Used Tesla Model 3 with FSD: HW3 or AI4, the 2024 Highland catch, and what to check before you pay

Model 3 by year: what changed for FSD buyers

Tesla's own FSD support page says that specific features "may vary depending on your vehicle configuration, hardware, software version, region, model, vehicle trim and model year" (Tesla, July 14, 2026 capture, the newest readable copy). The table covers US cars. Model year and build date are not the same thing, and changeovers happened car by car, so use the table to shortlist and the screen to decide.

Sources: Electrek, August 9, 2017 (the article does not say whether the very first cars of July 2017 had HW2.0 or HW2.5); TechCrunch, April 22, 2019 (the Model 3 switch, and the S and X switch about a month earlier); Tesla's Tesla Vision support page (December 2023 capture: radar removal from Model 3 and Model Y began in 2021; the early October 2022 ultrasonic date); Wikipedia, Tesla Model 3 (radar eliminated April 2021, Highland announced September 1, 2023, North American orders January 10, 2024, Model 3 Standard October 2025); Reuters via KSL, January 12, 2024 (the restyled Model 3 reached North America that week); Motor1, October 7, 2025 (Model 3 Standard); Electrek, January 23, 2026. The price column is Tesla's list price by date from Not a Tesla App's price history: it shows what FSD cost while that model year was on sale, not what any particular owner paid, and it is not what the FSD is worth today (see what FSD adds to a used Tesla's value). The "AI4 (reported)" cells are our decoder's reading and press reports; Tesla has not published a spec sheet we could read.

Two practical notes from the table. Tesla's page on removing ultrasonic sensors said that vehicles without them would be delivered with Autopark, Summon and Smart Summon "coming soon" until software restored them. Those are FSD-package features, so on a Model 3 built from October 2022, ask the seller to show them working. And a 2017 to 2019 car that Tesla sold with FSD may already have had its computer swapped to HW3 at no charge; the screen shows which (see below).

The 2024 Model 3: Highland or old body?

Wikipedia says cars with the Highland changes were delivered "beginning in October 2023 (most markets) or January 2024 (US market)". Reuters reported that Tesla rolled out the restyled Model 3 in North America in the week of January 10, 2024, at $38,990 for rear-wheel drive and $45,990 for Long Range, and removed the Performance version from its North American sites. So a US buyer could only get an old-body Model 3 until then, and we treat some of those cars as 2024 models. We found no Tesla statement that gives the exact VIN or build date where the US changeover happened, which is why the answer for 2024 is "either".

That is how FSD Radar treats it: the free Tesla VIN decoder and our verdict engine name HW3 for 2020 to 2023 Model 3, AI4 for 2025 and later, and "HW3 or AI4" for 2024 and "HW2.5 or HW3" for 2019, with a note to read the car's screen. Things to look at on a 2024 car:

1. The screen (decides it). Read the Autopilot computer line, or ask the seller for a photo of it.
2. The body. Wikipedia lists the refresh's changes as new headlights and taillights, a steering wheel with no turn-signal or gear stalks (the stalk returned for the 2026 model year, per Wikipedia), an 8-inch rear-seat touchscreen and interior accent lighting. Not a Tesla App (August 8, 2024) says "the updated 2024 Model 3 has HW4, but if you have a 2017-2023 Model 3, you'll have Hardware 3". So a "2024" in the listing whose photos show the older body is probably an HW3 car. We found no source that tests that case on a specific car, so confirm it on the screen.
3. What was rumored. Before launch, Drive Tesla Canada (August 23, 2023) relayed an unconfirmed claim that the refresh might get a cut-down "HW 3.5" computer. Wikipedia and Not a Tesla App say the refreshed car came with HW4, and we found no later report of a cut-down computer, but we also found no Tesla page that states it. The screen settles this too.

HW3 or AI4: how to check, and what each runs

1. The screen (best). Tesla's own instruction is to select Controls > Software and confirm the computer type, then press Additional Vehicle Information (Tesla, AI computer page, May 14, 2026 capture). Not a Tesla App (its hardware guide) says this line was added in software 2024.38, so a very old software version may not show it. Ask for a photo of that screen before you travel.
2. The cameras. That guide reports that AI4 cars have red-tinted camera lenses, a higher-resolution front sensor (2896 x 1876 against 1280 x 960 on HW3) and one fewer front camera. It is a quick look at the viewing, not a substitute for the screen.
3. Year, body and build date. Good for shortlisting. A 2020 to 2023 Model 3 has HW3 and a 2025 or later one AI4; for a 2024 use the previous section.

What that means in November 2026: AI4 cars run Tesla's main FSD (Supervised) branch, v14.3 as of September 2026. HW3 cars got "v14 Lite" from June 29, 2026, which Tesla describes as the intelligence of the HW4 version "distilled" into HW3, first for early-access drivers and then more widely (Electrek, June 29, 2026). Not a Tesla App's list of what Lite misses includes Mad Max mode, the standalone Self-Driving app and recent Smart Summon upgrades, while it adds starting FSD from Park and Arrival Options (Not a Tesla App, June 29, 2026). Tesla has said HW3 cannot do unsupervised driving, and no HW3 upgrade has a price or date; the dated statements are in Can a Tesla with HW3 be upgraded to AI4?. The full comparison is in HW3 vs HW4 (AI4). Test-drive the version you are buying: Lite is the product on an HW3 Model 3 today.

What you can and cannot assume about FSD on a Model 3

• Owned or subscribed is not visible from outside. Tesla's rule for resale: "If the previous owner purchased FSD (Supervised) outright and did not transfer it to a new vehicle, you will receive the vehicle with FSD (Supervised)." But "If the previous owner subscribed to FSD (Supervised), you will need to subscribe using your own Tesla Account." A photo of the Software screen shows FSD, not which kind. See FSD subscription vs purchased.
• Moved cars have lost it. Tesla's page says "The Full Self-Driving (Supervised) Transfer Program ended on March 31, 2026." A seller who moved FSD to a newer Tesla before then no longer has it on this car. We found no report of the program returning through early November 2026. See Does FSD transfer to a new owner?
• 2017 to 2019 cars. Tesla's AI computer page says that if you purchased FSD and have computer 2.0 or 2.5, you are eligible for a complimentary upgrade to computer 3.0. For a subscriber it is not free: $1,000 plus tax on Tesla's US page and $1,500 plus tax on its Canadian page (May 2026 captures). The page does not say whether the free upgrade follows the car to a second owner, so ask for proof it was done. Details are in Can you add FSD to a used Tesla?
• A 2024 or 2025 Model 3 can carry owned FSD. FSD was an $8,000 purchase from April 2024 until February 14, 2026, so a first owner may have bought it. Tesla's Model 3 Standard is the long shot: Motor1 reported Tesla expected its first deliveries in December 2025 or January 2026, so only a first owner who bought the $8,000 FSD before February 14, 2026 can have left one with owned FSD.
• A 2026 Model 3 bought new with no FSD. Tesla removed Autosteer from new Model 3 and Model Y orders in January 2026, so they ship with Traffic-Aware Cruise Control only (Electrek). The change applies to new orders, not to cars already owned. A used car like this is a subscription case.
• A trial can look like FSD. Tesla's page says new Model 3 owners get a trial of FSD (Supervised) at delivery, and the gift card is a single month. A trial leaves on its own date. See Tesla CPO cars and FSD.
• Enhanced Autopilot is not FSD. Some Model 3s were sold with Enhanced Autopilot only; see Enhanced Autopilot vs FSD.
• You cannot add owned FSD later. A Model 3 without it can subscribe, but Tesla's support page says FSD (Supervised) "is not available for outright purchase and is only available as a subscription."

This guide is about US cars. Other markets got the refresh and their own prices on other dates, and Canada's HW2.5 upgrade price differs, so confirm anything that matters with Tesla for your country.

Tesla's own used Model 3s and FSD

FSD Radar studied Tesla's archived used-inventory data from 2020 to 2025 (the method and caveats are in Tesla CPO cars and FSD). It covers Tesla's own resale stock only, not private sellers or other dealers, so it says nothing direct about the open market.

Most captures are the first page of results sorted cheapest first, and the 2025 pages were price-limited, so they lean toward cheaper, older cars. Limiting it to model years 2018 to 2021 shows the same fall (99% in 2021 captures, 7% in 2023, none in 2025), so it is not only a change in the mix. Tesla's own FSD filter still found 58 used Model 3s nationally on February 27, 2025; all were model years 2018 to 2023, so none of them was a 2024 or later car. The takeaway for a Model 3 buyer: a used Model 3 bought from Tesla's inventory has usually been sold without owned FSD, so the cars worth hunting are at private sellers and independent dealers (where to find a used Tesla with FSD).

A checklist for the Model 3 in front of you

1. Software screen. Controls > Software should list "Full Self Driving Capability" in the included package, and a "Full Self-Driving (Supervised) Software" line (Tesla's own check). Get a photo from the seller before you travel and look at it yourself at the viewing.
2. Computer line. Read "Autopilot computer" in Additional Vehicle Information, not the listing. On a 2024 car this is the only answer that counts; on a 2017 to 2019 car it shows whether the HW3 upgrade was done.
3. Purchase proof. Ask for the order or invoice showing the FSD line, or a screenshot of the seller's Tesla app Upgrades page. A subscription shows as a subscription in the app; see how to check a Tesla for FSD.
4. Whether it ever moved. Ask if FSD was transferred to another Tesla before the program ended on March 31, 2026. Cars that had it moved away no longer hold it.
5. Ultrasonic sensors. On a car built from October 2022, ask to see Autopark and Summon working.
6. FSD suspension. Tesla says FSD (Supervised) can be suspended for a week after three or five strikeouts for inattention, depending on vehicle configuration, and that Controls > Self-Driving shows remaining strikeouts. Open that screen and ask about it.
7. Drive it. Engage FSD (Supervised) on a route you know, at the seller's, with them present. On a 2024 car, note whether it feels like Lite or the main version.
8. Run the VIN. The free Tesla VIN decoder reads year and factory and gives a likely HW3 or AI4 estimate; what a VIN can and cannot prove about FSD explains the limits.
9. Pay for what it does. Price the premium with the break-even rule and do not pay extra for unsupervised driving: in October 2026 a Tesla executive said they suspect around Q2 2027 for the first customer cars, in select areas (Will a used Tesla get unsupervised FSD?).

More questions to put to the seller are in questions to ask a Tesla seller about FSD. If the cars you are comparing include a Model Y, its year-by-year table is in Used Tesla Model Y with FSD.

FSD Radar is independent and not affiliated with Tesla, Inc. Facts in this guide are dated where they change often; we re-check Tesla's support pages regularly. Spotted something out of date? Email info@fsdradar.com.