In September 2003, the 166 was substantially revised, being unveiled at the Frankfurt Motor Show.
As well as upgrades to the chassis, interior, and the engine range, the styling was substantially altered.
The new front end resembled the also recently revised 156.

The 2.0-litre V6 Turbo model was dropped because of marketing problems, the V6 2.5 was re rated at 188 PS (138 kW; 185 hp) and a 3.2 litre V6 (240 PS) was introduced.
Both the new 3.2 litre and the 2.0 Twin Spark models now featured the six speed manual gearbox, whilst the 3.0 model was retained, but made available only in Sportronic form.

The L5 2.4 was re engineered with Multi-Jet technology which allows up to five injections per cycle, second stage common rail, with maximum injection pressure of 1400 bar and four valves per cylinder, to output a class-leading 175 PS (129 kW; 173 hp).
In September 2003, the 166 was substantially revised, being unveiled at the Frankfurt Motor Show. As well as upgrades to the chassis, interior, and the engine range, the styling was substantially altered. The new front end resembled the also recently revised 156.
The 2.0-litre V6 Turbo model was dropped because of marketing problems, the V6 2.5 was re rated at 188 PS (138 kW; 185 hp) and a 3.2 litre V6 (240 PS) was introduced. Both the new 3.2 litre and the 2.0 Twin Spark models now featured the six speed manual gearbox, whilst the 3.0 model was retained, but made available only in Sportronic form.
The L5 2.4 was re engineered with Multi-Jet technology which allows up to five injections per cycle, second stage common rail, with maximum injection pressure of 1400 bar and four valves per cylinder, to output a class-leading 175 PS (129 kW; 173 hp).
Alfa Romeo 166