2025 PEUGEOT 508

Typical onset: 60,000-100,000 mi

Symptoms: metallic rattling at cold start, oil contamination with rubber particles, check engine light with cam/crank correlation codes, sudden loss of power or no-start

Fix: Wet timing belt disintegrates in oil, sending debris through engine. Requires full engine teardown, oil system flush, new belt kit, often cam phasers and oil pump. 18-24 hours labor if caught early; full engine rebuild (40-60 hours) if debris damages bearings or cylinder head.

Estimated cost: $3,500-8,000 early catch, $8,000-14,000 full rebuild

Typical onset: 70,000-120,000 mi

Symptoms: persistent ticking or tapping from valve train, rougher idle quality, gradual loss of power, increased oil consumption

Fix: PureTech and BlueHDi engines prone to lifter collapse, especially with extended oil change intervals. Requires cylinder head removal, all lifters replaced, often camshaft inspection/replacement if wear pattern present. 12-16 hours labor.

Estimated cost: $2,800-4,500

Symptoms: reduced electric range below 15 miles, battery overheat warnings, forced engine running even when battery shows charge, HVAC system malfunctions

Fix: Cooling pump or thermal control valve fails in hybrid battery pack. Requires underbody access, coolant system evacuation, module replacement. Can cause premature battery degradation if ignored. 6-9 hours labor, parts availability can be 4-6 weeks.

Estimated cost: $2,200-3,800

Typical onset: 40,000-80,000 mi

Symptoms: clunking on acceleration or deceleration, excessive vibration at idle in Drive, visible transmission sag on lift, difficulty shifting into Park

Fix: OEM transmission mounts fail prematurely, especially with stop-start systems. Torque mount and upper mount both suspect. Requires subframe support, 3-4 hours labor for both mounts. Use upgraded aftermarket mounts when available.

Estimated cost: $600-1,100

Typical onset: 80,000-140,000 mi

Symptoms: white smoke from exhaust, coolant loss with no visible leaks, oil contamination in coolant reservoir, overheating under load

Fix: Aluminum head on iron block with inadequate torque spec leads to gasket failure. Requires head removal, resurfacing (often warped .008-.015 inches), ARP stud upgrade recommended. 14-18 hours labor including head work.

Estimated cost: $3,200-5,000

Typical onset: 90,000-130,000 mi

Symptoms: visible wobble on balancer pulley, serpentine belt walking off, rough vibration at specific RPM ranges (1,800-2,200), accessory drive noise

Fix: Rubber isolator separates between hub and outer ring. Requires removal of front accessories, sometimes motor mount support. 3-5 hours labor depending on access (PHEV has tighter packaging).

Estimated cost: $700-1,300

Typical onset: 50,000-90,000 mi

Symptoms: limp mode activation, excessive regen cycles (5-6 per tank), strong diesel smell during regen, fuel economy drop of 15-20%, amber exhaust filter warning light

Fix: Short-trip driving prevents full regen cycles. Requires DPF removal, professional cleaning or replacement. Cleaning: 4-6 hours labor. Replacement: 5-7 hours. Always address root cause (EGR, injectors, oil contamination) or it repeats.

Estimated cost: $1,200-2,000 cleaning, $2,800-4,200 replacement