Browse the most common OBD-II diagnostic trouble codes and what they mean
Click any code to learn causes, symptoms, and solutions
Below Threshold (Bank 1)
Moderate SeverityCylinder Misfire Detected
High SeverityBank 1 Running Lean
Moderate SeverityBelow Regulation Temperature
Low SeveritySmall Leak Detected
Low SeverityLarge Leak Detected
Moderate SeverityExhaust Gas Recirculation
Moderate SeverityBank 1 Sensor 1
Low SeverityCircuit Malfunction
High SeverityBank 1 Sensor 2
Low SeverityDetected
High SeverityGeneral Malfunction
Moderate SeverityBank 1
Moderate SeverityMalfunction
Low SeverityDiagnostic codes are organized into different categories
Engine, transmission, and emissions-related codes. Most common category.
Example: P0420, P0300, P0171
Brakes, steering, and suspension system codes.
Example: C0035, C0050
Interior and accessory-related codes like airbags, climate control.
Example: B0001, B1000
Communication and network-related codes between modules.
Example: U0100, U0155
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