The 2018 Peugeot 108 shares its platform with the Toyota Aygo and Citroën C1, using proven Toyota-derived 1.0L and 1.2L three-cylinder engines. While generally reliable for a city car, the PureTech 1.2L has notable timing chain and oil consumption issues that plague early examples, while both engines can suffer from hydraulic lifter noise and premature wear.
Timing Chain Premature Stretch (1.2L PureTech)
Common · high severityTypical onset: 40,000-80,000 mi
Symptoms: Rattling noise on cold start that fades after 10-15 seconds, Check engine light with cam/crank correlation codes (P0016, P0017), Rough idle and loss of power, Metallic grinding from timing cover area in severe cases
Fix: Requires timing chain, tensioner, guides, and often VVT solenoids. Many techs replace oil pump and harmonic balancer simultaneously due to access. 8-12 hours labor depending on additional damage. Engine-out procedure on some variants adds 4 hours.
Estimated cost: $2,200-4,500
Hydraulic Valve Lifter Collapse/Noise
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Persistent ticking/tapping from valve cover, louder when cold, Noise doesn't disappear after warm-up (distinguishes from normal lifter tick), Occasional misfire codes on affected cylinder, Fuel economy drops 2-3 mpg in some cases
Fix: Individual lifter replacement possible but most shops replace all 12 lifters at once to prevent comebacks. Requires camshaft removal. 6-8 hours labor. Use OE or high-quality aftermarket only—cheap lifters fail within 10,000 miles.
Estimated cost: $1,200-2,000
Excessive Oil Consumption (1.2L PureTech)
Occasional · high severityTypical onset: 50,000-90,000 mi
Symptoms: Oil level drops 1 quart per 1,000-1,500 miles, Blue smoke on deceleration or startup, Fouled spark plugs (oil-soaked threads), No external leaks visible
Fix: Caused by piston ring design and bore glazing. Proper fix requires engine rebuild with updated piston rings and cylinder honing. Some owners limp along adding oil, but fouled cats and turbo damage (if applicable) follow. Rebuild: 16-20 hours.
Estimated cost: $3,500-5,500
Transmission Mount Failure
Common · low severityTypical onset: 70,000-110,000 mi
Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive vibration at idle, especially with A/C on, Visible engine movement when revving in Park, Transmission tunnel vibration felt through shifter
Fix: The upper transmission mount (dog-bone mount) tears due to small engine bay and engine rocking. Simple replacement: 1.5-2 hours. Often replaced alongside engine mount for comprehensive fix.
Estimated cost: $250-450
Head Gasket Failure (1.0L VTi)
Occasional · high severityTypical onset: 80,000-130,000 mi
Symptoms: Coolant loss with no visible external leaks, White smoke from exhaust on cold start, Overheating in traffic or hard acceleration, Milky residue on oil cap or dipstick in severe cases
Fix: The 1.0L three-cylinder runs hot in city traffic. Head gasket replacement requires cylinder head removal, machining check, and often new head bolts. 10-12 hours labor. Always pressure-test cooling system and check head for warping (add $400-600 if machining needed).
Estimated cost: $1,800-2,800
Harmonic Balancer Deterioration
Occasional · medium severityTypical onset: 90,000-130,000 mi
Symptoms: Vibration at specific RPM ranges (typically 2,000-2,500 RPM), Squealing from front of engine, Visible wobble of crankshaft pulley, Accessory belt wear accelerated or belt throwing off
Fix: Rubber isolation ring separates on the harmonic balancer. Replacement requires special pulley holder tools. 2-3 hours labor. Always inspect when doing timing chain work since access is identical.
Estimated cost: $400-700
Buy the 1.0L VTi if you're targeting this platform—simpler, more durable despite lower power. Avoid early 1.2L PureTech unless timing chain and lifters have documented recent replacement. Budget $1,500-2,000 for deferred maintenance on any 60,000+ mile example.
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.