What is it?
The engine is based on the existing THP 155 unit but has been upgraded in order to boost output and efficiency. This has been achieved thanks to tweaks that include increased fuel pressure, a modified turbocharger and a new stop-start system.
On paper, the net result of Citroën’s efforts look decidedly worthwhile. The outgoing THP 155 produced 154bhp and 177lb ft, while returning combined fuel economy of 47.9mpg and emitting 137g/km of CO2.
The revised THP 165, on the other hand, produces a higher 161bhp while averaging 50.4mpg and emitting a lower 129g/km of CO2. Peak torque of 177lb ft remains unchanged but is offered over a wider rev range than before, promising to improve the DS3’s driveability.
Also offered on the new DS3 is an automatic emergency city braking system, new LED and xenon headlamps and a selection of assistance and connectivity packages.