2022 PEUGEOT 508

Typical onset: 60,000-100,000 mi

Symptoms: Metallic rattling on cold start, Check engine light with cam/crank correlation codes, Oil contamination with belt debris, Sudden loss of power or no-start condition

Fix: The wet timing belt runs in engine oil and deteriorates prematurely, shedding material that clogs oil passages. Requires timing belt replacement with upgraded kit, oil system flush, and often cam phasers. 8-12 hours labor. If catastrophic failure occurs, expect full engine rebuild or replacement with cylinder head work.

Estimated cost: $2,800-6,500 for belt service, $8,000-14,000 for engine rebuild

Typical onset: 40,000-80,000 mi

Symptoms: Loud clunk when shifting from Park to Drive/Reverse, Vibration through cabin at idle, Excessive engine movement visible during acceleration, Transmission knocking over bumps

Fix: The hydraulic transmission mount fails early due to inadequate design for the 8-speed auto's torque characteristics. Requires OEM replacement mount and often both upper and lower mounts for proper fix. 2-3 hours labor including subframe drop.

Estimated cost: $600-1,200

Typical onset: 50,000-90,000 mi

Symptoms: Red ATF fluid puddles under vehicle, Transmission overheating warnings, Harsh shifts or delayed engagement when hot, Low transmission fluid level on dipstick (if equipped)

Fix: The external oil cooler develops leaks at crimped connections or internal clogging from debris. Replacement requires cooler unit, new lines, full fluid flush. If cooler was clogged long-term, valve body damage possible. 4-6 hours labor.

Estimated cost: $1,200-2,800

Typical onset: 70,000-110,000 mi

Symptoms: Limp mode with reduced power warning, Excessive black smoke on acceleration, DPF regeneration failures and warning light, Rough idle and poor fuel economy

Fix: Diesel models suffer from EGR valve carbon buildup and DPF clogging, especially with short-trip driving. Requires EGR cleaning or replacement, DPF cleaning or replacement, and intake manifold decarb. 6-10 hours labor for comprehensive fix.

Estimated cost: $1,800-4,500

Symptoms: Hybrid system error messages, Reduced electric-only range, Battery cooling fan running constantly, Vehicle stuck in gas-only mode, Battery temperature warnings

Fix: The plug-in hybrid's battery cooling system develops sensor failures, coolant leaks in the battery pack circuit, or control module issues. Diagnosis requires dealer-level scan tools. Fixes range from simple sensor replacement (2 hours) to battery pack coolant loop repairs requiring pack removal (12-16 hours).

Estimated cost: $800-6,500

Typical onset: 60,000-100,000 mi

Symptoms: Rough idle with fluctuating RPM, Check engine light with lean/rich mixture codes, Whistling or hissing noise from engine bay, Loss of low-end torque, Poor throttle response

Fix: Plastic intake manifolds develop vacuum leaks at gasket interfaces, and internal runner flaps bind or break off. Requires manifold removal, gasket replacement, and often entire manifold assembly if flaps are damaged. 4-6 hours labor.

Estimated cost: $900-1,800