The Lemon Index
Porsche's 3.7 L twin-turbo flat-6 in the 911 Turbo / GT3, model years 2021–2025. YouTube likes the 2022 best.
A safer bet: YouTube owner tone 63/100, #1 of 165 engines with a YouTube study (in the top third); no engine-related recall on record, 2 known issues listed below.
Reliability by year
Not enough complaints to chart. We found no government complaints we can tie to this engine's cars. Supercars sell in small numbers, so we show YouTube, recalls and the automaker's repair notes instead.
Why the car page shows more: the 911 Carrera page counts 42 complaints and 15 recall campaigns for 2017–2025, everything NHTSA files as "911", other engines included. This page counts only the 0 complaints and 1 recall we can tie to the Porsche 9A2 Evo 3.7 by model name or the owner's own words.
YouTube videos are most positive about the 2022 (71) and least about the 2021 (57); neighboring years share many of the same videos, so small gaps mean little.
How we count: owner complaints only where the car's name and year leave no doubt; YouTube tone from videos that name this engine or its cars. How we count
Owner complaints (NHTSA) are filed by model and year, not engine. We count one for this engine only when the model name and year had no other engine (e.g. "488 GTB", "GT-R"), or when the owner's own words name a version that had only this engine that year (Z06, ZR1, Hellcat, GT500 ...). They cover the whole car (wheels, air bags, electrics ...), not only the engine, and none of them is a failure rate. We chart them only for engines with 30 or more, over 3 or more years. YouTube tone = how positive the videos are, 0–100, from titles and transcripts (praise vs trouble words, the title counts 3 times), weighted by views; a year needs at least 3 videos' worth. A video counts for this engine when its title names the engine or a car that only had this engine in the years it names; a video whose title names no model year counts toward every year of that car, so neighboring years share most of their videos.
All the numbers, year by year
| Year | Cars | Owner complaints | YouTube says | Recalls |
|---|---|---|---|---|
| 2021 | 911 Turbo / GT3 | 0 | 57 (22 videos) | 1 |
| 2022 | 911 Turbo / GT3 | 0 | 71 (19 videos) | 0 |
| 2023 | 911 Turbo / GT3 | 0 | 65 (18 videos) | 0 |
| 2024 | 911 Turbo / GT3 | 0 | 60 (22 videos) | 0 |
| 2025 | 911 Turbo / GT3 | 0 | 61 (19 videos) | 0 |
Recalls on cars with this engine 1
None of them is about the engine itself.
23V715000 Air Bags · Porsche 911 Turbo / GT3 2021
NHTSA recalls by model and year. A recall counts here when every confirmed version of that model-year had this engine, or the recall names it. Check a car's VIN for its own open recalls.
Engine problems Porsche told dealers about
Porsche sent dealers 102 repair notes about the engine on these cars, including:
- Instructions on advanced technical information for DME fault P310B00 - fuel low pressure
- Technical information for the malfunction indicator light active in instrument cluster, DME fault memory…
- Installation and conversion instructions for the sport exhaust on the 911 Turbo and Turbo S
NHTSA manufacturer communications (technical service bulletins), matched by model name and year like the complaints, engine-related ones only. A repair note is not a recall: ask a seller whether it was done.
Known issues on record
- No widespread pattern (Owner-reported). Renndriver reports no widespread engine problems on the 991.2 or the 992.
- Oil use on early 2017 cars (Owner-reported). REREV says some early 2017 engines used up to a quart per 1,000 miles and some got new engines under warranty. Renndriver does not report it. 1 owner complaint to NHTSA mention it (992 911 Carrera).
- Turbo coolant line leaks (Owner-reported). REREV says coolant lines to the turbos on early 991.2 cars could leak at the fittings and Porsche updated the lines.
Sources: Renndriver: Porsche 911 common problems by generation, REREV: best and worst Porsche 991 years. The same list as on the 911 Carrera page.
Every US version with this engine
| Car and versions | Years |
|---|---|
| Porsche 911 Turbo / GT3 911 Turbo, 911 Turbo Cabriolet, 911 Turbo S, 911 Turbo S Cabriolet | 2021–25 |
Engine code: 9A2 Evo (MDB.CB). Power: 572–641 hp, factory figures. Versions and years: EPA (fueleconomy.gov). Sources: Porsche 911 (992) · Corazón y alma (Porsche Newsroom).
Quick answers
What cars have the Porsche 9A2 Evo 3.7 engine?
In the US: the Porsche 911 Turbo / GT3, model years 2021–2025. See the version table for each one.
Is the Porsche 9A2 Evo 3.7 reliable?
Mostly yes. YouTube owner tone 63/100, #1 of 165 engines with a YouTube study (in the top third); no engine-related recall on record, 2 known issues listed below. Not enough owner complaints to judge it per car: supercars sell in small numbers. Its cars had 1 recalls (0 about the engine, fuel or powertrain). Have any used car inspected.
How much horsepower does the Porsche 9A2 Evo 3.7 make?
572–641 hp in factory figures, depending on the car.