The S 40 came with different size and spec engines and they were not all Turbo charged versions. The choice of engines available depends on which country you are in.
The turbocharger is driven by the engine's exhaust system and runs continuously but has minimal affect at low engine RPM. Unless the turbo has failed, you should feel the turbo effect kick in when you accelerate hard but there will be a brief lag .
If you have the turbo engine fitted to your 2002 model S40 you will have a " 1.9T " badge on the rear of your car under the S40 badge. The "T" designates Turbo. An engine designator badge without a "T" indicates it is not turbocharged.
The turbochargers on these S40 models will fail (especially if the car has done a lot of miles) so you should have your car examined if you feel the turbo is not functioning.
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