Peugeot 307 2.0 HDi

The 307 2.0 HDi (110 hp and 136 hp versions) uses a FAP particulate filter that requires Eolys cerium-based additive to assist regeneration. The additive tank needs refilling roughly every 80,000-120,000 km, and the refill alone costs around €250-350 at a Peugeot dealer. If the Eolys tank pump fails, the sealed tank assembly typically needs replacing (€300-400 for the part). When the FAP itself is blocked beyond cleaning, replacement costs €600-1,200 for the filter plus fitting. Cars driven predominantly on short urban trips are especially vulnerable because the FAP never reaches the temperature needed for passive regeneration. The 90 hp version (DW10TD) was available without FAP, making it significantly cheaper to maintain in this regard.

The 110 hp and 136 hp versions use a dual mass flywheel that absorbs drivetrain vibrations. Forum reports suggest replacement is commonly needed between 120,000-180,000 km, and taxi drivers regard it as routine. Symptoms include a rattling noise at idle, vibration through the clutch pedal, and difficulty engaging gears. The DMF and clutch should be replaced together. Total cost at an independent garage is typically €700-1,000 for parts and labor, rising to €1,200-1,400 at a Peugeot dealer. A solid flywheel conversion kit is available for around €400 but alters the drivetrain feel. The 90 hp version does not use a DMF.

The Garrett turbocharger on the DW10 can fail if the oil feed line becomes restricted by sludge or carbon particles. This is almost always caused by extended oil change intervals or using incorrect oil. Symptoms include blue/grey exhaust smoke, oil consumption, whistling noises, and eventually loss of power. A reconditioned turbo costs around €400-600, a new Garrett unit €500-700, with labor adding €300-500. When replacing the turbo, it is essential to also replace the oil feed line and banjo bolt strainer, and to flush the oil system. Turbo lifespan on well-maintained cars is typically 150,000-200,000+ km. The DW10 engine has a known design issue where not all oil drains from the sump during changes, leaving behind contamination that eventually reaches the turbo.

The Peugeot 307 uses a multiplexed electrical system controlled by the BSI module. When this unit fails, symptoms can include: failure to start, windows and wipers not working, central locking faults, dashboard warning lights illuminating randomly, and the BSI failing to power down (draining the battery overnight). BSI repair by a specialist costs around €150-250, while full replacement with programming runs €300-600 because the new unit must be coded to the vehicle. Pre-2005 cars are more commonly affected. A BSI reboot (disconnecting the battery for 15 minutes, then reconnecting) can sometimes resolve temporary glitches.

The exhaust gas recirculation valve on the DW10 engine gradually accumulates carbon deposits, especially on cars that do a lot of short-trip driving. Symptoms include rough idle, hesitation under light throttle, and the anti-pollution fault message on the dashboard. On the 2.0 HDi, the EGR valve is awkwardly located behind the air intake, requiring removal of the wiper mechanism for access on some versions. Cleaning the valve with EGR spray can resolve the issue temporarily (cost: €20-40 DIY), but replacement is €200-400 for the part plus €100-150 labor. A new Valeo unit is recommended over cheap aftermarket options.

Front suspension noise is widely described as the 307's weak point. Anti-roll bar D-bushes wear out rapidly, sometimes within 2 years, causing a persistent knocking sound over bumps. Drop links, ball joints, and lower wishbone bushes also wear at relatively high rates. Many owners end up replacing anti-roll bar bushes, drop links, and wishbones as a complete set. Parts are inexpensive (€50-100 per side for wishbones, €10-20 for bushes), but the work adds up. A full front suspension refresh with bushes, drop links, ball joints, and wishbones typically costs €300-600 at an independent garage.

The 307's electric window mechanism uses steel cables wound on a plastic reel attached to the motor. These cables can tangle and break, requiring a full regulator replacement (€80-150 per window including labor). Central locking actuators can also fail from around 60,000 km, leaving individual doors unable to lock or unlock electrically. The driver's door lock is the most commonly affected. Replacement actuators cost €40-80, and the repair is relatively straightforward. Pre-facelift cars (2001-2005) are more frequently affected.