My own car 2010 S40 had the problem. This video shows how I fix the problem.
The link of the video I mentioned in the video: https://www.youtube.com/watch?v=o5tDcABsUW8
The obdII scanner: https://www.amazon.com/gp/product/B005NLQAHS/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1
The title on amazon website mentioned it is only for android phone.
The app for clear code: obd car doctor free version. Car scanner (app) is used to read code.
Warning: it is your own risk if you try to fix the car by yourself.
It is only for DIY with some basic knowledge.
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Very good video thanks you saved me a lots money I have V70 /S70 After changing ignation coils everything worked fine . I did spark plugs ngk works great thanks for the help you are the best.
hi MR. MY VOLVO S40 T4 IS CRAKING BUT IS NOT PEAK UP