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Diagnostic comparisons

Compare OBD codes and concepts

P0420 vs P0430

Upstream vs downstream O2 sensor

Bank 1 vs Bank 2

OBD1 vs OBD2: scope

Diagnostic knowledge search

23,879 code identifiers with scoped meanings, and 54,261 enhanced signal definitions. No VIN or personal information is needed.

Diagnostic explainers

Pending, stored and permanent codes · Enhanced PIDs and Mode 22

78,140 matches

Page 746 · 22351–22380 shown
U0073
Control module - data bus Off

8 reference families · BMW, Changan, GM, Euler / Great Wall / Harvard / Haval, Acura / Honda, Mercedes-Benz, Generic OBD2, Belgee / Geely / Proton

OBD Lens reference library · catalog legacy-owner-2026-11-02-v84-evidence. Sources and scope