According to Au7o's analysis of 800+ owner reports, the 2021 Porsche 911 has 1 documented known issues, with 1 rated critical. The most serious is Water-Cooled Cylinder Scoring on 992 Generation ($10,000-$30,000 repair). The most commonly reported issue is Water-Cooled Cylinder Scoring on 992 Generation with 800 owner reports. Across all issues, repair costs range from $10,000 to $30,000. DIY maintenance guides at au7o.io.
On the 2020-2025 Porsche 911, the 992-generation 911 continues to experience cylinder bore scoring issues despite Porsche's design changes. Reports of scoring on the water-cooled flat-six engines have appeared as early as 20,000 miles. The root cause is believed to be related to insufficient cylinder wall oiling during cold starts and thermal shock from aggressive driving before the engine is fully warmed.
Common Symptoms
Increasing oil consumption over time
Light metallic rattling from engine on cold start
Oil analysis showing elevated iron and aluminum
Visible scoring on borescope inspection
Slightly rough idle when cold
How to Fix
Monitor oil consumption closely. If scoring is detected via borescope inspection, the engine block requires cylinder re-sleeving or replacement. Porsche has covered some cases under warranty. Always allow the engine to reach operating temperature before high-RPM driving.
What Owners Are Using
Parts and tips from 800+ owners who fixed this issue
NoteGet a borescope inspection at every major service interval on 992 engines. Early detection gives you the best chance of warranty coverage from Porsche.
Medium Confidence800 reportsLast reported by owners Mar 2026Reviewed Mar 2026
⚠️NHTSA Recalls9 recalls
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."
Campaign #25V07900012/02/2025
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."
Campaign #25V89600019/12/2025
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.
Campaign #24V15500028/02/2024
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.
Campaign #24V80900028/10/2024
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.
According to Au7o's analysis of 800+ owner reports, the 2021-2021 Porsche 911 has 1 documented issues. The most frequently reported are: Water-Cooled Cylinder Scoring on 992 Generation. Of these, 1 is rated critical and should be addressed promptly.
Is the Porsche 911 reliable?
The 2021-2021 Porsche 911 has 1 known issues documented across 800+ owner reports. 1 issue is rated critical: Water-Cooled Cylinder Scoring on 992 Generation. 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.
How much does it cost to fix common Porsche 911 problems?
Repair costs for known Porsche 911 issues range from $10,000 to $30,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Water-Cooled Cylinder Scoring on 992 Generation, typically costs $10,000-$30,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2020-2025 Porsche 911 Water-Cooled Cylinder Scoring on 992 Generation?
The 992-generation 911 continues to experience cylinder bore scoring issues despite Porsche's design changes. Reports of scoring on the water-cooled flat-six engines have appeared as early as 20,000 miles. The root cause is believed to be related to insufficient cylinder wall oil… Repairs typically run $10,000-$30,000. Severity: high.
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.
