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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.

Check soon P · Powertrain Clear all

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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 193–216 of 6682

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P0120Throttle/Pedal Position Sensor/Switch A CircuitCheck soonSensors & Electronics45–120 minutes for initial diagnosisP0120 means Throttle/Pedal Position Sensor/Switch A Circuit. Learn the likely symptoms, common causes, and a safe diagnostic order before replacing parts.P0125Insufficient Coolant Temperature for Closed Loop Fuel ControlCheck soonFuel System30–120 minutes for initial diagnosisP0125 relates to insufficient coolant temperature for closed loop fuel control. Check the fault conditions and vehicle-specific procedure before replacing parts.P0126Insufficient Coolant Temperature for Stable OperationCheck soonEngine Problems30–120 minutes for initial diagnosisP0126 relates to insufficient coolant temperature for stable operation. Check the fault conditions and vehicle-specific procedure before replacing parts.P0127Intake Air Temperature Too HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0127 relates to intake air temperature too high. Check the fault conditions and vehicle-specific procedure before replacing parts.P0129Barometric Pressure Too LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP0129 relates to barometric pressure too low. Check the fault conditions and vehicle-specific procedure before replacing parts.P012ATurbocharger/Supercharger Inlet Pressure Sensor A CircuitCheck soonSensors & Electronics30–120 minutes for initial diagnosisP012A relates to turbocharger/supercharger inlet pressure sensor a circuit. Check the fault conditions and vehicle-specific procedure before replacing parts.P012BTurbocharger/Supercharger Inlet Pressure Sensor A Circuit Range/PerformanceCheck soonSensors & Electronics30–120 minutes for initial diagnosisP012B relates to turbocharger/supercharger inlet pressure sensor a circuit range/performance. Check the fault conditions and vehicle-specific procedure before replacing parts.P012CTurbocharger/Supercharger Inlet Pressure Sensor A Circuit LowCheck soonSensors & Electronics30–120 minutes for initial diagnosisP012C relates to turbocharger/supercharger inlet pressure sensor a circuit low. Check the fault conditions and vehicle-specific procedure before replacing parts.P012DTurbocharger/Supercharger Inlet Pressure Sensor A Circuit HighCheck soonSensors & Electronics30–120 minutes for initial diagnosisP012D relates to turbocharger/supercharger inlet pressure sensor a circuit high. Check the fault conditions and vehicle-specific procedure before replacing parts.P012ETurbocharger/Supercharger Inlet Pressure Sensor A Circuit Intermittent/ErraticCheck soonSensors & Electronics30–120 minutes for initial diagnosisP012E relates to turbocharger/supercharger inlet pressure sensor a circuit intermittent/erratic. Check the fault conditions and vehicle-specific procedure before replacing parts.P012FEngine Coolant Temperature / Engine Oil Temperature CorrelationCheck soonEngine Problems30–120 minutes for initial diagnosisP012F relates to engine coolant temperature / engine oil temperature correlation. Check the fault conditions and vehicle-specific procedure before replacing parts.P013AO2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP013A relates to o2 sensor slow response - rich to lean bank 1 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P013BO2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP013B relates to o2 sensor slow response - lean to rich bank 1 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P013CO2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP013C relates to o2 sensor slow response - rich to lean bank 2 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P013DO2 Sensor Slow Response - Lean to Rich Bank 2 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP013D relates to o2 sensor slow response - lean to rich bank 2 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P013EO2 Sensor Delayed Response - Rich to Lean Bank 1 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP013E relates to o2 sensor delayed response - rich to lean bank 1 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P013FO2 Sensor Delayed Response - Lean to Rich Bank 1 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP013F relates to o2 sensor delayed response - lean to rich bank 1 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P0142Oxygen Sensor Circuit Bank 1 Sensor 3Check soonEmissions System45–120 minutes for initial diagnosisP0142 means Oxygen Sensor Circuit Bank 1 Sensor 3. Learn the likely symptoms, causes, safety implications, and a practical diagnostic order.P0148Fuel Delivery ErrorCheck soonFuel System30–120 minutes for initial diagnosisP0148 relates to fuel delivery error. Check the fault conditions and vehicle-specific procedure before replacing parts.P0149Fuel Timing ErrorCheck soonFuel System30–120 minutes for initial diagnosisP0149 relates to fuel timing error. Check the fault conditions and vehicle-specific procedure before replacing parts.P014AO2 Sensor Delayed Response - Rich to Lean Bank 2 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP014A relates to o2 sensor delayed response - rich to lean bank 2 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P014BO2 Sensor Delayed Response - Lean to Rich Bank 2 Sensor 2Check soonSensors & Electronics30–120 minutes for initial diagnosisP014B relates to o2 sensor delayed response - lean to rich bank 2 sensor 2. Check the fault conditions and vehicle-specific procedure before replacing parts.P014CO2 Sensor Slow Response - Rich to Lean Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP014C relates to o2 sensor slow response - rich to lean bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.P014DO2 Sensor Slow Response - Lean to Rich Bank 1 Sensor 1Check soonSensors & Electronics30–120 minutes for initial diagnosisP014D relates to o2 sensor slow response - lean to rich bank 1 sensor 1. Check the fault conditions and vehicle-specific procedure before replacing parts.