2019 PEUGEOT 508

Typical onset: 40,000-80,000 mi

Symptoms: Metallic rattling on cold start, Oil contamination with belt material, Check engine light with timing correlation codes, Catastrophic engine failure if belt disintegrates

Fix: The oil-bathed timing belt degrades prematurely, shedding material into the oil system. Requires timing belt replacement, oil system flush, and often oil pump replacement. 8-12 hours labor. If it fails completely, you're looking at engine rebuild or replacement due to valve-piston contact.

Estimated cost: $1,800-3,500 (preventive), $8,000-12,000 (after failure)

Typical onset: 50,000-90,000 mi

Symptoms: Loss of power in limp mode, Excessive DPF regeneration cycles, Fuel dilution in oil, Warning lights for anti-pollution system, Poor fuel economy

Fix: Short-trip driving prevents proper DPF regeneration. Often requires forced regeneration initially (1-2 hours), but repeated clogging leads to DPF replacement. Many need injector cleaning or replacement simultaneously due to carbon buildup. DPF replacement is 4-6 hours.

Estimated cost: $500-1,200 (cleaning/regen), $2,500-4,000 (DPF replacement)

Typical onset: 60,000-100,000 mi

Symptoms: Transmission fluid leaking from cooler lines, Harsh shifting when cold, Burnt transmission fluid smell, Low fluid warnings on models with sensors

Fix: The external oil cooler and its lines develop leaks at fittings and seals. Requires cooler replacement and often line replacement. Transmission fluid contamination can damage clutch packs if driven low on fluid. 3-5 hours including flush and refill.

Estimated cost: $800-1,500

Typical onset: 70,000-110,000 mi

Symptoms: Check engine light with P2015/P2017 codes, Rough idle and hesitation, Loss of low-end torque, Audible clicking from intake manifold

Fix: Variable intake manifold flap motors and linkages break or seize due to carbon buildup. Requires intake manifold removal, actuator replacement, and carbon cleaning. Some techs replace the entire manifold assembly to avoid repeat failures. 4-6 hours labor.

Estimated cost: $600-1,200 (actuator), $1,200-2,000 (full manifold)

Typical onset: 80,000-120,000 mi

Symptoms: Coolant loss with no visible external leaks, White smoke on startup, Pressurized coolant reservoir, Oil contamination in coolant expansion tank

Fix: The 1.5 BlueHDi develops head gasket leaks, often into combustion chambers or between cylinders. Requires head removal, resurfacing, and gasket replacement. If caught early, head resurface is sufficient. Delay can warp the head beyond spec. 10-14 hours labor including timing belt replacement while in there.

Estimated cost: $2,800-4,500

Typical onset: 100,000+ mi

Symptoms: Reduced electric-only range (below 15 miles), Frequent engine starts in EV mode, Battery warning lights, Charging system faults

Fix: High-voltage battery packs degrade over time and charge cycles. PSA offers 8-year/100,000-mile warranty on battery, but post-warranty failures are expensive. Battery module replacement is dealer-only work, 6-8 hours. Individual cell replacement not typically offered.

Estimated cost: $8,000-15,000 (out of warranty)