13. Alfa Romeo 166
The Alfa Romeo 166, produced from 1998 to 2007, was Alfa’s flagship model, featuring complex variable valve timing engines, unique electronics, and a drive-by-wire throttle system. (media.stellantis.com) While these innovations offered impressive performance, they also introduced maintenance challenges. Common issues included timing variator failures leading to loud engine noises, (breakeryard.com) throttle body malfunctions causing erratic idling, (autoguru.com.au) and electrical problems affecting various systems. (curbsideclassic.com) These complexities made the 166 a charming yet demanding vehicle to maintain.