OBD-II trouble codes
Ranked by how often the code appears in real NHTSA owner complaints - not alphabetically. P = powertrain, B = body, C = chassis, U = network.
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Codes whose typical symptoms include poor fuel economy - most serious first:
P0202Cylinder 2 Injector A CircuitP0204Cylinder 4 Injector A CircuitP0300Random/Multiple Cylinder Misfire DetectedP0302Cylinder 2 Misfire DetectedP0304Cylinder 4 Misfire DetectedP0306Cylinder 6 Misfire DetectedP0351Ignition Coil A Primary Control Circuit/OpenP0353Ignition Coil C Primary Control Circuit/OpenP0355Ignition Coil E Primary Control Circuit/OpenP0011A Camshaft Position - Timing Over-Advanced or System Performance Bank 1P0013B Camshaft Position Actuator A Control Circuit/Open Bank 1P0100Mass or Volume Air Flow Sensor A CircuitP0101Mass or Volume Air Flow Sensor A Circuit Range/PerformanceP0103Mass or Volume Air Flow Sensor A Circuit HighP0106Manifold Absolute Pressure/Barometric Pressure Sensor Circuit Range/PerformanceP0107Manifold Absolute Pressure/Barometric Pressure Sensor Circuit LowP0108Manifold Absolute Pressure/Barometric Pressure Sensor Circuit HighP0117Engine Coolant Temperature Sensor 1 Circuit LowP0118Engine Coolant Temperature Sensor 1 Circuit HighP0130O2 Sensor Circuit Bank 1 Sensor 1P0132O2 Sensor Circuit High Voltage Bank 1 Sensor 1P0134O2 Sensor Circuit No Activity Detected Bank 1 Sensor 1P0151O2 Sensor Circuit Low Voltage Bank 2 Sensor 1P0153O2 Sensor Circuit Slow Response Bank 2 Sensor 1P0170Fuel Trim Bank 1P0172System Too Rich Bank 1P0173Fuel Trim Bank 2P0175System Too Rich Bank 2P0326Knock/Combustion Vibration Sensor A Circuit Range/PerformanceP0327Knock/Combustion Vibration Sensor A Circuit LowP0330Knock/Combustion Vibration Sensor B CircuitP0711Transmission Fluid Temperature Sensor A Circuit Range/PerformanceP0712Transmission Fluid Temperature Sensor A Circuit LowP0741Torque Converter Clutch Circuit Performance/Stuck OffP0743Torque Converter Clutch Circuit ElectricalP0766Shift Solenoid D Performance/Stuck OffP2004Intake Manifold Runner Control Stuck Open Bank 1P2006Intake Manifold Runner Control Stuck Closed Bank 1P2188System Too Rich at Idle Bank 1P2190System Too Rich at Idle Bank 2