Tread means walking or standing on something. Treading in a particular way means walking that way. Treading on someone means walking on them. Treading warily means walking cautiously in relationships
OBD-II is mandatory for all US vehicles since 1996. Diesel vehicles required OBD support in 2004. Connector located on driver's side near center console
Torque measures force needed to rotate an object. Torque equals force multiplied by distance from rotation axis. 1 NM equals approximately 0.738 pound-feet
O/D stands for Overdrive, a transmission feature from mid-1980s to mid-2010s. It's usually on by default and prevents using highest gears. The button is typically located on the gearshift
OBD standard was initially developed by CARB to control vehicle emissions. OBDII arrived in US in 1996, EOBD for European vehicles in 2000. EURO3 directive required emission failure indicators and code recording
OBD2 is a self-diagnostic system in modern vehicles. System consists of ECU, sensors, and indicator lights. ECU generates diagnostic trouble codes for external scanners