Peugeot 408 1.2 PureTech 130 Mk1

The 408 PureTech 130 uses the EB2DTS engine with a timing belt running submerged in engine oil. Under certain conditions, particularly with short-trip driving, degraded oil, or extended oil change intervals, the belt deteriorates earlier than its official 100,000 km / 6-year replacement interval. Rubber fragments circulate through the oil system, blocking the oil pump pickup screen and contaminating VVT solenoids. In severe cases the belt snaps, causing catastrophic piston-to-valve contact. Preventive belt replacement costs approximately €800-1,000 at an independent shop. If engine damage occurs, a rebuild or replacement runs €3,500-5,000. Stellantis extended warranty coverage to 10 years / 180,000 km from March 2024, conditional on adherence to the manufacturer's service schedule. Unlike the 308 P5, which partially switched to a Gen3 timing chain from mid-2023, the 408 PureTech 130 retains the wet belt across its production run. Only the PHEV and mild hybrid variants use a timing chain.

The 1.2 PureTech engine is prone to carbon buildup on piston rings due to its direct-injection design. When the piston oil control rings become coked, oil passes into the cylinders and burns off. Some owners report consumption of 0.5 to 1.0 litre per 1,000 km, which Stellantis considers within tolerance up to 0.5 L per 1,000 km. Root causes include infrequent oil changes, incorrect oil specification, and predominantly short-trip driving where the engine rarely reaches full operating temperature. The PCV valve can also contribute (€150-250 to replace). Mild cases are managed by regular oil level checks and top-ups, costing approximately €100-200 per year in additional oil. Severe cases require piston ring decoking (€800-1,200) or an engine top-end rebuild at €2,500-3,000. Using the correct PSA B71 2312 specification oil and changing it annually or every 10,000 km significantly reduces this risk.

Turbo failure on the 1.2 PureTech is typically a secondary consequence of wet timing belt degradation or excessive oil consumption rather than a standalone fault. When belt fragments contaminate the oil, turbocharger bearings suffer from reduced lubrication. Oil coking from degraded oil compounds the problem. Symptoms include loss of boost pressure, blue exhaust smoke on acceleration, whistling from the engine bay, and limp mode. Failure usually occurs between 80,000 and 150,000 km, but earlier if oil maintenance has been neglected. Replacement costs €1,200-2,500 depending on whether a new or remanufactured unit is fitted. Before replacing the turbo, it is critical to inspect the oil system for belt fragment contamination, as a new turbo will fail quickly if the root cause remains.

The 408 uses Stellantis's latest infotainment platform with a 10-inch central touchscreen. Early production models suffer from software instability: the screen freezes mid-drive, the system reboots spontaneously, Bluetooth audio cuts out, and Apple CarPlay or Android Auto disconnects. Some owners report blackouts almost every other day. Forum posts indicate Peugeot stopped releasing updates for some 2023 models running IVI software version 1.20.80.20, treating the platform as end-of-life. In most cases the issue is software-related and resolved by a dealer firmware update (free). However, persistent problems may require head unit replacement at €800-1,200. A temporary workaround is holding the power button for 10 seconds or removing and reinserting fuse 28 to force a reboot.

LSPI is a phenomenon affecting small turbocharged direct-injection engines including the PureTech. Oil droplets or fuel residue ignite prematurely in the combustion chamber at low rpm under moderate load, creating extreme pressure spikes. Symptoms include hesitation, low-speed knocking or stuttering around 2,000 rpm during gentle acceleration, and an engine fault code. Stellantis has issued a technical service bulletin with a diagnostic procedure starting with an oil and filter change, followed by intake valve cleaning, and in severe cases injector or engine replacement. Using the correct oil specification (PSA B71 2312, typically 0W-30), higher octane fuel (98 instead of 95), and avoiding prolonged low-rpm high-load driving reduces the risk. Minor LSPI damage may only need spark plug or injector replacement (€500-800), while severe piston damage leads to engine rebuild (€3,000-5,000). A separate TSB addresses early spark plug failure, where the original specification plugs could disintegrate and damage the cylinder, with updated Bosch ZR5 plugs recommended as replacements.

The Aisin-sourced 8-speed EAT8 torque converter automatic is generally reliable but some owners report jerky shifts at low speeds, particularly between 1st and 2nd gear in urban traffic. Occasional delayed engagement from standstill and harsh downshifts have also been documented. Some 408 owners report the gearbox staying in 1st gear up to 28 km/h after driving on inclines. In most cases a software recalibration at the dealer resolves the issue for €100-300. More serious cases may require valve body replacement at €1,500-2,500. Regular transmission fluid changes every 60,000 km are recommended despite the manufacturer claiming a lifetime fill. Independent garage cost for an EAT8 fluid change is approximately €200-350, compared to €400-600 at a dealer.

As a direct-injection engine, fuel is sprayed into the cylinders rather than over the intake valves. Without this fuel-wash effect, carbon deposits accumulate on the backs of the intake valves over time. Symptoms include rough idle, slight misfires, increased fuel consumption, and reduced power. These typically become noticeable between 60,000 and 100,000 km, though drivers who only do short trips may see issues earlier. Professional walnut blasting or chemical cleaning costs €400-800 at a specialist workshop. Regular motorway driving at higher rpm helps slow the buildup. This is inherent to all direct-injection petrol engines, not a flaw specific to the PureTech.