I haven't checked for a code, but I cleaned out the AMS, took the negative off the battery for 15 seconds, and put it back on. Then i started the car, and let it run while I checked and adjusted the tire air pressure. The engine was definitely running smoother. The transmission wasn't acting up, or shifting hard either when I took it for a drive. The engine felt like it had a lot more power.
As for OBD2, I have the part under the dash, but I don't have a reader. Can one read the codes from the engine on OBD2, Arthur??
I don't need the mercedes specific one. Looking through waxed paper works for me for now....
I was looking at maybe buying the star diagnostic system from a guy in quebec for $700. Didn't include the laptop though....