2017 PEUGEOT 308

Typical onset: 60,000-100,000 mi

Symptoms: Harsh shifts or delayed engagement, especially 2nd to 3rd gear, Transmission slipping under acceleration, Metallic debris in fluid during service, Mechatronic unit fault codes (P17xx series)

Fix: The AL4/EAT6 mechatronic sleeve wears prematurely, contaminating fluid and damaging clutch packs. Early intervention with fluid changes can extend life, but most need valve body replacement (8-12 hours) or full rebuild (18-24 hours). OE parts are expensive and availability is poor in North America.

Estimated cost: $3,500-7,500

Typical onset: 80,000-120,000 mi

Symptoms: Rattling on cold start for first 2-3 seconds, Check engine light with cam/crank correlation codes, Loss of power and rough running if chain jumps timing, Metallic noise from front of engine at idle

Fix: The EP6 timing chain and hydraulic tensioner wear prematurely with extended oil change intervals. Requires timing kit, VVT solenoids, and often upper chain guides (12-16 hours labor). Engine-out access recommended for thorough job. If chain jumps, valve damage is likely requiring head work.

Estimated cost: $2,800-4,500

Typical onset: 50,000-80,000 mi

Symptoms: Rough idle and hesitation on acceleration, Reduced fuel economy (3-5 mpg drop), Misfires on cold starts, Loss of power above 4,000 rpm

Fix: Direct-injection engines with no port injection suffer heavy carbon deposits. Walnut blasting through intake manifold (6-8 hours) is the proper fix. Intake manifold removal required, gaskets needed. Chemical cleaning sprays provide temporary relief only.

Estimated cost: $600-1,200

Symptoms: One or both headlights completely out, Flickering or dimming LED modules, Dashboard warning for headlight malfunction, Moisture visible inside housing after rain

Fix: LED driver boards fail due to heat and moisture intrusion. Peugeot's sealed headlight design requires full assembly replacement as individual LED modules aren't sold separately (2-3 hours per side). Aftermarket options are poor quality. OE assemblies are $800-1,200 each before labor.

Estimated cost: $1,000-1,800

Typical onset: 70,000-110,000 mi

Symptoms: Transmission fluid spots under vehicle, Low transmission fluid warning, Overheating transmission under load, Pink or red fluid visible near radiator area

Fix: Rubber cooler lines and crimped fittings deteriorate, especially in hot climates. Lines run along subframe and are vulnerable to road debris. Requires cooler line replacement and sometimes the cooler itself if contaminated (4-6 hours). Must flush system and refill with expensive Peugeot-spec ATF.

Estimated cost: $800-1,400

Symptoms: Random electrical faults and warning lights, No-start condition after rain or car wash, Corroded fuses and terminals visible on inspection, Multiple systems failing simultaneously

Fix: Fuse box seal deteriorates allowing water into engine bay BSI unit. Corrosion causes intermittent faults that are difficult to diagnose (2-4 hours diagnostic time). Replacement fuse box requires coding to VIN (3-4 hours total). Prevention: check drain tubes and seal condition annually.

Estimated cost: $800-1,600

Typical onset: 60,000-90,000 mi

Symptoms: Clunking when shifting from Park to Drive, Excessive vibration at idle in gear, Visible engine movement when revving in Park, Drivetrain lurch during acceleration

Fix: Hydraulic transmission mount deteriorates faster than rubber engine mounts due to ATF heat transfer. Front mount sees most stress. Replacement is straightforward (2-3 hours) but requires proper support of drivetrain. OE parts strongly recommended as aftermarket mounts fail quickly.

Estimated cost: $400-700