The 991.2 Turbo with its 3.8L twin-turbo flat-six is generally robust, but when things go wrong they're catastrophic and expensive. The frequent appearance of complete engine rebuild jobs in repair records tells you this isn't a Camry—bore scoring and IMS issues are mostly behind us, but connecting rod bearing failures and piston/ring problems still lurk, especially in hard-driven or track-used examples.
Connecting Rod Bearing Failure (Catastrophic Engine Damage)
Occasional · high severity
Typical onset: 40,000-80,000 mi
Symptoms: Metallic knocking or rattling from engine bay, especially on cold start, Low oil pressure warning intermittent or persistent, Metal debris visible in oil filter during oil change, Sudden loss of power followed by engine seizure in worst cases
Fix: Complete engine teardown for inspection, replacement of all rod bearings at minimum, often requires crank polishing or replacement, new pistons, complete reseal. If caught early: 20-25 hours. If catastrophic: 35-50 hours for short block or complete rebuild. Some shops pull the engine, others work in-chassis.
Estimated cost: $15,000-35,000
Turbocharger Oil Feed Line Failure
Occasional · high severity
Typical onset: 60,000-100,000 mi
Symptoms: Blue smoke on startup or under boost, Sudden loss of boost pressure, limp mode activation, Oil consumption increases noticeably between changes, Oil pooling under vehicle after spirited driving
Fix: Replace oil feed and return lines to both turbos, typically requires removal of heat shields and sometimes exhaust components for access. 8-12 hours labor. Often done preventatively when turbos are serviced. If turbo was starved of oil, add turbo replacement cost.
Estimated cost: $2,500-4,500
Transmission Oil Cooler Leaks
Common · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Transmission fluid spots under vehicle, usually pink/red, Burnt transmission fluid smell after highway driving, Harsh or delayed shifts when transmission is cold, Low transmission fluid warning on instrument cluster
Fix: Replace transmission oil cooler lines and/or cooler assembly, sometimes requires front bumper removal for access. O-rings and seals fail from heat cycling. 4-6 hours labor for lines, 6-8 hours if cooler itself is leaking.
Estimated cost: $1,200-2,800
Transmission Mounts Deterioration
Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive driveline vibration at idle in gear, Notchy or imprecise gear engagement, Visible sagging or cracks in rubber mount visible from underneath
Fix: Replace transmission mounts (typically 2-3 mounts depending on PDK configuration). Requires transmission support and partial lowering. 3-5 hours labor. Often combined with engine mount inspection/replacement.
Estimated cost: $1,500-2,500
Fuel Filter Clogging (High-Pressure Pump Circuit)
Occasional · medium severity
Symptoms: Rough idle or misfires under full throttle, Loss of power above 4,000 RPM, Check engine light with fuel trim or misfire codes, Long crank times before engine fires
Fix: Replace in-tank fuel filter assembly and sometimes high-pressure fuel pump. Requires fuel tank drop or access panel removal depending on approach. 4-6 hours labor. More common in cars using lower-quality fuel or sitting extended periods.
Estimated cost: $1,200-2,200
Coolant Pipe Corrosion and Leaks
Occasional · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: Coolant smell in cabin or engine bay, White residue or crusty buildup on coolant pipes, Overheating warning especially after spirited driving, Visible coolant weeping from pipe junctions near cylinder heads
Fix: Replace corroded coolant pipes, typically at cylinder head connections. Requires partial engine disassembly, sometimes intake manifold removal for access. 6-10 hours labor depending on which pipes are affected. Use updated parts with improved corrosion resistance.
Estimated cost: $2,000-4,000
Owner tips
Do oil analysis every 5,000 miles to catch bearing wear early—bearing failures are preventable if you're watching metal content
Budget $3,000-5,000 annually for maintenance if you're past 50k miles; this platform rewards preventive care but punishes neglect
Inspect transmission oil cooler lines and engine mounts during every major service—catching these early saves thousands
Use TOP TIER fuel exclusively and replace fuel filter every 40k miles if you track the car or use it hard
Consider pre-purchase inspection with oil sample analysis and borescope cylinder inspection—catastrophic engine failure is the wallet killer here
Buy one with complete service records and budget for the expensive stuff, or walk away—when these break, they break big, but a well-maintained example is still one of the most capable sports cars ever built.
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; AGM required for electrical system demands
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Every control module on the 2013-2017 Porsche 911 Turbo — 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 +1.0 hr▸ programming details
⚠️ Monitors battery health and charging. Battery registration required after replacement.
Park Assist Control Unit (ParkAssist)0.8 hr R&Raftermarket tool +0.3 hr▸ programming details
📍 Rear luggage compartment, left side
🔧 PIWIS II/III or Autel
⚠️ Parking sensor system. Sensor calibration may be needed. Camera integration on equipped models.
Seat Memory Control Unit (Seat Module)0.8 hr R&Raftermarket tool +0.2 hr▸ programming details
📍 Under driver and passenger seats
🔧 PIWIS II/III or Durametric
⚠️ Controls power seat, memory, and heating/ventilation. Basic coding possible with aftermarket tools.
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.
AIR BAGS: AIR BAG/RESTRAINT CONTROL MODULE · 19V533000
2019-07-17
Porsche Cars North America, Inc. (Porsche) is recalling certain 2016-2017 911 and Boxster, 2016 Cayman and Panamera vehicles. The air bag Electronic Control Unit (ECU) may have a defective power supply capacitor that can result in air bag deactivation or inadvertent deployment of the air bags.
Consequence: Deactivated air bags increase the risk of injury. Inadvertent deployment of the air bags increase the risk of a crash.
Remedy: Porsche will notify owners, and dealers will install new software and replace the air bag ECU as necessary, free of charge. Interim notices informing owners of the safety risk were mailed September 13, 2019. Owners received a second notice and the recall began February 12, 2020. Owners may contact Porsche customer service at 1-800-767-7243. Porsche's number for this recall is AKB4.
VISIBILITY:WINDSHIELD · 17V135000
2017-03-02
Porsche Cars North America, Inc. (Porsche) is recalling certain 2017 911 Carrera Cabriolet, 911 Carrera 4 Cabriolet, 911 Carrera 4S Cabriolet, 911 Carrera S Cabriolet, 911 Targa S, 911 Targa 4S, 911 Turbo Cabriolet, 718 Boxter and 718 Boxter S vehicles. During manufacturing, the windshield may not have been properly bonded to the vehicle, allowing it to detach in a crash. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 212, "Windshield Mounting."
Consequence: In the event of a crash, if the windshield separates from the vehicle, it can increase the risk of injury.
Remedy: Porsche will notify owners, and dealers will rebond the windshield, free of charge. The recall began on May 12, 2016. Owners may contact Porsche customer service at 1-800-767-7243. Porsche's number for the recall is AH04.
AIR BAGS:SIDE/WINDOW · 16V946000
2016-12-30
Porsche Cars North America, Inc. (Porsche) is recalling certain model year 2017 718 Boxster, 718 Boxster S, 718 Cayman, 718 Cayman S, 911 Carrera, 911 Carrera S, 911 Carrera S Cabriolet, 911 Carrera 4S, 911 Turbo, 911 Turbo S, 911 Carrera 4S Cabriolet, and 911 Turbo Cabriolet vehicles. The seat mounted side air bag inflator initiator may fail to ignite during a crash.
Consequence: If the air bag inflator initiator fails to ignite, the side air bag will not deploy, increasing the risk of injury in the event of a crash.
Remedy: Porsche will notify owners, and dealers will replace the affected air bag modules, free of charge. The recall began April 2017. Owners may contact Porsche customer service at 1-800-767-7243. Porsche's number for this recall is AG10.
Performance
Horsepower
540hp
Torque
486lb-ft
0–60 mph
2.8sec
Quarter mile
10.9sec
Top speed
198mph
Fuel economy (EPA)
City
19mpg
Highway
24mpg
Combined
21mpg
Fuel
Premium Gasoline
Capability & size
Curb weight
3,516lb
EPA class
Minicompact Cars
Wiper blades
991.2 generation (2017-2019). Same wiper specifications as 991.1.
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 2017 Porsche 911 Turbo 3.8L Twin Turbo H6 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.