I have one of those early Innovas too. It is a good unit and fine for our 98 E320 and probably all W210s. But, for more recent cars (2003 & on) it seems we need a unit that can handle Can-bus and has the protocols for the car in question. At one time bought an Autel and had to return it because it caused odometer to jump 800km when I plugged it in on our smart car!I have two OBD II readers. One is a 17-year-old Innova.
First, be sure you have an OBD-II port. It was a standard for the US market in 1996, but that didn't expand around the globe until some years later.I would like to know more of this...an OBII reader is one of the remaining tools I have yet to purchase for diagnosis.
Does more expensive necessarily mean better? My father has a BAUM one that I understand was $1000+ and with that he handles his 140, 97 C230, and his volkswagen beetle... he has the "mushroom" also compatible with my 210.
Do different softwares read more? or is it a hardware issue that leads mechanics to reveal more...
I wouldn't mind spending $20 if its worth it.
I have an early ELM interface. It works with Digimoto software it came with (as well as any other Elm-ISO compatible programs) on laptop or PocketPC. I rarely ever use it (have Innovo). Only time I actually used it usefully, was for O2 sensor comparison. I had a CE light (O2 sensor code), but Elm said sensor were working properly (after I cleaned connections!).ELM327 Bluetooth OBD2 EOBD CAN-BUS Scanner Tool
Use with Torque on an Android device - perfect!
Torque — OBD2 Performance and Diagnostics for your Vehicle
Update: Appears to be sold out. USB version still available for $9.99
ELM327 USB CAN-BUS Auto Scanner