The mapping for the car is contained in the ECM (all Volvo electronics boxes are 'Modules' so ECM rather than ECU!). Depending on which year/engine/emissions standard it will either be near the battery or in the front of the left wheelarch (wheel off and remove liner, and there's a ECU box in there).
Remapping to get rid of smoke is surely just covering up the problem, wouldn't it be better to simply fix the fault that is causing it to smoke?
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