The 2019 Daihatsu Thor is a compact Japanese minivan sharing the Toyota Roomy/Tank platform. While generally reliable for city duty, it suffers from CVT cooling issues and specific valvetrain problems on higher-mileage turbo variants.
CVT Transmission Oil Cooler Failure
Common · high severityTypical onset: 70,000-110,000 mi
Symptoms: CVT fluid overheating warning light, Burnt transmission fluid smell, Hesitation or shuddering during acceleration, Transmission enters limp mode in hot weather or under load
Fix: Replace CVT oil cooler and flush entire system. External cooler mounted near radiator corrodes internally or clogs with debris. Requires complete fluid exchange and often new cooler lines. 3-4 labor hours plus parts.
Estimated cost: $800-1,400
Lifter Tick and Premature Camshaft Wear (Turbo 1KR-VET)
Occasional · medium severityTypical onset: 80,000-130,000 mi
Symptoms: Loud ticking or tapping noise from valve cover, especially cold start, Gradual loss of power and fuel economy, Check engine light with cam position correlation codes, Metal shavings in oil during changes
Fix: Replace all hydraulic lifters and inspect camshaft lobes for scoring. Turbo engine runs hotter oil temps and inadequate oil change intervals accelerate wear. Often requires camshaft replacement if caught late. Cylinder head removal recommended for proper inspection. 8-12 labor hours.
Estimated cost: $1,800-3,200
Timing Chain Stretch (High-Mileage Units)
Occasional · high severityTypical onset: 120,000-160,000 mi
Symptoms: Rattling noise from front of engine at startup that fades after 5-10 seconds, Check engine light with cam/crank correlation codes (P0016, P0017), Rough idle or hesitation, In severe cases, won't start or runs extremely rough
Fix: Replace timing chain, tensioner, guides, and related seals. The 1KR engines use a chain but tensioner weakens over time. Requires front engine disassembly. Often discover oil pump wear during this job. 6-9 labor hours.
Estimated cost: $1,200-2,100
Head Gasket Failure (Turbo Models Under Stress)
Rare · high severityTypical onset: 90,000-140,000 mi
Symptoms: White smoke from exhaust, especially after warmup, Coolant loss with no visible leaks, Overheating under load or in traffic, Bubbles in coolant reservoir or combustion gases in coolant, Oil appears milky or coolant appears oily
Fix: Full head gasket replacement requires cylinder head removal, resurfacing, and pressure testing. Turbo engines running lower-octane fuel or towing experience more failures. Always replace head bolts (torque-to-yield). Check for warped head. 10-14 labor hours.
Estimated cost: $2,200-3,800
Transmission Mount Deterioration
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: Excessive vibration at idle, especially in Drive, Clunking when shifting from Park to Drive or Reverse, Visible engine/trans movement when revving in Park, Increased cabin noise on rough roads
Fix: Replace upper transmission mount and inspect adjacent engine mounts. Rubber degrades faster in hot climates. Straightforward job with proper support equipment. 1.5-2.5 labor hours.
Estimated cost: $250-450
Harmonic Balancer Deterioration
Occasional · medium severityTypical onset: 100,000-150,000 mi
Symptoms: Vibration felt through steering wheel at specific RPM ranges (usually 1,500-2,500), Visible wobble or separation of outer ring from hub, Squealing from serpentine belt area, Check engine light with crankshaft position sensor codes
Fix: Replace harmonic balancer/crankshaft pulley assembly. The rubber isolator separates or hardens with age and heat cycles. Requires specialized puller and installer tools. Inspect front main seal while accessible. 2-3 labor hours.
Estimated cost: $400-700
Solid urban commuter if naturally aspirated and CVT has documented frequent fluid changes; turbo models need detailed service records or budget for valvetrain work—pass on any with neglected maintenance.
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.