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9,253 diagnostic guides

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Find codes by symptomChoose what you notice to search matching code guides.

Rough idle or shakingVibration while stopped Hard to startLong cranking or no-start Engine stallsCuts out at idle or on the road Hesitates or loses powerSlow response when accelerating Battery light is onCharging system warning Harsh 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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Engine1049 Emissions515 Fuel1016 Sensors & Electronics2110 Transmission866 Electrical & Charging1797 Body & Restraints193 Chassis & Brakes479 Network & Communication1228

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All severities9253 Low priority305 Check soon8256 Urgent621

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All families9253 P · Powertrain7353 B · Body193 C · Chassis479 U · Network1228

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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 2065–2088 of 2110

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P0103Mass or Volume Air Flow Circuit High InputCheck soonSensors & Electronics45–120 minutes for initial diagnosisP0103 means Mass or Volume Air Flow Circuit High Input. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0104Mass or Volume Air Flow Circuit IntermittentCheck soonSensors & Electronics45–120 minutes for initial diagnosisP0104 means Mass or Volume Air Flow Circuit Intermittent. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0107Manifold Absolute Pressure/Barometric Pressure Circuit Low InputCheck soonSensors & Electronics45–120 minutes for initial diagnosisP0107 means Manifold Absolute Pressure/Barometric Pressure Circuit Low Input. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0108Manifold Absolute Pressure/Barometric Pressure Circuit High InputCheck soonSensors & Electronics45–120 minutes for initial diagnosisP0108 means Manifold Absolute Pressure/Barometric Pressure Circuit High Input. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0109Manifold Absolute Pressure/Barometric Pressure Circuit IntermittentCheck soonSensors & Electronics45–120 minutes for initial diagnosisP0109 means Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0110Intake Air Temperature Sensor 1 CircuitCheck soonSensors & Electronics45–120 minutes for initial diagnosisP0110 means Intake Air Temperature Sensor 1 Circuit. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0111Intake Air Temperature Sensor 1 Circuit Range/PerformanceCheck soonSensors & Electronics45–120 minutes for initial diagnosisP0111 means Intake Air Temperature Sensor 1 Circuit Range/Performance. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0112Intake Air Temperature Sensor 1 Circuit LowCheck soonSensors & Electronics45–120 minutes for initial diagnosisP0112 means Intake Air Temperature Sensor 1 Circuit Low. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0113Intake Air Temperature Sensor High InputSensors & ElectronicsFix P0113 IAT sensor code. Learn about intake air temperature sensor problems and solutions.P0117Engine Coolant Temperature Sensor Low InputSensors & ElectronicsDiagnose P0117 coolant temperature sensor code. Learn why the ECT reads low and how to test and replace it.P0119Engine Coolant Temperature Sensor 1 Circuit IntermittentCheck soonSensors & Electronics45–120 minutes for initial diagnosisP0119 means Engine Coolant Temperature Sensor 1 Circuit Intermittent. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0122Throttle/Pedal Position Sensor A Circuit Low InputSensors & ElectronicsDiagnose P0122 throttle position sensor code. Learn why the TPS reads low and how to test and replace it.P0123Throttle/Pedal Position Sensor/Switch A Circuit High InputCheck soonSensors & Electronics45–120 minutes for initial diagnosisP0123 means Throttle/Pedal Position Sensor/Switch A Circuit High Input. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0124Throttle/Pedal Position Sensor/Switch A Circuit IntermittentCheck soonSensors & Electronics45–120 minutes for initial diagnosisP0124 means Throttle/Pedal Position Sensor/Switch A Circuit Intermittent. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0137Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2Low prioritySensors & Electronics30–90 minutes for initial diagnosisP0137 means Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0138Oxygen Sensor Circuit High Voltage Bank 1 Sensor 2Low prioritySensors & Electronics30–90 minutes for initial diagnosisP0138 means Oxygen Sensor Circuit High Voltage Bank 1 Sensor 2. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0139Oxygen Sensor Circuit Slow Response Bank 1 Sensor 2Low prioritySensors & Electronics30–90 minutes for initial diagnosisP0139 means Oxygen Sensor Circuit Slow Response Bank 1 Sensor 2. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0151Oxygen Sensor Circuit Low Voltage Bank 2 Sensor 1Low prioritySensors & Electronics30–90 minutes for initial diagnosisP0151 means Oxygen Sensor Circuit Low Voltage Bank 2 Sensor 1. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0152Oxygen Sensor Circuit High Voltage Bank 2 Sensor 1Low prioritySensors & Electronics30–90 minutes for initial diagnosisP0152 means Oxygen Sensor Circuit High Voltage Bank 2 Sensor 1. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0153Oxygen Sensor Circuit Slow Response Bank 2 Sensor 1Low prioritySensors & Electronics30–90 minutes for initial diagnosisP0153 means Oxygen Sensor Circuit Slow Response Bank 2 Sensor 1. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0154Oxygen Sensor Circuit No Activity Detected Bank 2 Sensor 1Low prioritySensors & Electronics30–90 minutes for initial diagnosisP0154 means Oxygen Sensor Circuit No Activity Detected Bank 2 Sensor 1. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0155Oxygen Sensor Heater Circuit Bank 2 Sensor 1Low prioritySensors & Electronics30–90 minutes for initial diagnosisP0155 means Oxygen Sensor Heater Circuit Bank 2 Sensor 1. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0156Oxygen Sensor Circuit Bank 2 Sensor 2Low prioritySensors & Electronics30–90 minutes for initial diagnosisP0156 means Oxygen Sensor Circuit Bank 2 Sensor 2. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0157Oxygen Sensor Circuit Low Voltage Bank 2 Sensor 2Low prioritySensors & Electronics30–90 minutes for initial diagnosisP0157 means Oxygen Sensor Circuit Low Voltage Bank 2 Sensor 2. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.