Firstly, OBD-II is an upgrade, from the original system, in earlier vehicles.

So, with advancements in technology, came improvements, and the second generation system OBD-II was introduced. Consequently, they all use, a standardized digital communications port. And, that port provides, real-time data. And, that gives you, much faster diagnostics of a vehicle’s problem.

OBD-II - Second Generation, On-Board Diagnostics Codes
OBD-II – Second Generation, On-Board Diagnostics Codes

Choose Your Help Topic Below


P0001 Through P0099 – Trouble Codes, Fuel And Air Metering

P0100 Through P0199 – Trouble Codes, Fuel And Air Metering

P0200 Through P0299 – Fuel And Air Metering (Injector Circuit)

P0300 Through P0399 – Ignition System Or Engine Misfire

P0400 Through P0499 – Auxiliary Emissions Controls

P0500 Through P0599 – Vehicle Speed And Idle Control System


Diesel Engine, Common Check Engine Light OBD-II, Diagnostic Trouble Codes


P0008 Through U1601 – Dodge Cummins Diagnostic Trouble Codes

P0100 Through P0804 – Chev/GM Duramax, Diagnostic Trouble Codes

P1111 Through P1783 – Ford Power Stroke, Diagnostic Trouble Codes

OBD Engine Codes And Warning Lights, Are Only A Messenger

Check Engine Light (CEL) – What Can Cause It To Come On

Dash Warning Lights Only Provide A Warning, Something Is Wrong

Reduced Engine Power Warning Light – What To Do And Why?


BY DANNY BENDER