The 982-generation 718 Cayman S with the 2.5L turbo flat-four is mechanically solid for most owners, but a small percentage face catastrophic engine failures due to cylinder scoring and bearing issues—costly enough to total an otherwise great car.
Symptoms: Sudden oil pressure loss warning, Metallic knocking or rattling from engine bay, White/blue smoke from exhaust on cold start, Excessive oil consumption (more than 1 qt per 1,000 mi)
Fix: Complete engine rebuild or short block replacement. Requires engine removal, crankshaft inspection, bore scoring repair or new block, new pistons/rings, bearings, and reassembly. 30-40 labor hours for full rebuild; 20-25 hours for short block swap if available.
Estimated cost: $18,000-28,000
Transmission Oil Cooler Leaks
Occasional · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Transmission fluid pooling under car after parking, Low transmission fluid warning on dash, Burnt smell near rear of car, Harsh or delayed shifts if fluid level drops significantly
Fix: Replace transmission oil cooler and lines. Requires rear subframe access, cooler removal, new seals, and fluid refill with Porsche-spec ATF. 4-6 labor hours.
Estimated cost: $1,200-2,000
Transmission Mount Failure
Common · low severity
Typical onset: 40,000-80,000 mi
Symptoms: Clunking or thudding when shifting or accelerating hard, Excessive drivetrain movement felt through chassis, Vibration at idle in gear, Visible rubber separation or cracks on mount inspection
Fix: Replace rear transmission mount. Requires lifting car, supporting transmission, removing old mount, and installing OEM or upgraded aftermarket unit. 2-3 labor hours.
Estimated cost: $600-1,000
Fuel Filter Clogging (Early Models)
Occasional · medium severity
Symptoms: Intermittent misfires or rough running under load, Hesitation or stumbling during acceleration, Check engine light with lean fuel trim codes, Hard starting after sitting overnight
Fix: Replace in-tank fuel filter and pump assembly. Requires fuel tank drop or access through rear trunk area depending on approach. 3-4 labor hours. More common on 2017-2019 models but can affect early 2020s.
Estimated cost: $800-1,400
Head Gasket Seepage (Non-Catastrophic)
Rare · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Small oil weepage visible on cylinder head seams, Slight oil smell from engine bay after heat cycles, Minor coolant loss over time (not rapid), No mixing of oil and coolant in most cases
Fix: Replace head gaskets on affected bank or both. Engine removal recommended for proper access on flat-four. New gaskets, ARP studs optional for longevity, retorque procedure. 18-24 labor hours for both banks.
Estimated cost: $5,500-8,500
Owner tips
Check oil level religiously every 500-750 miles; turbo flat-fours consume oil by design, but sudden increases signal trouble
Use Porsche-approved 0W-40 synthetic only; off-brand or wrong viscosity accelerates bearing wear
Get a pre-purchase compression and leakdown test; cylinder scoring often shows minimal symptoms until catastrophic failure
Budget $2,000/year for maintenance beyond consumables—these are still $70k sports cars with German parts pricing
Avoid extended idle times and short trips; turbo engines need full operating temp to prevent carbon buildup and oil dilution
Buy it if you can stomach the 5-10% engine-failure lottery or have $25k in reserve; otherwise, the 981 Cayman S with the 3.4L NA flat-six is the safer used buy.
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.
Fitment notes: Battery located in front trunk (frunk); AGM required for start-stop system
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Every control module on the 2018-2023 Porsche 718 Cayman S — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Transmission Control Unit (TCU)2.5 hr R&Rsecurity gateway +0.8 hr▸ programming details
📍 Transmission housing, driver side
🔧 PIWIS III + PPN online
⚠️ PDK transmission; requires adaptation and clutch learning procedure
Power Steering Control Unit (EPS)2.0 hr R&Rsecurity gateway +0.5 hr▸ programming details
📍 Steering column, below dashboard
🔧 PIWIS III + PPN online
⚠️ Electric power steering; steering angle sensor calibration mandatory
Gateway Control Unit (Gateway)2.0 hr R&Rsecurity gateway +1.5 hr▸ programming details
📍 Behind dashboard, center above footwell
🔧 PIWIS III + PPN online
⚠️ Security gateway; replacement requires online authentication and all module re-coding
⚠️ Battery registration required after replacement; monitors battery health
Park Assist Control Unit (ParkAssist)0.8 hr R&Rdealer / factory tool +0.3 hr▸ programming details
📍 Rear trunk area, left side
🔧 PIWIS III
⚠️ Sensor calibration required after replacement
Seat Memory Control Unit (Seat Module)0.8 hr R&Raftermarket tool +0.2 hr▸ programming details
📍 Under driver seat
🔧 Autel MaxiSys / PIWIS
⚠️ Optional equipment; memory positions lost on replacement
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2020 Porsche 718 Cayman S 2.5L Turbo H4 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.