Toyota Prius and hybrid history: from the G21 project to the fifth-generation Prius

Toyota Prius and Toyota hybrids history

Toyota's first hybrid work dates to 1968, with a gas-turbine hybrid system shelved in the early 1980s for lack of suitable batteries. In 1993 Toyota launched the G21 project under Takeshi Uchiyamada to design a car for the 21st century. The first target was 1.5 times the fuel efficiency of conventional cars; R&D chief Akihiro Wada raised it to double. A hybrid concept followed at the 1995 Tokyo Motor Show.

In March 1997 Toyota announced the Toyota Hybrid System (THS), which linked an electric motor and generator through a power-split device to work as both a series and a parallel hybrid. Toyota built the motor and inverter in-house, sourced the nickel-metal hydride battery from a joint venture with Matsushita, and launched the Prius in Japan in December 1997, about two years after development officially began.

A revised Prius came to the US and Europe in 2000. In the US, Toyota launched the 2001 Prius in July 2000 with 97 combined horsepower and an EPA-estimated 41 mpg combined. Hybrid versions then spread across the lineup, and Toyota reported more than 15 million hybrids sold worldwide by January 2020.[1],[2],[3],[5],[6]

Years and production numbers

Generations and key variants

Engine and drivetrain facts

• The original Toyota Hybrid System (1997) used an integrated electric motor and generator linked by a power-split device, letting it work as a series or a parallel hybrid.
• The second-generation Prius introduced THS II, branded Hybrid Synergy Drive in the US, with a high-voltage circuit that greatly increased motor output.
• The third generation moved to a larger 1.8-liter engine. The fourth generation's redesigned, smaller hybrid components included a lithium-ion battery placed under the rear seat to free cargo space.
• The fifth generation pairs a 2.0-liter engine with Toyota's latest hybrid system, rated at up to 196 hp with all-wheel drive.
• Outside the Prius, US hybrid production began in 2006, when Toyota Motor Manufacturing Kentucky started building the Camry Hybrid.

Sources:[1],[2],[6]

What changed over the years

1. 1993G21 project begins under Takeshi Uchiyamada.
2. 1995Hybrid Prius concept shown at the Tokyo Motor Show.
3. 1997THS announced in March; Prius launched in Japan in December.
4. 2000Revised Prius launched in the US (2001 model) and Europe.
5. 2003–2004Second generation with THS II; US 2004 model year.
6. 2006Camry Hybrid production begins in Kentucky.
7. 20071 million Toyota hybrids sold worldwide.
8. 2009–2010Third-generation Prius; US hybrid sales pass 1 million.
9. 2016–2017Fourth generation on TNGA; Prius Prime arrives.
10. 2023Fifth generation on TNGA-C.

Sources:[1],[2],[5],[6],[7]

What to check before you buy one

• Confirm the generation from the VIN and model year. Body styles overlap at the changeovers, and the Prius v, Prius c and Prius Prime are separate models.
• Ask for hybrid-system service records and any hybrid battery replacement paperwork, and check whether the original hybrid warranty coverage has expired for that model year.
• On a Prius Prime, confirm the charging cable is included and that the car charges normally on both standard and Level 2 equipment.
• On AWD-e models (2019 and later), confirm the all-wheel-drive badge matches the VIN, since FWD and AWD versions look alike.
• Check open recalls by VIN before buying.

Model-specific problems by generation are tracked on our Toyota Prius known issues page. Engine guides: Toyota Hybrid System (THS), 2.0L Dynamic Force four (M20A-FKS / M20A-FXS).

Toyota Prius and Toyota hybrids prices and values

Medians of asking prices, not transaction prices; every trim is blended, so performance variants usually sit well above these medians. "Below new median" compares each model year's median used listing with the median listing price of a new 2026 Prius today. More in our Toyota Prius depreciation study.

Mileage: across 7,135 used Toyota Prius listings in our November 2026 study (all model years), the median odometer reading was 95,428 miles and 8.4% showed 200,000 miles or more. See how long a Toyota Prius lasts.

How to verify a Toyota Prius and Toyota hybrids's factory options

Prius grades, packages and plug-in versions look alike from the outside. CarWhere checks the 17-character VIN for licensed factory build data and, when it exists, lists the equipment the car was built with. It does not promise a complete option list for every VIN.

Every US Prius, from the 2001 model year on, carries a standardized 17-character VIN.[8]