The fuel injection problem on cylinder 2 and 4 had injector electrical faults for the last two years resulting in reduced power warning. I finally took my car to the dealer for an analysis. After their analysis here is their statement on the service invoice: "Client state check engine light comes on and vehicle will run rough - Client scan for codes and had codes P0202 & P0204. Cylinder 2 and 4 fuel injector electrical faults. After updating DME software, clearing faults and test driving, mil illuminated again. Quoted fuel injector replacement. Due to the large amount of labor required for replacement, all 6 have been quoted to circumvent a potentially bad batch and to prevent a re-visit to replace any additional injectors at a later date." I had to pay almost $11,000 to replace "bad batch" injectors on a car that has only 13,455 miles. If they are "bad" injectors, is this a wider problem than my vehicle?
The worst 2021 Porsche 911 problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Fuel system3
- Seats1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Fuel system3
- Seats1
Recalls 6
Back over prevention: sensing system: camera
- What is wrong
- 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."
- Risk
- A rearview image that does not display properly reduces the driver's view behind the vehicle, increasing the risk of a crash.
- Remedy
- Dealers will update the driver assistance software, free of charge. Owner notification letters were mailed February 13, 2026. Owners may contact Porsche customer service at 1‑800‑767‑7243. Porsche's number for this recall is ASB2. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on beginning January 19, 2026.
Recall number 25V896000 · Recall details
Wheels: lugs/nuts/bolts/studs
- What is wrong
- 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.
- Risk
- Wheel detachment can result in a loss of vehicle control, increasing the risk of a crash.
- Remedy
- Owners should not drive their vehicles until they have been repaired. Dealers will check the center lock wheel fastening system and replace any incorrectly manufactured parts, as necessary, free of charge. Owner notification letters were mailed on January 24, 2024. Owners may contact Porsche customer service at 1‑800‑767‑7243. Porsche's number for this recall is ARC4.
Recall number 24V809000 · Recall details
Visibility: glass, side/rear
- What is wrong
- 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.
- Risk
- During air bag deployment, an unsecured windshield may not support the front air bags as intended, increasing the risk of injury in a crash.
- Remedy
- Dealers will inspect and replace the windshield and rear window as necessary, free of charge. Owner notification letters were mailed on August 30, 2024. Owners may contact Porsche customer service at 1‑800‑767‑7243. Porsche's number for this recall is ARA3.
Recall number 24V155000 · Recall details
Seat belts
- What is wrong
- Porsche Cars North America, Inc. (Porsche) is recalling certain 2021 911 Carrera Coupe, 911 Carrera S Coupe, 911 Carrera 4 Coupe, 911 Carrera 4S Coupe, 911 Turbo Coupe, 911 Turbo S Coupe, Panamera, Panamera 4 E-Hybrid, Panamera 4S, Panamera GTS, Panamera Turbo S, Taycan, Taycan 4S, Taycan Turbo, and Taycan Turbo S vehicles. The seat belt automatic locking retractors may deactivate early, which can prevent the child restraint system from securing properly. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
- Risk
- An unsecured child restraint system can increase the risk of injury during a crash.
- Remedy
- Dealers will inspect and replace the seat belt assemblies, as necessary, free of charge. Owner notification letters were mailed October 1, 2021. Owners may contact Porsche customer service at 1‑800‑767‑7243. Porsche's number for this recall is AMB6.
Recall number 21V608000 · Recall details
Air bags: sensor: occupant classification: front passenger
- What is wrong
- Porsche Cars North America, Inc. (Porsche) is recalling certain 2021 911 Turbo Coupe, 911 Turbo S Coupe, 911 Carrera 4S Targa, 911 Carrera 4S Cabriolet, 911 Turbo S Cabriolet, and 911 Turbo Cabriolet vehicles. Incorrect passenger seat was installed and may cause a Occupant Classification System (OCS) malfunction.
- Risk
- An OCS malfunction may affect the front passenger air bag, increasing the risk of injury.
- Remedy
- Dealers will install the correct seat, free of charge. Owner notification letters were mailed November 16, 2021. Owners may contact Porsche customer service at 1‑800‑767‑7243. Porsche's number for this recall is AMB3.
Recall number 21V467000 · Recall details
Suspension: critical fasteners
- What is wrong
- Porsche Cars North America, Inc. (Porsche) is recalling certain 2021 Porsche Taycan Turbo, Taycan Turbo S, Taycan, Taycan 4S, 911 Turbo S Coupe, Cayman, Cayman T, Cayman S, Cayman GT4, 911 Carrera Coupe, 911 Carrera S Coupe, 911 Carrera 4S Coupe, 911 Carrera 4S Targa, 911 Carrera Cabriolet, 911 Carrera S Cabriolet, 911 Carrera 4S Targa Heritage Design Edition, 911 Carrera 4S Cabriolet, 911 Turbo Coupe, 911 Turbo Cabriolet, 911 Turbo S Cabriolet, 718 Spyder, and Boxster vehicles. Certain suspension components may not have been tightened correctly and can loosen.
- Risk
- Loose suspension components may detach, causing a sudden loss of vehicle stability and control, and increasing the risk of a crash.
- Remedy
- Dealers will replace the affected suspension nuts and bolts. Dealers will also inspect surrounding components for damage, and replace any damaged parts as necessary. Repairs will be performed free of charge. Owner notification letters were mailed May 7, 2021. Owners may contact Porsche customer service at 1‑800‑767‑7243. Porsche's number for this recall is AMA3.
Recall number 21V157000 · Recall details
Technical service bulletins for the 2021 Porsche 911 676
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Technical Information for Warranty Extension for Front Door Wiring Harness related to Real Top View (RTV)...
- Warranty Information: Warranty Extension for Transmission Electronics Control Unit (18/26)
- Parts Information for Parts Withdrawal
- Parts Information for Parts Withdrawal
- Parts Information for Parts Withdrawal
- Parts Information for Parts Withdrawal
- Advanced Technical Information for Paint Thickness or Decals Affecting Corner Radar Sensor Operation
- Parts Information for Parts Withdrawal
- Technical Information for Yellow Warning Message "Rear Axle Steering Has Failed" in Instrument Cluster:...
- Technical Information for Particles/Metal Chips/Residues in Engine Oil
2021 Porsche 911 fuel economy
Official EPA estimates in miles per gallon (MPGe for electric). Ranges cover trims that share the same engine.
| Engine | Drive | City | Highway | Combined |
|---|---|---|---|---|
| 3.0L 6‑cyl | RWD | 17-18 | 23-25 | 20-21 |
| 3.0L 6‑cyl | AWD | 17-18 | 23-25 | 20 |
| 3.7L 6‑cyl | AWD | 15 | 20 | 17 |
What 2021 Porsche 911 owners say
Most recent owner complaints, unedited.
I started my car and about one minute later I heard an explosion from the rear of the vehicle and saw it engulfed in flames.
Two separate instances of fuel line failure and fuel leak in the engine compartment. The first in March 2024 and the second in September 2025. The situations both resulted in fuel leaking on top of the hot engine components. Repair requires removal of the engine and transmission. In 2024 repair time was 9 weeks, in 2025 - 3 weeks. In the first case service was covered under warranty, the second partially covered by extended warranty. Repair costs approximately $6,000 per occasion. Leaking fuel on a hot engine clearly created an unacceptable hazard. The vehicle was serviced, and the defect confirmed, at Porsche of Fort Myers (Florida) on both occasions. Evidence of the problem was identified via fuel smell only - no warning messages in the vehicle occurred.
2021 Porsche 911. Consumer writes in regards to missing computer chip for proper steering.
The seat back release on both seats is very hard to pull. On the drivers side the strap broke free while attempting to exit and the seat would not release. This could be a safety danger in a crash when rear seat occupants would not be able to exit
Compare the 2021 Porsche 911
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Questions about the 2021 Porsche 911
Is the 2021 Porsche 911 reliable?
Owners have filed 5 complaints about the 2021 Porsche 911, close to a typical 911 model year.
What is the most common problem with the 2021 Porsche 911?
Fuel and propulsion system, with 3 complaints. Next is seats (1).
How many recalls does the 2021 Porsche 911 have?
6 recalls, covering back over prevention, wheels and visibility.
What gas mileage does the 2021 Porsche 911 get?
Official estimates for the 2021 Porsche 911 range from 17 to 21 mpg combined. The most efficient version (3.0L 6-cyl, RWD) gets 17-18 city and 23-25 highway.
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