The G20 was Infiniti's entry level luxury sedan during most of the 1990s. It shared it's platform with Nissan's Sentra economy sedan and 200SX coupe', although the infiniti was far more refined and had a vastly superior interior. It was Known as the Primera in Europe and Japan and was sold with only one motor, the SR20DE 2.0 litre Inline 4-Cylinder, also shared with the Nissan badged models. The engine produced only 140 horsepower (104 kW), but became extremely popular among "tuners" who liked it for its flexibility, reliability, fuel economy and high power-handling capabilities. Thanks to this and their low buy-in cost, used SR20 powered Sentras, 200SXs and G20s have become popular and prominant in the tuner sub-culture.

Two variations of the G20 exist, the P10 built from 1991 to 1996 and the P11 built from 1999 to 2002. All G20's were built in Oppama , Japan. The first 1991 G20 was completed on July 10, 1991. The final 1996 G20 was completed on July 19, 1996. They are virtually identicle to one another, with the only prominant differences being limited to styling revisions. The first 2nd generation 1999 G20 was completed on May 18, 1998. The final 2nd generation 2002 G20 was completed on January 11, 2002. The G20 was discontinued in favor of the rear wheel drive G35, which is vastly more competant, but is priced more than $10,000 USD above the MSRP of the last G20s.