I just recently bought a 2004 WRX STI and i love it! On the other hand though im having quite a few problems out of it. The o2 sensor is out which i know how to replace that but i have several lights on my dash on right now. There is the DCCD light i have no idea what that is, and the lights right beside that which says AUTO with a bunch of arrows below that, and my REAR DIFF TEMP light is on. Any information that any of you have would be most helpful. I am also sorry if some or most of these issues are discussed in the forums, i just dont really have the time to look these problems up because im in the military. Oh and also i cannot turn off my cruise control the light on the dash constantly blinks. One more question when im going 55 mph and up and i down shift from 6th to 5th and down to 4th gear 4 makes a slight grinding noise, im thinking its the synchronizer going out. BTW what kind of oil are you running in the power train? Thank you for your time in answering my questions it is much appreciated!