Hello, all. A few weeks ago I turbocharged my 2002 Silverado 2500hd. I paid to have it tuned, as I have no tuning experience. That?s the last time I do that. The truck runs pretty decent, but it definitely has a few hiccups in the tune. I have gotten a few check engine lights, once it went away after a day, and once I cleared it a day later. The codes are something like, o2 sensor heater circuit voltage high, and one for maf sensor circuit voltage. The maf and o2s were turned off in the tune. What could be causing this? Thanks in advance, I plan on buying hp tuners very shortly and learning a little bit of tuning, but for now I?m stuck reading.