Does a lot. Heef...

Does a lot. Found my problem within 20 minutes. Instead of the generic codes you get on the cheaper ODBII readers. Do really like the smooth running feature, could see that injectors 1 and 4 were leaking. Very boosted injector cleaner through the system and everything is now within parameters. Was -600 on cylinder 1 and -300 on cylinder 4. Now all cylinders around +60, runs like a charm, now just replace broken NoX sensor and done.