Gen4 OS Tuning Knowledge - 2 calibration entries

These 2 entries document the Gen4 OS: what the log shows, how the parser reads it, and what tuners changed in response. The largest bodies of evidence are O2 sensor closed-loop switching voltage reference, and O2 sensor rich/lean switching-voltage table reference. This page shows aggregate counts only; individual KB rows, source details, and tuning findings remain available inside the signed-in app.