See also:

Optimal sound reproduction
The audio system is pre-calibrated for optimal sound reproduction using digital signal processing. This calibration takes into account factors such as the speakers, amplifier, cabin acoustics, th ...

Driving Dynamics: Engines
The Volvo S40 is available with a range of high-tech engines that reflect its role as a premium alternative. Three new engines joined the range in 2007: a 145 PS 2.0-litre petrol, a five-cylinder ...

Three-way catalytic converter
Keep your engine properly tuned. Certain engine malfunctions, particularly involving the electrical, fuel or distributor ignition systems, may cause unusually high threeway catalytic converte ...