OBD-II Diagnostic Trouble Codes (DTC) has four basic code categories:
P - Powertrain C - Chassis B - Body U - Future Diagnotic Systems
A breakdown of these categories:
P0100-P0299 - Fuel and Air Metering, Injector Circuit
P0300-P0399 - Ignition System or Misfire P0400-P0499 - Auxiliary Emissions Controls
P0500-P0599 - Speed Controls and Idle Control System P0600-P0699 - Computer Output Circuit
P0700-P0899 - Transmission P1000-P1999 - Codes Specific to Ford vehicles
B1200-B2999 - Body C0000-C0999 - Chassis U0000-U0999 - Network Codes
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The Federalists Papers, Number 57, written by James Madison:
....... in the situation of the House of Representatives, restraining them from oppressive measures, that they can make no law which will not have its full operation on themselves and their friends, as well as on the great mass of the society. This has always been deemed one of the strongest bonds by which human policy can connect the rulers and the people together. It creates between them that communion of interests and sympathy of sentiments of which few governments have furnished examples; but without which every government degenerates into tyranny.