I need someone to talk to me like a 10 year old to help with this code. I have been doing some research about VADIS and after market OBDII readers and am absolutely confused.

In short, I have a 2007 S80, 3.2 liter, 55k miles. I had just went on a 1,000 trip without any issues. When I get back home, the next morning the darn check engine light pops on when I'm on the way to work. No change in performance. I ignore it for a few days hoping it will just pop off. Once it didn't turn off, I took it to a local parts store to use their reader and it could register every other Volvo except an S80. I jimmied around and basicly erased the code. I then took it up to wash it and turned it off while I washed it. Turned the car back on and the darn light was back. The code that was read is P0171 - bank 1 too lean.

I want to either buy an OBDII that I can trust can read the codes and give me some real time data or try and figure out how to use this VADIS system. I also do't know the difference between VADIS and VIDA DICE which I found on E-Bay. I have an old laptop with Windows XP and a newer laptop with Windows 7 home 64 bit.

I just need someone to walk me through to try and figure out what system I should get so I can try and figure this code out so I don't have to go to the stealership. I plan to have this car for an extended period of time. Thanks!