Porsche 991 911: Common Problems, Repair Costs & Specs

Written by Zach, an independent mechanic in the Pacific Northwest. Last reviewed September 2026. Spot a mistake? Tell me.

Common Issues

What goes wrong on the 991, how to spot it, and what it costs to fix.

Cooling System Leaks (Housings, Seals, and Radiators)

Advanced

Symptoms: Coolant loss, overheating warning, coolant puddles, sweet smell, temperature fluctuation

The 991's cooling system is a long circuit from the radiators in the nose to the engine at the back, with a lot of plastic housings, O-rings, and hose joints along the way. As it ages, the usual trouble is a seeping housing or joint, a tired expansion tank cap, or a leaking radiator rather than a dramatic pipe failure. Watch the coolant level and investigate any sweet smell or damp spots early.

Estimated Repair Costs

DIY $200–400

Shop $500–1,000

Usually a housing, seal, or radiator. Find it early.

Common Fixes

Replace plastic coolant pipes with aluminum upgrade
Coolant transfer pipe replacement (common failure)
Replace expansion tank if showing age
Water pump replacement as preventive maintenance
Flush and refill with proper coolant mix

Common Parts

Part	Part Number	Typical price
Coolant Transfer Pipe	991.106.637.01	$100–200
Coolant Pipe Kit (Aluminum)	Varies	$200–400

Sources: FCP Euro, Rennlist

Carbon Buildup on Intake Valves (DFI Engines)

Moderate

Symptoms: Rough idle, misfires, reduced power, poor fuel economy, hesitation under load

Every 991 engine is direct-injected, so fuel doesn't wash the backs of the intake valves and some carbon builds up over time. Porsche's engines seem less prone to it than many direct-injected designs, and plenty of cars never need attention. If a high-mileage car idles roughly or feels down on power, walnut blasting cleans the valves.

Estimated Repair Costs

DIY $200–400

Shop $500–1,000

Mild on these engines. Walnut blasting if it's needed.

Common Fixes

Walnut shell blasting (standard solution)
Chemical treatments (less invasive but less effective)
Catch can installation to reduce oil vapor deposits
Use Top Tier fuel with good detergent packages
Spirited driving helps but doesn't eliminate buildup

Common Parts

Part	Part Number	Typical price
Walnut Media	Varies	$30–50
Intake Gaskets	9A111024900	$25–50

Sources: Rennlist, Planet-9

PDK Transmission Issues

Advanced

Symptoms: Harsh shifts, jerky low-speed operation, shuddering, warning lights, delayed engagement

The PDK is generally reliable. Some low-speed jerkiness, especially cold, is normal behavior. The real problems are clutch wear, mechatronic unit failures, and software faults. Porsche's schedule calls for the PDK clutch fluid every 60,000 miles and the transmission fluid every 120,000 miles or 12 years. Many specialists change the transmission fluid at 60,000 too, and I'd follow them. Ask for proof on any car you're buying.

Estimated Repair Costs

DIY $150–250

Shop $400–2,000+

Clutch fluid at 60,000 miles; transmission fluid at 120,000 (many specialists say 60,000).

Common Fixes

PDK fluid change (recommended every 50,000-60,000 miles)
Software updates to address shift quality
Clutch adaptation reset via PIWIS diagnostic
Clutch pack replacement if severely worn
Mechatronic unit repair for electronic issues

Common Parts

Part	Part Number	Typical price
PDK Fluid (7L)	Pentosin FFL-2	$150–200
PDK Filter	9G132153300	$40–80

Sources: Rennlist, Planet-9

PASM Suspension Damper Failures

Moderate

Symptoms: PASM warning light, harsh ride, damper leaking, clunking noises, uneven handling

PASM dampers adjust their stiffness electronically. They fail by leaking or with electrical faults, which brings up a warning and can leave the system stuck in one setting. They cost a lot more than conventional shocks, though remanufactured units help.

Estimated Repair Costs

DIY $400–800

Shop $800–1,500

Remanufactured dampers are available.

Common Fixes

Diagnose with Porsche diagnostic tool (PIWIS)
Replace failed PASM damper (oem or remanufactured)
Some owners convert to quality coilovers when multiple fail
Check wiring and connectors before replacing damper
Remanufactured dampers available at reduced cost

Common Parts

Part	Part Number	Typical price
PASM Damper (Front)	991.343.053.15	$600–1,000
PASM Damper (Rear)	991.333.053.16	$600–1,000
PASM (Remanufactured)	Varies	$350–550

Sources: Rennlist, Pelican Parts

Oil Consumption Concerns

Moderate

Symptoms: Low oil warnings, need to add oil between changes, blue smoke on startup, oil smell

Some 991.1 engines use more oil than owners expect, and Porsche's published allowance is generous. It's usually not a sign of a failing engine, but it means you need to check the level regularly and never let it run low. A sudden increase is worth investigating.

Estimated Repair Costs

DIY $50–100

Shop $100–500

Monitor and top up. A sudden change needs diagnosis.

Common Fixes

Monitor oil level regularly using on-board system
Keep oil level in proper range (not overfilled)
Some owners report improvement with different oil brands
Severe consumption may indicate piston ring issues
Compression and leak-down test for diagnosis

Common Parts

Part	Part Number	Typical price
Engine Oil (10L)	Mobil 1 0W-40	$80–120
Oil Filter	991.107.225.53	$20–40

Sources: Rennlist, Porsche Club of America

Turbo-Specific Issues (991.2 Carrera)

Advanced

Symptoms: Boost inconsistency, wastegate rattle, turbo whine, check engine light, reduced power

The 991.2 Carreras moved to a twin-turbo 3.0L. The turbos are generally dependable, but wastegate rattle, actuator faults, and seal leaks do show up, and the feed and drain lines deserve a look at service time. It's a more complex engine than the naturally aspirated 991.1.

Estimated Repair Costs

DIY $100–300

Shop $500–2,000+

Wastegate rattle and boost faults are the common ones.

Common Fixes

Wastegate actuator adjustment or replacement
Turbo oil line inspection and replacement
Intercooler inspection for leaks
Boost leak testing if low power complaints
Proper warm-up and cool-down for turbo longevity

Common Parts

Part	Part Number	Typical price
Wastegate Actuator	9A112180101	$300–500
Turbo Oil Line Kit	Varies	$100–200

Sources: Rennlist, 6SpeedOnline

Convertible Top Issues (Cabriolet)

Moderate

Symptoms: Slow operation, error messages, hydraulic leaks, top doesn't complete cycle, fabric wear

The Cabriolet's top is hydraulic and complex. Pumps wear, microswitches fail, and ram seals leak, and the fabric wears at its stress points. Cycling it regularly and keeping the drains clear helps it last.

Estimated Repair Costs

DIY $100–400

Shop $500–1,500

Cabriolet only.

Common Fixes

Hydraulic system inspection and fluid top-off
Hydraulic pump replacement if failing
Microswitch adjustment or replacement
Top fabric replacement for worn or damaged tops
System reset procedure after battery work

Common Parts

Part	Part Number	Typical price
Hydraulic Pump	991.561.609.01	$500–800
Microswitch Kit	Varies	$50–100

Sources: Rennlist, Pelican Parts

Electric Steering Column Issues

Moderate

Symptoms: Creaking noise, steering feel inconsistency, steering wheel off-center, warning lights

The 991 uses electric power steering. Some owners report creaks from the column at low speed, usually cured with lubrication, and occasional software-related warnings that a dealer update can fix.

Estimated Repair Costs

DIY $50–150

Shop $200–500

Lubrication usually cures the creak.

Common Fixes

Steering column lubrication for creaking
Software update for steering feel issues
Steering rack inspection if play detected
Steering angle sensor recalibration
Full diagnosis with Porsche diagnostic tool

Common Parts

Part	Part Number	Typical price
Steering Column Lube	Varies	$15–30
Steering Angle Sensor	991.361.155.00	$200–350

Sources: Rennlist, Planet-9

Restoration Guides

The bigger jobs: step-by-step, with parts lists, tools, and the mistakes to avoid.

Complete Suspension Refresh

Intermediate 12-16 hours $800-1,600

Bushings and joints on the 991's multi-link chassis, plus what to know if your car has PASM dampers.

Interval Every 60,000-80,000 miles

Cost (DIY) $800-1,600

Labor 10-14 hours shop time

Parts List

Part	OEM part #	Aftermarket	Typical cost
Front Control Arm (Left)	99134105314	Lemforder	$130-220
Front Control Arm (Right)	99134105414	Lemforder	$130-220
Front Thrust Arm (Pair)	99134105500	Lemforder	$120-200
Front Strut Mount (Pair)	99134351900	Sachs	$100-180
Tie Rod End (Pair)	99134713100	Lemforder	$80-140
Rear Control Arm Upper (Pair)	99133105105	Lemforder	$140-240
Rear Control Arm Lower (Pair)	99133105205	Lemforder	$140-240
PASM Damper (Front)	99134305315	Remanufactured	$350-1000
PASM Damper (Rear)	99133305316	Remanufactured	$350-1000
Sway Bar End Link (Pair)	99134306901	Lemforder	$50-100

Tools

Floor jack and jack stands
18mm, 19mm, 21mm sockets
Ball joint separator
Spring compressor
Torque wrench
Penetrating oil
PIWIS diagnostic tool (for PASM)
Alignment specs printout

Step by step

Raise vehicle on jack stands at all four corners.
Remove wheels and photograph suspension.
For PASM cars: diagnose failed dampers before ordering parts.
Soak all bolts with penetrating oil.
Front: Remove sway bar links (48 ft-lbs), tie rod ends (48 ft-lbs).
Remove control arm bolts (89 ft-lbs) and ball joint (56 ft-lbs).
For struts: mark camber, remove upper mount nuts (23 ft-lbs), pinch bolt (65 ft-lbs).
Use spring compressor to replace strut mount.
Rear: Remove control arms (81 ft-lbs inner, 74 ft-lbs eccentric).
Replace PASM dampers if leaking or failed.
Install all new components with correct torque specs.
Install wheels and lower vehicle.
Professional alignment mandatory - 991 is very alignment-sensitive.

Tips

The 991 uses electronic steering—sensitive to alignment.
PASM dampers fail more often than conventional shocks.
Remanufactured PASM units offer good value.
991.2 turbo models have stiffer suspension—same procedure.

Watch out

PASM requires PIWIS to calibrate after replacement.
Spring compressors are dangerous.
Rear-engine weight distribution amplifies issues.
Center-lock wheel torque is 443 ft-lbs—different tool required.

References

Rust Prevention and Inspection

Intermediate 4-12 hours $100-800

Rust isn't the 991's problem. This is about drains, water intrusion, and the cooling system parts underneath.

Interval Inspect annually

Cost (DIY) $100-800

Labor Varies by severity

Parts List

Part	OEM part #	Aftermarket	Typical cost
Front Trunk Seal	99156193100	URO	$70-140
Door Seal Set	99153193101	URO	$120-240
Headlight Seal Kit	Various	Butyl tape	$30-80
Coolant Transfer Pipe	99110663701	Aluminum upgrade	$100-300
Rust Converter	—	POR-15	$20-40
Cavity Wax	—	Fluid Film	$15-30

Tools

Inspection mirror and flashlight
Wire brush
Compressed air
Respirator

Step by step

The 991 is fully galvanized—structural rust is rare.
Clean undercarriage before inspection.
Check front trunk for water—electronics located here.
Clear sunroof and frunk drain tubes.
Inspect coolant transfer pipe—known failure point.
Check led headlights for condensation (less common than hid).
Examine rocker panels and door bottoms.
Check wheel wells for debris damage.
Surface rust: wire brush, convert, prime, topcoat.
Apply cavity wax to hollow sections annually.
Inspect all cooling system plastic for cracks.

Tips

991s are well-protected—most issues are water intrusion.
Coolant transfer pipe failure is main concern, not rust.
led headlights less prone to moisture than older hid.
Annual Fluid Film application provides protection.

Watch out

Water in frunk damages electronics.
Coolant leak can cause overheating before rust.
Always wear respirator when grinding.

References

Electrical System Service

Intermediate 8-14 hours $300-1,000

Ignition, PDK service, and the common electronic faults.

Interval Address as symptoms appear

Cost (DIY) $300-1,000

Labor 6-10 hours shop time

Parts List

Part	OEM part #	Aftermarket	Typical cost
Ignition Coil Pack (Set of 6)	99160210402	Bosch	$180-350
PDK Fluid (7L)	Pentosin FFL-2	Pentosin	$150-200
PDK Filter	9G132153300	OEM	$40-80
Wastegate Actuator (991.2)	9A112180101	OEM	$300-500
PASM Module	99161830100	Rebuilt	$200-400
Steering Column Lube	Various	White lithium	$15-30
Battery (AGM)	99961101501	Exide, Optima	$300-500

Tools

PIWIS or compatible diagnostic tool
Torx driver set
10mm socket
Drain pan for PDK service
Battery registration tool
Contact cleaner
Dielectric grease

Step by step

Begin with full diagnostic scan - 991 requires PIWIS for many functions.
For coils: open engine lid, disconnect and remove.
991.2 turbo: inspect wastegate actuators for rattle.
For PDK service: drain and fill with Pentosin ffl-2.
Reset clutch adaptation via PIWIS after PDK service.
For battery replacement: register new battery in DME.
For steering column creak: lubricate steering column.
Clean all ground points.
Clear codes and verify repairs.
Perform adaptations as required.

Tips

991 requires PIWIS for many diagnostic functions.
Change the PDK fluids on schedule: clutch fluid every 60,000 miles, transmission fluid every 120,000 (many specialists say 60,000).
Battery registration mandatory or charging issues result.
991.2 wastegate rattle is common—not always serious.

Watch out

Battery must be registered in DME.
PDK service requires proper fluid—no substitutes.
PASM coding requires dealer-level tool.
991.2 turbo components are more complex.

References

Interior Restoration

Intermediate 10-18 hours $300-1,000

Leather, the PCM infotainment system, and the common wear items.

Interval As needed

Cost (DIY) $300-1,000

Labor 8-14 hours shop time

Parts List

Part	OEM part #	Aftermarket	Typical cost
Leather Repair Kit	—	Leatherique, Colourlock	$50-100
Steering Wheel Re-wrap	—	Professional service	$250-450
Shift Knob (Manual)	99142407504	Aftermarket	$80-200
Seat Foam (Driver)	99152191203	Recovered	$100-200
Cabin Air Filter	99157221901	Mann, Bosch	$30-60
Door Seal Set	99153193101	URO	$120-240
HVAC Blend Actuator	99157319100	VDO	$70-140
PCM Screen Protector	—	Aftermarket	$20-40

Tools

Trim removal tools
Torx driver set
Microfiber cloths
Leather cleaner and conditioner
Interior detailing brushes
PIWIS for PCM updates

Step by step

Document condition with photos.
Clean leather with dedicated cleaner.
Fill cracks with leather filler, sand, dye.
Condition all leather surfaces.
Assess steering wheel—rewrap if worn.
Replace worn boots and knobs.
Replace cabin air filter.
Clean HVAC vents with brushes.
Address seat bolster wear.
Replace door seals if wind noise present.
Update pcm software if available.
Apply UV protectant to exposed surfaces.

Tips

991 uses high-quality leather that responds well to care.
Sport Plus seats have more aggressive bolsters.
pcm touch screen can benefit from protector.
HVAC clicking indicates blend actuator failure.

Watch out

Don't use silicone on leather.
Steering wheel has airbag—disconnect battery.
pcm updates require dealer or compatible tool.

References

PDK Service Check and Adaptation

Advanced 2-4 hours $400-900

A PDK that shifts roughly is often overdue for its fluid service or an adaptation reset, not a rebuild. How to check the history, what the service involves, and when to leave it to a specialist.

Cost (DIY) $400-900

Parts List

Part	OEM part #	Aftermarket	Typical cost
PDK transmission fluid	—	Genuine Porsche	$150-300
PDK clutch fluid	—	Genuine Porsche	$60-120
Filter and drain plug seals	—	—	$40-80

Tools

Lift or level jack stands
Porsche-capable diagnostic tool (PIWIS or equivalent)
Fluid pump
Torque wrench

Step by step

Check the service history. Porsche's schedule calls for the PDK clutch fluid every 60,000 miles and the transmission fluid every 120,000 miles or 12 years, and many cars miss both.
Scan for transmission fault codes before changing anything.
Raise the car level. The fill level is checked with the car level and at a set fluid temperature.
Drain the old fluid and replace the filter and seals.
Refill with the correct Porsche fluid using a pump.
Check the level at the specified temperature with the diagnostic tool, which reads it for you.
Run the clutch adaptation routine with the diagnostic tool.
Test drive and note whether shifts are smoother.

Tips

If there's no record of a PDK service, budget for one at purchase. Many specialists change the transmission fluid at 60,000 miles rather than waiting for 120,000.
Rough low-speed shifts after a battery disconnect often just need adaptation.

Watch out

The level check depends on temperature and needs a diagnostic tool. Without one, leave this to a specialist.
Only use Porsche-specified fluids.

References

DIY Maintenance

The routine work you can do on a Saturday with hand tools and jack stands.

Oil Change

Easy 30 min $70-100

Oil and filter on the 991.1 and 991.2 engines.

Interval Every 10,000 miles or 1 year (some owners prefer 5,000-7,500)

Cost (DIY) $70-100

Tools

19mm socket for drain plug
76mm oil filter cap wrench
Drain pan (10L capacity)
Funnel
Torque wrench
Ramps or jack and jack stands

Step by step

Warm the engine for 2-3 minutes to thin the oil for better drainage.
Drive onto ramps or raise vehicle and support on jack stands.
Locate the oil drain plug on the bottom of the engine case - 19mm socket.
Position drain pan and remove drain plug—be careful of hot oil.
While oil drains, locate the cartridge oil filter housing on top of engine.
Remove oil filter cap using 76mm cap wrench—turn counterclockwise.
Pull out old filter element and discard. Clean housing interior.
Allow oil to drain completely (15+ minutes for thorough drain).
Install new crush washer on drain plug and reinstall—torque to 37 ft-lbs (50 Nm).
Install new filter element and replace o-ring on cap (lube with fresh oil).
Reinstall filter cap and torque to 19 ft-lbs (26 Nm).
Lower vehicle and add approximately 8.5-9 quarts of 0W-40 full synthetic.
Start engine and check for leaks at drain plug and filter housing.
Check oil level using the dashboard display—add oil to proper level.
Reset the service interval in the instrument cluster.

Tips

991.1 cars may consume oil—monitor level between changes and top up as needed.
Use only oils meeting Porsche A40 specification (Mobil 1, Motul 8100, etc.).
991.2 turbo models are especially important to use quality oil.
Don't overfill—check level after running engine and letting it sit.
Save some fresh oil in your trunk for top-ups on 991.1 cars.

Brake Pad Replacement

Easy 1-2 hours $150-350

Front and rear pads, including the electronic wear sensor reset.

Interval Every 20,000-40,000 miles depending on driving style

Cost (DIY) $150-350

Tools

19mm socket for wheel bolts
7mm hex/Allen socket for caliper guide pins
Brake piston retractor (rear requires screw-in type)
Wire brush
Brake cleaner
Anti-seize lubricant
Torque wrench
Diagnostic tool for sensor reset (optional)

Step by step

Loosen wheel bolts slightly before raising the vehicle.
Raise and safely support vehicle on jack stands at designated lift points.
Remove wheel bolts (19mm) and remove wheel.
Disconnect the brake pad wear sensor connector from the caliper.
Remove the two caliper guide pin bolts (7mm hex).
Swing the caliper upward and secure it—don't let it hang by the hose.
Remove old brake pads and note wear sensor position.
Clean caliper bracket slides and pad contact areas with brake cleaner.
Inspect rotor thickness and condition—replace if below minimum spec.
Front: Compress piston straight back into caliper using piston tool.
Rear: Rotate piston clockwise while pressing—requires screw-in tool.
Apply thin brake lubricant to pad backing plates and slide areas.
Install new pads with wear sensor on inner pad (inboard side).
Swing caliper back down and reinstall guide pin bolts—torque to 25 ft-lbs.
Reconnect wear sensor connector.
Reinstall wheel and torque bolts to 118 ft-lbs (160 Nm) in star pattern.
Pump brake pedal multiple times to seat pads before driving.

Tips

991 has electronic brake pad monitoring—sensors are single-use, replace with pads.
After pad replacement, the warning may stay on until cleared with diagnostic tool.
PCCB (ceramic composite brakes) require dealer service—don't attempt diy.
Bed new pads properly: multiple moderate stops, then light driving to cool.
Open fluid reservoir cap before compressing pistons to prevent overflow.

Spark Plug Replacement

Easy 1-2 hours $100-180

Plugs on the naturally aspirated and turbocharged engines. The turbo cars need them more often.

Interval Every 40,000-60,000 miles

Cost (DIY) $100-180

Tools

10mm socket for coil bolts
5/8" (16mm) spark plug socket with rubber insert
6" and 12" extensions
Torque wrench
Anti-seize compound
Dielectric grease
Compressed air

Step by step

Allow engine to cool completely—aluminum heads don't like being worked on hot.
Remove any engine covers for better access to coil packs.
Disconnect the electrical connector from each ignition coil by pressing the release tab.
Remove the coil pack mounting bolt (10mm) from each of the six coils.
Pull each coil pack straight up and out of the spark plug tube.
Use compressed air to blow any debris out of the spark plug wells.
Using a 5/8" spark plug socket with extension, remove each plug.
Inspect each removed plug for abnormal wear, oil fouling, or damage.
Check spark plug gap on new plugs (should be factory preset).
Apply a thin coating of anti-seize to new plug threads (keep off electrode).
Thread new plugs in by hand first to prevent cross-threading.
Torque plugs to 22 ft-lbs (30 Nm)—do not overtighten.
Apply dielectric grease to inside of coil pack boots.
Reinstall coil packs and torque mounting bolts to 7 ft-lbs (10 Nm).
Reconnect all coil pack connectors until they click.

Tips

991.2 turbo models may have slightly different access—same basic procedure.
Use only oem or equivalent quality plugs (ngk or Bosch).
Never install plugs in a hot engine—severe risk of thread damage.
If plug is hard to turn, stop and apply penetrating oil—don't force it.
Check for any stored fault codes after completion if you have a scanner.

Coolant Flush

Moderate 1-2 hours $50-80

Drain and refill the cooling system with fresh coolant to keep corrosion out of a very expensive engine.

Interval Every 4 years or 40,000 miles

Cost (DIY) $50-80

Tools

Drain pan (2+ gallon capacity)
Distilled water
G40 or G48 coolant concentrate (Porsche approved)
Coolant funnel or vacuum fill tool
Phillips screwdriver
Pliers

Step by step

Allow engine to cool completely—never open cooling system when hot.
Locate the coolant drain on the radiator and position drain pan.
Open the expansion tank cap to allow air in and speed draining.
Open radiator drain and allow coolant to drain completely.
Inspect drained coolant color and condition—rust indicates problems.
Close drain and add distilled water to flush the system.
Run engine to operating temperature with heater on max to circulate.
Allow to cool, drain flush water, and repeat until water runs clear.
Close all drains and prepare 50/50 coolant mix (or use pre-mixed).
Slowly fill system through expansion tank—this takes patience.
Start engine with expansion tank cap off to allow air to escape.
Run engine to operating temperature and top off as air purges.
Check for leaks at all connections and hoses.
Install expansion tank cap and verify proper coolant level when cold.
Check level again after driving and engine has cooled.

Tips

Use only Porsche-approved G40 or G48 coolant—mixing types causes problems.
The 991's long coolant runs make air purging challenging—take your time.
A vacuum fill system makes this job much easier and faster.
Inspect plastic coolant pipes while system is drained—replace if cracked.
This is a good time to replace thermostat if original and over 60k miles.

Torque Specs

Values for common service jobs. Check the source listed for each table, and your own manual, before you torque anything critical.

Where these numbers come from

Engine

Component	Torque Spec	Notes
Spark Plugs	22 ft-lbs (30 Nm)	-
Ignition Coil Bolts	7 ft-lbs (10 Nm)	-
Oil Drain Plug	37 ft-lbs (50 Nm)	Replace crush washer
Oil Filter Housing Cap	19 ft-lbs (26 Nm)	-
Intake Manifold	7 ft-lbs (10 Nm)	-
Engine Mount Bolts (Top)	23 ft-lbs (31 Nm)	-
Engine Mount Thru-Bolt	63 ft-lbs (85 Nm)	-
Coolant Pipe Fittings	15 ft-lbs (20 Nm)	New o-rings
Turbo Oil Lines (991.2)	15 ft-lbs (20 Nm)	Turbo models

Suspension

Component	Torque Spec	Notes
Wheel Lug Bolts	118 ft-lbs (160 Nm)	Center-lock different (443 ft-lbs)
Front Strut Pinch Bolt	65 ft-lbs (85 Nm)	-
Front Control Arm to Frame	89 ft-lbs (120 Nm)	-
Front Control Arm Ball Joint	56 ft-lbs (76 Nm)	-
Front Thrust Arm to Frame	118 ft-lbs (160 Nm)	-
PASM Damper Top Nut	23 ft-lbs (31 Nm)	-
Tie Rod End Nut	48 ft-lbs (65 Nm)	-
Sway Bar End Links	48 ft-lbs (65 Nm)	-
Rear Control Arm Eccentric	74 ft-lbs (100 Nm)	-
Rear Upper Control Arm	81 ft-lbs (110 Nm)	-

Brakes

Component	Torque Spec	Notes
Front Caliper Bolts	63 ft-lbs (85 Nm)	Use new bolts
Rear Caliper Bolts	63 ft-lbs (85 Nm)	Use new bolts
PCCB Caliper Bolts	74 ft-lbs (100 Nm)	Ceramic brake cars
Brake Rotor Screws	7 ft-lbs (10 Nm)	-
Brake Line Fittings	13 ft-lbs (18 Nm)	-
Wheel Speed Sensor	7 ft-lbs (10 Nm)	-

Parts & Suppliers

Where I'd shop for 991 parts: genuine, performance, used, and the specialists.

OEM Featured

FCP Euro

Lifetime replacement guarantee—growing 991 coverage as parts become available

Lifetime Warranty OE Quality

Free over $49 Lifetime

OEM Featured

Pelican Parts

Deep 991 parts catalog with emerging DIY tech articles

OEM Parts Tech Articles

Free over $99

OEM

Porsche Parts

Factory genuine Porsche parts—often the best source for 991-specific items

Factory Original Genuine Porsche

Genuine OEM

OEM

Sunset Porsche Parts

Porsche dealer parts department with competitive OEM pricing

OEM Dealer New Genuine Parts

Fast shipping

Performance Featured

Fabspeed

Premium exhaust systems that transform the 991's character without drone

Exhaust Systems Performance Parts

Performance Featured

Dundon Motorsports

Race-inspired exhaust systems—especially popular for GT3 and GT3 RS

Exhaust GT Parts Race Quality

Performance

Softronic

ECU tuning to extract more power from the 991's engine

ECU Tuning Performance Software

Performance

JRZ Suspension

Professional-grade coilovers for track use—popular with HPDE enthusiasts

Coilovers Race Suspension

Performance

KW Suspensions

Premium coilover systems for street and track 991s

Coilovers Street/Track

Performance

AWE Tuning

Performance exhaust systems and intake upgrades

Exhaust Intakes

General

AutohausAZ

Growing selection of 991 replacement parts at competitive prices

Replacement Parts Maintenance Items

Free over $99

General

ECS Tuning

Wide selection of OEM and aftermarket parts with detailed fitment

OEM Parts Aftermarket Options

Free over $99

General

PartsGeek

Budget-friendly replacement parts for common maintenance

Budget Parts Fast Shipping

Specialist Featured

GMG Racing

Track-focused upgrades and complete race preparation—extensive 991 GT3 experience

Track Parts Race Prep GT Builds

Specialist Featured

SharkWerks

Performance shop with deep 991 expertise—known for GT car work

GT Models Engine Work Full Builds

Specialist

BBI Autosport

Custom builds and track preparation for 991 GT cars

Custom Builds Turbo Conversions

Specialist

Champion Motorsport

Premium wheels and performance parts for the 991 platform

Wheels Performance Parts

Used/NOS Featured

Rennlist 991 Classifieds

Active 991 community marketplace—good selection of used OEM and aftermarket

991 Community Vetted Sellers

Used/NOS

6SpeedOnline Classifieds

Large enthusiast community with active 991 parts section

Forum Marketplace Enthusiast Parts

Used/NOS

eBay Motors

Global marketplace for used and NOS 991 parts

Used Parts NOS Global Sellers

Used/NOS

Car-Part.com

Search nationwide salvage yard inventory—good for body panels

Salvage Parts Body Panels

Useful references

Pelican Parts Tech Articles Growing library of 991 DIY articles with step-by-step instructions PIWIS/Durametric Diagnostic Diagnostic software—the 991's complex systems require dealer-level tools 991 Technical Forum Rennlist's 991 section has extensive DIY threads and technical discussions

Community Resources

Where 991 owners hang out: forums, YouTube channels, and clubs worth your time.

Own a 991?

Track it in My Garage

Add your car and you get a 991 service schedule with intervals already filled in, a restoration tracker organized by system, and a log of every job and what it cost. It's free, and it's the same on your phone and your laptop.

Add my 991 See all tools