The 2020 Peugeot 108 shares its platform with the Toyota Aygo and Citroën C1, using proven Toyota-derived engines. While generally reliable for a city car, the 1.0L VTi and 1.2L PureTech suffer from timing chain and valvetrain wear issues when service intervals are stretched, and the automated manual transmission (when equipped) has a short-lived oil cooler.
Premature Timing Chain Stretch (1.0L VTi)
Common · high severityTypical onset: 60,000-90,000 mi
Symptoms: Rattling noise on cold start that fades after 10-15 seconds, Check engine light with cam/crank correlation codes, Rough idle and hesitation during acceleration, Metallic whirring from timing cover area
Fix: Timing chain kit replacement requires front engine disassembly including cover, tensioner, guides, and both sprockets. Often discover worn cam lobes during this job. 6-8 labor hours depending on additional damage assessment.
Estimated cost: $1,200-2,100
Hydraulic Lifter Collapse and Camshaft Wear
Common · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Persistent ticking/tapping from valve cover especially when warm, Loss of power and fuel economy degradation, Cylinder misfires on specific cylinders, Metal debris in oil during changes
Fix: Requires cylinder head removal to replace all lifters and inspect cam lobes. If cam lobes show scoring, full camshaft replacement adds 2-3 hours. Complete job is 8-12 hours including head removal, lifter replacement, valve adjustment, and reassembly with new head gasket.
Estimated cost: $1,800-3,500
Automated Manual Transmission Oil Cooler Failure
Occasional · high severityTypical onset: 50,000-80,000 mi
Symptoms: Transmission fluid mixing with coolant (milky reservoir), Hard shifting or refusal to engage gears, Transmission overheat warning on dash, Coolant loss without visible external leaks
Fix: The internal oil cooler develops pinhole leaks allowing cross-contamination. Requires cooler replacement, complete transmission fluid flush (multiple cycles), and coolant system flush. If contamination was severe, actuator and clutch pack replacement may be needed. 4-6 hours for cooler alone, 10-14 hours if internal transmission damage occurred.
Estimated cost: $900-3,200
Head Gasket Failure (1.2L PureTech)
Occasional · high severityTypical onset: 80,000-120,000 mi
Symptoms: White smoke from exhaust especially during warm-up, Coolant consumption without external leaks, Rough running and cylinder misfires, Bubbling in coolant reservoir when running, Oil appears milky or frothy on dipstick
Fix: Three-cylinder head gasket jobs are tedious due to tight engine bay. Requires head removal, surface inspection/machining, and replacement of gasket, head bolts, and typically timing components while apart. 9-11 labor hours if head doesn't need machine work, add 2-3 days if machine shop needed.
Estimated cost: $1,600-2,800
Harmonic Balancer Deterioration
Occasional · medium severityTypical onset: 80,000-100,000 mi
Symptoms: Vibration felt through steering wheel at idle, Squealing or chirping from front of engine, Visible wobble of crankshaft pulley when running, Serpentine belt wear or throwing
Fix: The rubber damper ring separates from the hub causing imbalance. Replacement requires serpentine belt removal and special puller/installer tools. Simple job at 2-3 hours but critical to prevent crankshaft damage if the balancer disintegrates.
Estimated cost: $350-650
Transmission Mount Collapse
Common · low severityTypical onset: 60,000-90,000 mi
Symptoms: Clunking when shifting from reverse to drive, Excessive engine movement visible when revving, Vibration through shifter and floor during acceleration, Drivetrain noise especially on uneven roads
Fix: The upper transmission mount rubber deteriorates from heat and oil exposure. Replacement requires supporting the transmission and unbolting the mount. Straightforward job at 1.5-2.5 hours but often done alongside other work due to access requirements.
Estimated cost: $250-450
Buy only with complete service records showing 5k oil changes and no deferred timing chain or valve noise—clean examples under 60k miles are decent city cars, but higher-mileage examples become money pits fast.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.