Peugeot 308 1.6 HDi T7

This is the most well-known failure on the DV6 engine and it follows a predictable chain: the copper injector sealing washers degrade over time, allowing exhaust gases to blow past and create carbon deposits around the injector sleeves. This carbon enters the engine oil and gradually blocks the fine gauze filter in the turbo oil feed banjo bolt (located behind the exhaust manifold). Oil pressure to the turbo drops below the required 2.3 bar minimum, causing bearing failure. Symptoms include blue or black smoke, whistling sounds, and significant power loss. A replacement turbo fitted at an independent specialist costs around 1,200-1,500 euro, including the mandatory fitting kit (strainer, oil feed pipe, seals). At a Peugeot dealer, costs reach 2,000-2,500 euro. Prevention includes replacing injector seals and copper washers proactively every 60,000-80,000 km, using the correct low-SAPS oil (PSA B71 2312), and keeping oil change intervals short (every 10,000 km rather than the standard 20,000 km). BTN Turbo reports that even well-maintained examples can suffer repeat failures, with documented cases of two turbo replacements within 180,000 km.

The T7 308 1.6 HDi uses an additive-assisted DPF (Eolys cerine system) that lowers the regeneration temperature compared to non-additive DPFs. Despite this, short trips under 15 minutes prevent the filter from reaching regeneration temperature. Symptoms include the anti-pollution warning, engine warning light, reduced power, and in severe cases the car refusing to start. A professional forced regeneration costs around 150-250 euro. DPF chemical cleaning costs 300-500 euro. Full DPF replacement costs 800-1,500 euro depending on whether aftermarket or OEM parts are used. The Eolys additive tank also needs topping up approximately every 120,000 km at a cost of around 150 euro at a dealer. Using the correct low-SAPS oil is essential - regular oil leaves ash deposits that permanently block the DPF.

The EGR valve on the DV6 engine accumulates carbon deposits over time, especially with gentle driving and short trips. When it sticks, symptoms include rough idling, loss of power, the anti-pollution warning message, and fault codes P0490 or P1162. Cleaning the EGR valve costs around 150-250 euro at an independent garage and is often sufficient to restore normal operation. If the valve is damaged beyond cleaning, replacement costs 350-800 euro depending on whether aftermarket parts (around 100-150 euro for the valve) or OEM parts (around 300 euro) are used. The EGR is located at the rear of the engine block, making access awkward and adding to labor time.

The crankshaft pulley on the DV6 engine uses a rubber isolator ring to absorb torsional vibrations. Over time, this rubber degrades and separates, causing a loud metallic tapping noise and increased engine vibration. If left unrepaired, it can stress the timing belt and auxiliary belt, potentially leading to more serious damage. The part itself costs 80-150 euro, but labor adds 150-350 euro due to the need to support the engine and remove auxiliary components. This issue typically appears after 80,000-120,000 km and is well-known among PSA HDi owners.

The 1.6 HDi is known for thermostat failures that cause the engine to run below optimal temperature, resulting in poor cabin heating, increased fuel consumption, and sluggish performance. On the DV6 engine, the thermostat is difficult to access, with labor times of 3-6 hours depending on the workshop's experience with the model. Parts cost around 50-100 euro, but total repair costs reach 200-500 euro due to labor. In some cases, the heater matrix itself becomes blocked with sediment, requiring flushing (100-200 euro) or replacement (400-600 euro including labor). This issue typically appears between 70,000-120,000 km.

The dual mass flywheel on the 1.6 HDi can develop excessive play, causing juddering when moving off in first gear and a rattling noise at idle that disappears when the clutch pedal is pressed. The DMF should always be replaced together with the clutch as labor costs for gearbox removal are the major expense (book time is approximately 7-9 hours on the 308). A complete clutch and DMF kit costs 300-500 euro in parts. Total cost at an independent specialist is 800-1,200 euro, while a Peugeot dealer quotes 1,200-1,600 euro. Solid flywheel conversion kits exist as a cheaper long-term alternative but increase drivetrain vibration.

The T7 308 is known for ESP and ABS sensor faults, typically appearing between 70,000-110,000 km. Symptoms include the ESP and ABS warning lights illuminating on the dashboard, sometimes accompanied by traction control deactivation. The most common cause is a failed or corroded wheel speed sensor, which costs 30-80 euro per sensor. However, diagnosis can be tricky - Peugeot dealers charge around 100 euro just for diagnostic scanning. Total repair cost including diagnosis and sensor replacement is typically 150-400 euro. The sensors must be fitted with the connector facing the rear of the vehicle, and the BSI (body systems interface) must be reset after replacement.