The 991.2-generation 911 (2017-2019) is generally robust, but the 3.0L twin-turbo models can suffer catastrophic engine failures from bearing wear, while all variants share some typical Porsche aging issues around mounts and cooling systems.
Connecting Rod Bearing Failure (3.0L Twin Turbo)
Occasional · high severity
Typical onset: 30,000-70,000 mi
Symptoms: Metallic knocking or rattling at idle, especially when cold, Low oil pressure warning intermittently or at startup, Metal debris visible in oil during changes, Sudden catastrophic engine failure with no warning in worst cases
Fix: Engine-out procedure required for bearing inspection/replacement. If caught early, bearing replacement alone takes 25-35 hours. If spun bearing damaged crank or block, full short block or engine rebuild needed at 50-80 hours. Many opt for factory long block exchange.
Estimated cost: $15,000-35,000
Transmission Oil Cooler Line Leaks
Common · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Transmission fluid spots under car, usually passenger side, Burnt fluid smell after spirited driving, Slightly delayed shifts or slipping when fluid level drops, Visible seepage around cooler fittings at the transmission tunnel
Fix: Requires dropping exhaust and heat shields to access cooler lines. Lines typically corrode at crimp fittings. Replacement involves 4-6 hours labor for PDK models, slightly less for manual. Use OEM lines only—aftermarket fittings fail quickly.
Estimated cost: $800-1,500
Transmission Mount Failure (PDK)
Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: Clunking when shifting from reverse to drive or vice versa, Excessive vibration through cabin at idle in gear, Visible tearing or separation of rubber mount under inspection, Drivetrain 'slop' felt during throttle tip-in
Fix: Mount sits between transmission and chassis tunnel. Access requires lifting vehicle and removing heat shields. The mount itself is straightforward, 2-3 hours labor. Often done with other transmission services to save time.
Estimated cost: $600-1,000
Fuel Filter Clogging (Direct Injection Carbon)
Occasional · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Rough idle with misfires, especially when warm, Hesitation or stumble during hard acceleration, Check engine light with lean fuel trim codes or misfire codes, Loss of power at high RPM
Fix: Filter is in-tank on most 991.2 models, requiring fuel tank drop (8-10 hours). Carbon buildup on intake valves exacerbates fueling issues—often walnut blasting is done simultaneously, adding 4-6 hours. Some techs recommend cleaning every 40k-50k miles preventatively.
Estimated cost: $1,200-2,500
Side Curtain Airbag Deployment Risk (Recall)
Rare · high severity
Symptoms: No symptoms under normal use—silent safety defect, Airbag warning light may illuminate in affected vehicles, Risk of non-deployment or improper deployment in side-impact collision
Fix: Factory recall repair involves replacing side airbag modules. Dealer-only repair, typically 2-3 hours per side. Check VIN against NHTSA database (recall 19V-542) before purchase—some units still unrepaired.
Estimated cost: $0 (recall repair)
Windshield Adhesive Separation (Recall)
Rare · medium severity
Symptoms: Wind noise at highway speeds around windshield edges, Visible gaps between windshield and A-pillar trim, Water intrusion at base of windshield during car washes, Windshield movement or flexing on rough roads
Fix: Factory recall involves windshield removal, cleaning, and reinstallation with proper adhesive. Dealer repair, 3-4 hours. Recall 18V-363—affects cars built in specific production windows. Critical for structural integrity in rollover.
Estimated cost: $0 (recall repair)
Coolant Reservoir Cracking
Occasional · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Coolant smell from engine bay, especially after heat cycles, Visible coolant seepage or staining on plastic tank, Low coolant warning light with no external leaks visible, Steam from front trunk area after hard driving
Fix: Plastic reservoir develops stress cracks from heat cycling. Located in front trunk, relatively easy access. Replacement takes 1-2 hours including coolant drain/refill and bleeding. Always replace cap simultaneously—old caps lose pressure seal.
Estimated cost: $400-700
Owner tips
Send oil samples to Blackstone Labs every 5,000 miles on 3.0T engines—early bearing wear shows up as elevated aluminum/copper
Budget $2,000-3,000/year for maintenance on any 991—these aren't cheap to own even when reliable
Pre-purchase inspection must include transmission mount visual check and oil analysis—walk away from cars with metal in oil
Extended warranty is smart on 3.0T models if you're keeping past 50k miles—engine failures are financially catastrophic
Buy the naturally-aspirated 3.4L or 3.8L with confidence; gamble carefully on the 3.0 twin-turbo unless you have deep pockets or comprehensive warranty coverage.
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: AGM battery required; located in front trunk; H8 (Group 48) size specific to 991.2 chassis turbocharged models
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Every control module on the 2012-2017 Porsche 911 — 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.
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
370hp
Torque
331lb-ft
0–60 mph
4.0sec
Quarter mile
12.4sec
Top speed
183mph
Fuel economy (EPA)
City
20mpg
Highway
28mpg
Combined
22mpg
Fuel
Premium Gasoline
Capability & size
Curb weight
3,250lb
EPA class
Minicompact Cars
Wiper blades
991 generation (2012-2019). Different lengths for driver and passenger. Coupe body style has no rear wiper.
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 3.0L 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.