1965-2026 model years · 20,800+ owner reports · Updated September 2026
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According to Au7o's analysis of 20,800+ owner reports, the 1965-2026 Porsche 911 has 31 documented known issues, with 10 rated critical. The most serious are Intermediate Shaft (IMS) Bearing Failure ($2,000-$4,500 repair), Cylinder Bore Scoring (Nikasil Wear) ($8,000-$25,000 repair), Timing Chain Tensioner and Guide Failure ($3,000-$7,000 repair), Coolant Pipe and Fitting Leaks ($800-$2,500 repair), Coolant Pump and Vacuum Valve Block Failure on 3.0L Twin-Turbo (Warranty Extended to 10 Years / 120,000 Miles) ($1,800-$3,500 repair), Windshield and Rear Window Bonding Failure (Recall 24V-155 / ARA3) ($0-$0 repair), Dashboard Console Breakage Compromising Passenger Airbag Deployment (Recall 22V-897 / ANB7) ($0-$0 repair), Center-Lock Wheel Bolt Fracture on Center-Lock-Equipped 992 Models (Recall 24V-809 / ARC4) ($0-$0 repair), Structural rust in kidney bowls, longitudinals, floor pan and battery box ($3,000-$30,000 repair) and Timing chain tensioner collapse on pre-1984 cars destroys the engine ($700-$1,800 repair). The most commonly reported issue is Intermediate Shaft (IMS) Bearing Failure with 5,500 owner reports. Across all issues with published estimates, repair costs range from $60 to $30,000. DIY maintenance guides at au7o.io.
VISIBILITY:WINDSHIELD
Porsche Cars North America, Inc. (Porsche) is recalling certain 2020-2024 911 vehicles. The front windshield and rear window may not be properly secured and can detach.
WHEELS:LUGS/NUTS/BOLTS/STUDS
Porsche Cars North America, Inc. (Porsche) is recalling certain 2025 Panamera, 2024 718 Cayman GT4 RS, 718 Spyder RS, and 2021-2024 911 vehicles. The center lock wheel bolt may fracture and cause the wheel to detach.
BACK OVER PREVENTION: SENSING SYSTEM: CAMERA
Porsche Cars North America, Inc. (Porsche) is recalling certain 2019-2025 Cayenne, Cayenne E-Hybrid, 2020-2025 911, Taycan, 2024-2025 Panamera, and 2025 Panamera E-Hybrid vehicles. The rearview camera image may not display when the vehicle is placed in reverse. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 111, "Rear Visibility."
EXTERIOR LIGHTING:LIGHTING CONTROL MODULE:SOFTWARE
Porsche Cars North America, Inc. (Porsche) is recalling certain 2025 911 vehicles. A software error in the front-end electronics control module may result in the low beam headlights creating a glare for oncoming traffic. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 108, "Lamps, Reflective Devices, and Associated Equipment."
SEAT BELTS: REAR/OTHER:BUCKLE ASSEMBLY
Porsche Cars North America, Inc. (Porsche) is recalling certain 2023 911 vehicles. The bolts for the rear seat belt buckles may not be tightened properly.
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According to Au7o's analysis of 20,800+ owner reports, the 1965-2026 Porsche 911 has 31 documented issues. The most frequently reported are: Intermediate Shaft (IMS) Bearing Failure, Cylinder Bore Scoring (Nikasil Wear), Timing Chain Tensioner and Guide Failure. Of these, 10 are rated critical and should be addressed promptly.
The 1965-2026 Porsche 911 has 31 known issues documented across 20,800+ owner reports. 10 issues are rated critical: Intermediate Shaft (IMS) Bearing Failure and Cylinder Bore Scoring (Nikasil Wear) and Timing Chain Tensioner and Guide Failure and Coolant Pipe and Fitting Leaks and Coolant Pump and Vacuum Valve Block Failure on 3.0L Twin-Turbo (Warranty Extended to 10 Years / 120,000 Miles) and Windshield and Rear Window Bonding Failure (Recall 24V-155 / ARA3) and Dashboard Console Breakage Compromising Passenger Airbag Deployment (Recall 22V-897 / ANB7) and Center-Lock Wheel Bolt Fracture on Center-Lock-Equipped 992 Models (Recall 24V-809 / ARC4) and Structural rust in kidney bowls, longitudinals, floor pan and battery box and Timing chain tensioner collapse on pre-1984 cars destroys the engine. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Porsche 911 issues range from $0 to $30,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Intermediate Shaft (IMS) Bearing Failure, typically costs $2,000-$4,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
Reliability varies across model years of the Porsche 911. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 1965-2026 Porsche 911 with 31 documented issues documented across 20,800+ owner reports.
The IMS bearing on 996 and early 997 flat-six engines is a single-row or dual-row sealed bearing that loses lubrication over time, leading to catastrophic bearing failure and engine destruction. The dual-row bearing (1999-2005) fails less frequently than the single-row (2006-2008… Repairs typically run $2,000-$4,500. Severity: high.
The 991-generation 911 suffers from cylinder bore scoring where the Lokasil cylinder liners develop deep vertical scores, typically on cylinders 1 and 6. This is caused by inadequate oil supply to the cylinder walls during cold starts and short-trip driving. The issue results in… Repairs typically run $8,000-$25,000. Severity: high.
The 991-generation timing chain tensioners can lose hydraulic pressure, particularly after the car has been sitting for extended periods. This allows chain slack on startup, which can jump timing and cause catastrophic valve-to-piston contact. The plastic chain guides also wear p… Repairs typically run $3,000-$7,000. Severity: high.
The plastic coolant pipes and quick-connect fittings on the 991 generation are prone to cracking and leaking, especially at the connections near the front radiators. The plastic becomes brittle with heat cycling and age. Coolant loss can be gradual and difficult to detect until t… Repairs typically run $800-$2,500. Severity: high.
Porsche extended the warranty on the coolant pump (Part ID 1950) and the valve block (Part ID 2423) to ten years from delivery or 120,000 miles for USA, Canada and Puerto Rico cars, specifically on the 991.2 Carrera family built for model years 2017-2018 with the 3.0-litre twin-t… Repairs typically run $1,800-$3,500. Severity: high.
Porsche's Part 573 report for recall 24V-155 states that on affected 992-generation 911s "the front and rear windows were not manufactured in accordance with the specifications and therefore not bonded sufficiently to the body." The root cause was a supplier cleaning-process erro… Repairs typically run $0-$0. Severity: high.
NHTSA recall 22V-897 covers 2022-2023 Porsche 911s in which the dashboard console may break during a crash where the passenger airbag deploys. Because the airbag pushes against the dashboard structure as it inflates, a console that fractures lets the bag deploy out of position, s… Repairs typically run $0-$0. Severity: high.
NHTSA recall 24V-809 covers 2021-2024 Porsche 911s (alongside 2024 718 Cayman GT4 RS and Spyder RS and the 2025 Panamera) in which "the center lock wheel bolt may fracture and cause the wheel to detach." A batch of center-lock nuts was manufactured out of specification. This is s… Repairs typically run $0-$0. Severity: high.
Pre-1976 911 bodies were NOT galvanized, and the unibody is full of closed box sections that trap moisture. The classic rot spots are the kidney bowls (where the rear torsion-bar tube/longitudinal meets the inner sill — a critical structural junction), the longitudinals (rocker b… Repairs typically run $3,000-$30,000. Severity: high.
Every 911 built through 1983 uses spring-loaded mechanical cam chain tensioners that lose their hydraulic damping oil and collapse with age and heat cycling. When a tensioner fails the slack timing chain jumps a tooth (or off the sprocket entirely), the cams lose sync with the cr… Repairs typically run $700-$1,800. Severity: high.
The rear main seal on the M96, M97, and MA1 flat-six engines is prone to leaking oil onto the clutch and flywheel. The seal hardens over time and the flange design allows oil to migrate past the seal. This is often discovered during clutch replacement or when oil drips appear und… Repairs typically run $1,500-$3,500. Severity: medium.
The AOS diaphragm on M96/M97 engines ruptures over time, causing unmetered air leaks into the intake manifold and excessive oil consumption. The failed AOS allows oil vapor to be drawn directly into the intake system rather than being separated and returned to the crankcase. This… Repairs typically run $500-$1,500. Severity: medium.
The direct injection system on 991 engines does not spray fuel over the intake valves, allowing carbon deposits to accumulate on the valve stems and ports. Over time this restricts airflow, causing rough idle, misfires, and reduced power. The flat-six layout makes walnut blasting… Repairs typically run $800-$1,800. Severity: medium.
Porsche Technical Information 07/25 ENU 4883 applies to the 911 Carrera GTS (992), 911 Carrera 4 GTS (992), 911 Turbo (992) and 911 Turbo S (992) from model year 2025 equipped with rear axle steering (M-no. 0N5). The customer complaint is that "the yellow warning message 'Rear ax… Repairs typically run $0-$300. Severity: medium.
Porsche Technical Information 96/22 ENU 1752 applies specifically to the 911 GT3 (992) and 911 GT3 with Touring Package (992), model years 2021 through 2022. On cars built before 27 January 2022 (engine number DRM 004177), "it is possible for the threaded insert, into which the o… Repairs typically run $150-$3,500. Severity: medium.
Porsche Technical Information 137/19 ENU WKJ7 opens a workshop campaign on model year 2020 911 (992) cars, stating that "during internal tests, Porsche has discovered that leaks can occur at the mechanical seal of the coolant pump over the service life of the vehicle. Coolant wil… Repairs typically run $0-$2,600. Severity: medium.
Porsche Technical Information 65/23 ENU 9152 covers 911 (992) model years 2022 through 2023 running central computer (PCM) software version 37xx. Porsche describes the condition as "the PCM cannot be switched on, fails intermittently during vehicle operation or starts up again in… Repairs typically run $0-$400. Severity: medium.
NHTSA recall 25V-079 covers 2025 Porsche 911s among other Porsche models. Porsche states that "a software error in the front-end electronics control module may result in the low beam headlights creating a glare for oncoming traffic," and that "excessive glare can decrease the vis… Repairs typically run $0-$0. Severity: medium.
Porsche Advanced Technical Information bulletin 1801 (Group 6, Part ID 6953) covers the 911 (991) Gen. II and 718 Boxster/Cayman (982) for model years 2017-2018. The driver gets an airbag warning in the instrument cluster and the workshop finds fault code 002502 'Key-operated swi… Repairs typically run $150-$600. Severity: medium.
Porsche Technical Information 88/20 ENU 3734, "Complaint - Oil Leaks on Double Clutch Transmission (Porsche Doppelkupplung PDK)," covers the 911 Carrera (992) from model year 2020 with the 8-speed automatic transmission (I-no. G1F) and the 8-speed all-wheel-drive transmission (I-… Repairs typically run $400-$4,000. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
