Peugeot 308 T9 1.2 PureTech

The 1.2 PureTech uses a wet timing belt that runs inside the engine oil. Over time, unburned fuel dilutes the oil, which degrades the rubber belt material. As the belt deteriorates, fragments circulate through the oil system and can block the oil pickup strainer, starving the engine of lubrication. Gen1 engines (2014-2017) are most affected; Gen2 (2017-2021) uses improved belt materials but the design remains. PSA originally specified a 180,000 km replacement interval, later reduced to 100,000 km or 6 years. Preventive replacement costs €800-1,000 at an independent shop. If the belt fails catastrophically, engine rebuild or replacement costs €3,000-5,000. Stellantis issued recall JZR for vehicles built March 2013 to April 2017, and has extended warranty coverage to 10 years / 175,000 km for belt and oil consumption related repairs.

Many 1.2 PureTech engines, particularly those built between 2014 and 2018, consume oil at rates far exceeding normal. The root cause is carbon buildup on the piston oil control rings, which prevents them from scraping oil properly. Contributing factors include short trips that prevent the engine from reaching full operating temperature, and infrequent oil changes. Some owners report using 1 litre every 1,000-1,500 km. Mild cases can be managed by checking oil frequently (€200/year in extra oil). Severe cases require piston ring decoking (€800-1,200) or engine rebuild (€2,500-3,000). Valve stem seal replacement has also resolved this for some owners at around €600-800. Stellantis covers this under the extended 10-year warranty programme if the vehicle has followed the maintenance schedule.

LSPI is a phenomenon affecting small turbocharged direct injection engines including the PureTech. Fuel droplets ignite prematurely in the combustion chamber, creating extreme pressure spikes. Symptoms include hesitation, low-speed knock, and sudden loss of power around 2,000 rpm under gentle acceleration. PSA issued a technical service bulletin recommending oil and filter replacement as a first step, followed by turbo and engine part replacements in severe cases. Using the correct oil specification (0W-30 or 5W-30 as specified) and higher-octane fuel reduces risk. Minor LSPI damage may only require injector or spark plug replacement (€500-800), while severe piston damage leads to engine rebuild (€3,000-5,000). More common on cars driven predominantly in city traffic at low rpm.

Turbo failure on the 1.2 PureTech is typically a secondary consequence of the timing belt degradation or oil consumption issues rather than a standalone problem. When belt fragments clog the oil pickup, the turbocharger is among the first components to suffer from reduced lubrication. Symptoms include blue or black smoke from the exhaust, a whistling noise from the engine bay, and significant power loss. Turbo replacement costs €1,200-2,500 depending on whether new or remanufactured parts are used. If the turbo has failed, it is essential to also inspect the oil system for belt debris contamination before fitting a replacement, as the new turbo will fail quickly if the root cause is not addressed.

The original high pressure fuel pump fitted to earlier 1.2 PureTech engines can fail, causing engine fault warnings and limp mode. The diagnostic code is typically P0087 (fuel rail pressure too low). PSA released an updated pump with part number 9819061280 to address the issue. Replacement at an independent specialist costs €500-700, while dealer pricing runs €800-1,200 including diagnosis. This issue is more common on 2014-2017 production cars and is often resolved during routine servicing if the dealer is aware of the TSB.

As a direct injection engine, fuel is sprayed directly into the cylinders rather than over the intake valves. Without this fuel wash effect, carbon deposits accumulate on the back of the intake valves over time. This restricts airflow and causes rough idling, misfires, and power loss. Forum reports indicate some cars need valve cleaning as early as 45,000-55,000 km, though most affected cars show symptoms between 60,000-100,000 km. Walnut blasting or chemical cleaning of the intake valves costs €400-800 at a specialist. Regular motorway driving at higher rpm helps slow the buildup, while predominantly urban driving accelerates it.

The 308 T9 i-Cockpit system is known for touchscreen glitches. Common symptoms include the screen going blank and restarting every 5-10 minutes, unresponsive touch inputs, and temperature-related failures where the screen works in winter but fails in summer heat. A dashboard reset via Vehicle > Driver Assistance > Reset Display sometimes provides temporary relief. Software updates from the dealer have resolved the issue for some owners. In persistent cases, the head unit needs replacing at €500-800. Third-party refurbished units are available for around €300-400.