OBD-II PIDs are diagnostic codes required in North American cars since 1996
PIDs are used with scan tools connected to vehicle's OBD-II connector
Scan tool sends PID to vehicle's bus, which recognizes and reports values
Modes and Functions
Ten modes defined in SAE J1979 standard, prefixed with $
Modes 1-2 show current data, 3-4 display stored trouble codes
Manufacturers can define additional modes above #9
Mode 3 returns DTC information without PID request
Technical Details
PIDs use CAN bus with functional addressing at ID 7DFh
Query uses 8 data bytes, response uses variable message IDs
Fuel type information returned as single byte
Some PIDs use bitwise encoding for specific data
Non-Standard Features
Most OBD-II PIDs are non-standard
Modern vehicles support more functions than standard PIDs
ETI provides scan code information for members
OEMs charge varying fees for scan tool access
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