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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 600 · 17971–18000 shown
P0722
Output shaft speed (OSS) sensor - no signal

11 reference families · BMW, Ford, Acura / Honda, ISUZU, Mercedes-Benz, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, GAC / Lexus / Toyota, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

P0724
Brake switch B - circuit high

9 reference families · BMW, Ford, Mercedes-Benz, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, GAC / Lexus / Toyota, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

P0725
Engine RPM input - circuit malfunction

11 reference families · BMW, Ford, Acura / Honda, Mercedes-Benz, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, Dacia / Renault, GAC / Lexus / Toyota, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

P0726
Engine RPM input - range/performance problem

9 reference families · BMW, Ford, Mercedes-Benz, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, GAC / Lexus / Toyota, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

P0727
Engine RPM input - no signal

9 reference families · BMW, Ford, Mercedes-Benz, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, GAC / Lexus / Toyota, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

P0728
Engine RPM input - circuit intermittent

9 reference families · BMW, Ford, Mercedes-Benz, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, GAC / Lexus / Toyota, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

P0730
Incorrect gear ratio

10 reference families · BMW, Ford, Acura / Honda, Mercedes-Benz, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, GAC / Lexus / Toyota, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

P0731
Gear 1 - incorrect ratio

10 reference families · BMW, Ford, Acura / Honda, Mercedes-Benz, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, GAC / Lexus / Toyota, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

P0732
Gear 2 - incorrect ratio

10 reference families · BMW, Ford, Acura / Honda, Mercedes-Benz, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, GAC / Lexus / Toyota, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

P0733
Gear 3 - incorrect ratio

10 reference families · BMW, Ford, Acura / Honda, Mercedes-Benz, Dodge / Mitsubishi, Infiniti / Nissan, Generic OBD2, Belgee / Geely / Proton, GAC / Lexus / Toyota, Audi / Jetta / MAN / Seat / Skoda / Volkswagen

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