The Nissan President 150 was replaced by a new 250 generation in 1973. The V8 engine had its displacement increased to 4.4litre and was now designated Y44E, and a 3.0litre version was still available. This chassis was mainly the same with a new front face grille. In 1977 the Sovereign trim was added. The President (H150) was introduced in October 1965 as a replacement for the Cedric Special. It had a choice of H30 six-cylinder and Y40 V8 engines and was very lavishly appointed for its time. The second generation (H250) was introduced in 1973 with the Y44 engine (later receiving fuel injection), and would continue until 1990.
The 250 underwent a major redesign in 1982, notable design changes are the replacement of the round headlights with square versions. Larger fuel tank, and suspension improvements. In 1985, the Sovereign VIP trim was added. Production of the 250 series continued until 1990.
In October 1989 a new Nissan President, designated JHG50, debuted during the Tokyo Motor Show, with sales beginning a year later. Concurrently, a short-wheelbase version of the chassis debuted in the USA as Infiniti Q45 or Nissan Q45 in Japan, with a different front and rear end. Both shared the new 4.5litre VH45DE V8 engine. In 1993, a short-wheelbase version similar to the Infiniti joined the lineup, badged as President JS. At the same time, Nissan's special vehicles subsidiary Autech developed a Royal Limousine model with split passenger compartment.
An interesting feature also debuted in 1993 — an airbag for the left-hand side (curbside) rear seat passenger. In 1994, along with a minor facelift, Nissan revived the Sovereign trim level (previously available for 250 Presidents) for the long-wheelbase model. Another minor facelift occurred in 1998 (designated PHG50). At the same time, the previous Infiniti Q45 was replaced by a model based on a smaller (yet still large) Nissan Cima, which was also fitted with the rear passenger airbag option in Japan. The PHG50 continued in production till 2002 with the arrival of the new F50 chassis.