wet Belt Degradation
high severityThe entry-level 1.2 PureTech 130 (EB2ADTS) uses a wet timing belt running in engine oil. Although later production uses a timing chain, transitional models may still be fitted with the belt-in-oil design. Degraded belt debris can block the oil pump strainer, causing low oil pressure and potential engine damage. Stellantis has acknowledged premature belt wear on EB-series engines and extended the warranty to 10 years/112,000 miles in the UK for affected units built April 2014 to June 2022.
PHEV On-Board Charger and Traction Battery Faults
high severityPlug-in hybrid 408 models can experience on-board charger (OBC) and traction battery faults, with documented failure codes such as P12F03. The charging system may stop working entirely, leaving the car driveable only on its petrol engine. Spare parts lead times can be extended, and traction battery replacement costs are very high. PHEV buyers should verify that any charging cable recall has been completed and that the HV battery has no fault history.
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