Or, if you want something to easily carry in the car, then Creator310 or 410, or Autophix 5900 or 7910 will suit your needs.
All do the same job but I believe the Creator requires you to individually select and scan each module, whereas Autophix has the added facility to do a full system scan. The 7910 is more expensive but does a few extra functions. If you are only looking at a basic level then the 5900 will suffice.
These are both code readers.
If you want to do coding yourself then the aforementioned INPA, WinKFP, NCS Expert, Tool32 suite for a laptop, or a Scanner 1.4 for a laptop.