Decided to replace my injectors before I go take my 2002 WRX in for an OS tune next week. All goes well, despite the lengthy time the replacement actually consumed. After finishing it all, I turn on my car and see that I have a CEL. I pull the codes and get: p0102/p0113, do some research and it's directly linked to the god-forsaken MAF sensor. Do note that during my injector replacement, I kept the MAF (well the entire air intake assembly) in my car, and I even clean it before I put it back on. So now I am baffled and looking for your help..! Could it be the MAF wiring, because if you ever done injector replacement, the GBOD removal does require some tugging, so maybe the MAF wiring got damaged during this process? Also I took it out for a drive, because I spent a quite amount of hours replacing these injectors and want to see if I had any more problems, and for ONE drive cycle my car was vibrating unusually only at idle. Once I gave it any throttle, it went away. Been driving it the past two days, despite the ugly CEL, and vibration has gone away and car seems to be running fine, though it has a sluggish startup. ANY help would be fine. Maybe point me in the direction of how to use a multimeter on the MAF wiring, or where to purchase new MAF wiring/installation. Thanks, happy scooby'in. P.S. Installing boost gauge in two days so maybe I can make some logs on boost peak and vacuum.