The original Senator and Monza were facelifted in November 1982, although the Senator "A2" (as it is usually called) only went on sale in March 1983.
In the United Kingdom, it was initially sold only as an Opel, before being rebadged as a Vauxhall in 1984.
The A2 Monza was only sold as an Opel.

The facelifted car looked similar to its predecessor, with relatively minor changes: smoothed-off headlights increased in size, and chrome parts were changed to a matt black or colour coded finish.
The car was much more slippery, with drag resistance down (from 0.45 to 0.36 ).
The top of the range 3.0E received upgraded Bosch LE-Jetronic fuel injection.

Interiors were improved, and engines changed.
Now, the fuel-injected straight-four 110 PS (81 kW) two-liter cam-in-head unit from the Rekord E2 was available, although with little fanfare; this and the 2.5 essentially replaced the Commodore which was itself quietly retired in 1982.
Power of the 2.0 was soon increased to 115 PS (85 kW).
In March 1983 a 2.3-litre turbodiesel (shared with the Rekord) became available, and a few months later ABS-brakes (hitherto only available for the Senator CD) became an available option across the entire Senator/Monza range.
At the Paris Show in September 1984 the 2.5E was given a new LE-Jetronic Bosch fuel injection system; power inched up to 140 PS (100 kW).
The 2.0E was replaced by the torquier 2.2E, still with the same max power.
Only the 3.0E engine remained untouched, although its name was changed to 3.0i.
On the transmission side, the Strasbourg-built THM180 three-speed automatic was replaced by a four-speed unit.
The trim surrounding the windows was more blacked out than before as well, although ample chrome remained.

Shortly thereafter, in November 1984 a supercharged version (Comprex) was shown - at the time, the only production car in the world to use this technique.
Going on sale in 1985, this very rare experimental version (1,000 units planned) were officially built by Irmscher rather than Opel.
The Comprex offered 95 PS (70 kW) and a 172 km/h (107 mph) top speed, and acceleration figures showed a twelve percent improvement over the turbodiesel.
Like the other Rekord and Senator diesels it had a pronounced bulge in the bonnet.
The Comprex offered marginally higher power power than the turbodiesel, but more importantly, 90 percent of the maximum torque was available from 1300 rpm.
From September 1985 until the end of production in the end of summer 1986, a catalyzed version of the 3.0E was available, with power down to 156 PS (115 kW).
The original Senator and Monza were facelifted in November 1982, although the Senator "A2" (as it is usually called) only went on sale in March 1983. In the United Kingdom, it was initially sold only as an Opel, before being rebadged as a Vauxhall in 1984. The A2 Monza was only sold as an Opel.
The facelifted car looked similar to its predecessor, with relatively minor changes: smoothed-off headlights increased in size, and chrome parts were changed to a matt black or colour coded finish. The car was much more slippery, with drag resistance down (from 0.45 to 0.36 ). The top of the range 3.0E received upgraded Bosch LE-Jetronic fuel injection.
Interiors were improved, and engines changed. Now, the fuel-injected straight-four 110 PS (81 kW) two-liter cam-in-head unit from the Rekord E2 was available, although with little fanfare; this and the 2.5 essentially replaced the Commodore which was itself quietly retired in 1982. Power of the 2.0 was soon increased to 115 PS (85 kW). In March 1983 a 2.3-litre turbodiesel (shared with the Rekord) became available, and a few months later ABS-brakes (hitherto only available for the Senator CD) became an available option across the entire Senator/Monza range. At the Paris Show in September 1984 the 2.5E was given a new LE-Jetronic Bosch fuel injection system; power inched up to 140 PS (100 kW). The 2.0E was replaced by the torquier 2.2E, still with the same max power. Only the 3.0E engine remained untouched, although its name was changed to 3.0i. On the transmission side, the Strasbourg-built THM180 three-speed automatic was replaced by a four-speed unit. The trim surrounding the windows was more blacked out than before as well, although ample chrome remained.
Shortly thereafter, in November 1984 a supercharged version (Comprex) was shown - at the time, the only production car in the world to use this technique. Going on sale in 1985, this very rare experimental version (1,000 units planned) were officially built by Irmscher rather than Opel. The Comprex offered 95 PS (70 kW) and a 172 km/h (107 mph) top speed, and acceleration figures showed a twelve percent improvement over the turbodiesel. Like the other Rekord and Senator diesels it had a pronounced bulge in the bonnet. The Comprex offered marginally higher power power than the turbodiesel, but more importantly, 90 percent of the maximum torque was available from 1300 rpm. From September 1985 until the end of production in the end of summer 1986, a catalyzed version of the 3.0E was available, with power down to 156 PS (115 kW).
Opel Senator