Diagnostic library
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Search the code from your scanner, then narrow the library by system, severity, or code family.
9,253 diagnostic guides
Find codes by symptomChoose what you notice to search matching code guides.
Rough idle or shakingVibration while stoppedHard to startLong cranking or no-startEngine stallsCuts out at idle or on the roadHesitates or loses powerSlow response when acceleratingBattery light is onCharging system warningHarsh gear changesDelayed or rough shifting
A symptom can have several causes. Treat matching codes as clues and follow the diagnostic checks in each guide.
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These are generic OBD2 definitions. Exact make, model, engine, and year compatibility will appear after vehicle-fitment data is added.
Diagnostic codes
Showing 1705–1728 of 2110
P2A04O2 Sensor Circuit Range/Performance Bank 2 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A05O2 Sensor Circuit Range/Performance Bank 2 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A0AManifold Absolute Pressure Sensor B CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2A0BManifold Absolute Pressure Sensor B Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2A0CManifold Absolute Pressure Sensor B Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2A0DManifold Absolute Pressure Sensor B Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2A0EManifold Absolute Pressure Sensor B Circuit Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2A38O2 Sensor Positive Current Control Circuit/Open Bank 1 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A39O2 Sensor Positive Current Control Circuit Low Bank 1 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A3AO2 Sensor Positive Current Control Circuit High Bank 1 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A3BO2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A3CO2 Sensor Negative Current Control Circuit Low Bank 1 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2A3DO2 Sensor Negative Current Control Circuit High Bank 1 Sensor 3Check soonSensors & Electronics30–120 minutes for initial diagnosisP2AB3Cold Start Intake Manifold Runner Control Stuck Open Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2AB4Cold Start Intake Manifold Runner Control Stuck Open Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2AB5Cold Start Intake Manifold Runner Control Stuck Closed Bank 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP2AB6Cold Start Intake Manifold Runner Control Stuck Closed Bank 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP2AB7Wastegate Position Sensor A CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2AB8Wastegate Position Sensor A Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2AB9Wastegate Position Sensor A Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2ABAWastegate Position Sensor B CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2ABBWastegate Position Sensor B Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2ABCWastegate Position Sensor B Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP2ABDTurbocharger/Supercharger Wastegate Actuator A Driver Current/Temperature Too HighCheck soonSensors & Electronics30–120 minutes for initial diagnosis