The 2023 718 Boxster S with the 2.5L turbo flat-four is still very new, but shares its 982-generation platform with models back to 2017. Early-build turbo four issues from 2017-2019 models (bore scoring, cylinder liner failures) have largely been addressed, but the engine remains the weak point when things go wrong — catastrophically expensive when they do.
Cylinder Bore Scoring / Liner Failure
Rare · high severityTypical onset: 40,000-80,000 mi
Symptoms: Excessive oil consumption (more than 1 qt per 1,000 mi), Cold-start smoke from exhaust, Metallic rattling or knocking at idle, Loss of compression in one or more cylinders
Fix: Complete engine rebuild or replacement. Cylinders require re-sleeving or new short block. 25-35 hours labor depending on approach. Earlier 2017-2019 engines saw this more; 2023s have improved coatings but not immune if improperly broken in or oil-starved.
Estimated cost: $15,000-28,000
Dual-Clutch Transmission (PDK) Mechatronic Unit Failure
Occasional · high severityTypical onset: 60,000-100,000 mi
Symptoms: Harsh or delayed shifts, especially 2-3 or 6-7, Transmission fault warning on dash, Jerking or shuddering during low-speed acceleration, Stuck in one gear, limp mode
Fix: Mechatronic unit replacement or rebuild. Unit is external on PDK, accessible without full trans drop. 8-12 hours labor. Oil cooler lines often leak at this mileage too; replace simultaneously.
Estimated cost: $4,500-7,500
Transmission Mount Failure
Common · medium severityTypical onset: 50,000-80,000 mi
Symptoms: Clunking during hard acceleration or deceleration, Vibration through shifter or center console, Excessive driveline movement felt through seat
Fix: Replace transmission mount. Mid-engine layout requires lifting rear subframe for access. 3-4 hours labor. Inspect engine mounts simultaneously — they wear at similar intervals.
Estimated cost: $800-1,400
Fuel Filter Clogging (Turbo Models)
Occasional · medium severityTypical onset: 60,000-90,000 mi
Symptoms: Hesitation or stumble under hard acceleration, Limp mode or reduced power warning, Rough idle after hot restarts, Fuel pressure faults logged in ECU
Fix: Replace in-tank fuel pump and filter assembly. Requires dropping fuel tank. 4-5 hours labor. Porsche officially calls this 'lifetime' but real-world turbo cars need service by 70k.
Estimated cost: $1,200-1,800
Intermediate Shaft (IMS) Bearing — NOT Applicable
Rare · low severitySymptoms: This is a common concern for older 996/997 owners, but the 718's turbocharged flat-four does NOT have an IMS bearing, No intermediate shaft between crankshaft and camshafts in this engine architecture
Fix: N/A — included here only to dispel myths. If someone quotes you IMS bearing service on a 718, walk away from that shop.
Coolant Expansion Tank Cracking
Occasional · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Coolant smell in cabin or engine bay, Visible coolant seepage at tank seams, Low coolant warning light, Overheating under sustained load
Fix: Replace expansion tank and pressure-test system. 2-3 hours labor. Plastic tanks fatigue from heat cycles. Check hoses and radiator end-tanks while system is drained.
Estimated cost: $600-1,000
Buy a 2023 if you want the latest engine revisions and remaining factory warranty; skip early 2017-2018 turbo-four cars unless full engine history is documented and oil consumption is verified normal.
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.