PistonCMS Automotive Knowledge Base
Automotive Diagnostic Code Lookup
Find OBD-II codes fast, or start with the symptom and work toward the most likely diagnostic path.
Built for working mechanics
Diagnostic workflows
Customer explanations
Repair cost and labor ranges
Shop-focused PistonCMS tools
Search Results for “poor fuel economy”
P0010 ★★★★★Intake Camshaft Position Actuator Circuit (Bank 1)P0011 ★★★★★Intake Camshaft Position Timing Over-Advanced (Bank 1)P0012 ★★★★★Intake Camshaft Position Timing Over-Retarded (Bank 1)P0013 ★★★★★Exhaust Camshaft Position Actuator Circuit (Bank 1)P0014 ★★★★★Exhaust Camshaft Position Timing Over-Advanced (Bank 1)P0016 ★★★★★Crankshaft/Camshaft Position Correlation (Bank 1 Sensor A)P0017 ★★★★★Crankshaft/Camshaft Position Correlation (Bank 1 Sensor B)P0087 ★★★★★Fuel Rail/System Pressure Too LowP0088 ★★★★★Fuel Rail/System Pressure Too HighP0104 ★★★★Mass Air Flow Circuit IntermittentP0134 ★★★★★Oxygen Sensor Circuit No Activity Detected Bank 1 Sensor 1P0140 ★★★★★Oxygen Sensor Circuit No Activity Detected Bank 1 Sensor 2P0141 ★★★★★Oxygen Sensor Heater Circuit Malfunction Bank 1 Sensor 2P0150 ★★★★★Oxygen Sensor Circuit Malfunction Bank 2 Sensor 1P0151 ★★★★★Oxygen Sensor Circuit Low Voltage Bank 2 Sensor 1P0152 ★★★★★Oxygen Sensor Circuit High Voltage Bank 2 Sensor 1P0153 ★★★★★Oxygen Sensor Circuit Slow Response Bank 2 Sensor 1P0154 ★★★★★Oxygen Sensor Circuit No Activity Detected Bank 2 Sensor 1P0155 ★★★★★Oxygen Sensor Heater Circuit Malfunction Bank 2 Sensor 1P0156 ★★★★★Oxygen Sensor Circuit Malfunction Bank 2 Sensor 2P0157 ★★★★★Oxygen Sensor Circuit Low Voltage Bank 2 Sensor 2P0158 ★★★★★Oxygen Sensor Circuit High Voltage Bank 2 Sensor 2P0160 ★★★★★Oxygen Sensor Circuit No Activity Detected Bank 2 Sensor 2P0161 ★★★★★Oxygen Sensor Heater Circuit Malfunction Bank 2 Sensor 2P0171 ★★★★★System Too Lean Bank 1P0172 ★★★★System Too Rich Bank 1P0174 ★★★★★System Too Lean Bank 2P0175 ★★★★System Too Rich Bank 2P0191 ★★★★★Fuel Rail Pressure Sensor Range/PerformanceP0230 ★★★Fuel Pump Primary Circuit MalfunctionP0231 ★★★Fuel Pump Secondary Circuit LowP0232 ★★★Fuel Pump Secondary Circuit HighP0261 ★★★Cylinder 1 Injector Circuit LowP0262 ★★★Cylinder 1 Injector Circuit HighP0264 ★★★Cylinder 2 Injector Circuit LowP0265 ★★★Cylinder 2 Injector Circuit HighP0267 ★★★Cylinder 3 Injector Circuit LowP0268 ★★★Cylinder 3 Injector Circuit HighP0270 ★★★Cylinder 4 Injector Circuit LowP0271 ★★★Cylinder 4 Injector Circuit HighP0273 ★★★Cylinder 5 Injector Circuit LowP0274 ★★★Cylinder 5 Injector Circuit HighP0276 ★★★Cylinder 6 Injector Circuit LowP0277 ★★★Cylinder 6 Injector Circuit HighP0279 ★★★Cylinder 7 Injector Circuit LowP0280 ★★★Cylinder 7 Injector Circuit HighP0282 ★★★Cylinder 8 Injector Circuit LowP0283 ★★★Cylinder 8 Injector Circuit HighP0300 ★★★★★Random/Multiple Cylinder Misfire DetectedP0301 ★★★★★Cylinder 1 Misfire DetectedP0302 ★★★★★Cylinder 2 Misfire DetectedP0303 ★★★★★Cylinder 3 Misfire DetectedP0304 ★★★★★Cylinder 4 Misfire DetectedP0305 ★★★★★Cylinder 5 Misfire DetectedP0306 ★★★★★Cylinder 6 Misfire DetectedP0307 ★★★★★Cylinder 7 Misfire DetectedP0308 ★★★★★Cylinder 8 Misfire DetectedP0313 ★★★★Misfire Detected With Low FuelP0316 ★★★★Engine Misfire Detected on StartupP0350 ★★★★Ignition Coil Primary/Secondary Circuit MalfunctionP0351 ★★★★Ignition Coil A Primary/Secondary Circuit MalfunctionP0352 ★★★★Ignition Coil B Primary/Secondary Circuit MalfunctionP0353 ★★★★Ignition Coil C Primary/Secondary Circuit MalfunctionP0354 ★★★★Ignition Coil D Primary/Secondary Circuit MalfunctionP0355 ★★★★Ignition Coil E Primary/Secondary Circuit MalfunctionP0356 ★★★★Ignition Coil F Primary/Secondary Circuit MalfunctionP0357 ★★★★Ignition Coil G Primary/Secondary Circuit MalfunctionP0358 ★★★★Ignition Coil H Primary/Secondary Circuit MalfunctionP0461 ★★★Fuel Level Sensor Circuit Range/PerformanceP0462 ★★★Fuel Level Sensor Circuit Low InputP0463 ★★★Fuel Level Sensor Circuit High InputP1000 ★★★★OBD System Readiness Test Not CompleteP1008 ★★★★Engine Coolant Bypass Valve ControlP1016 ★★★★Reductant Quality Sensor CircuitP1017 ★★★★Reductant Injector CircuitP1018 ★★★★NOx Sensor Circuit FaultP1019 ★★★★Reductant Tank Heater CircuitP1026 ★★★★Coolant Control Valve FaultP1028 ★★★★EGR Temperature Sensor FaultP1029 ★★★★Exhaust Temperature Sensor FaultP1030 ★★★★Air Fuel Ratio Sensor CircuitP1031 ★★★★Air Fuel Ratio Sensor Heater CircuitP1032 ★★★★Oxygen Sensor Heater Control CircuitP1033 ★★★★NOx Sensor Signal PerformanceP1034 ★★★★Reductant Pressure Sensor CircuitP1035 ★★★★EGR Valve Position Sensor CircuitP1065 ★★★★EVAP Purge Flow PerformanceP1066 ★★★★EVAP Vent Control PerformanceP1067 ★★★★Secondary Air Injection Flow PerformanceP1068 ★★★★Secondary Air Pump Control CircuitP1069 ★★★★Secondary Air Valve Control CircuitP1070 ★★★★EGR Flow PerformanceP1071 ★★★★EGR Valve Control Circuit LowP1072 ★★★★EGR Valve Control Circuit HighP1073 ★★★★Exhaust Gas Temperature Sensor CircuitP1074 ★★★★Exhaust Gas Temperature Sensor Range/PerformanceP1075 ★★★★Diesel Particulate Filter Pressure Sensor CircuitP1076 ★★★★Diesel Particulate Filter Regeneration PerformanceP1077 ★★★★Reductant Pump Control CircuitP1078 ★★★★Reductant Heater Control CircuitP1079 ★★★★SCR System PerformanceP1096 ★★★★Cooling Fan Relay Control CircuitP1114 ★★★★Engine Coolant Temperature Sensor Low VoltageP1115 ★★★★Engine Coolant Temperature Sensor Circuit IntermittentP1116 ★★★★Engine Coolant Temperature Sensor Out of RangeP1117 ★★★★Engine Coolant Temperature Sensor IntermittentP1118 ★★★★Engine Coolant Temperature Sensor Signal HighP1119 ★★★★Engine Coolant Temperature Sensor Signal LowP1127 ★★★★Exhaust Temperature Sensor Too HighP1128 ★★★★Fuel Trim System Too LeanP1129 ★★★★Fuel Trim System Too RichP1130 ★★★★Heated Oxygen Sensor Insufficient SwitchingP1131 ★★★★Lack of HO2S Switch Indicates LeanP1132 ★★★★Lack of HO2S Switch Indicates RichP1133 ★★★★HO2S Insufficient Switching Bank 1 Sensor 1P1134 ★★★★HO2S Transition Time Ratio FaultP1135 ★★★★Air/Fuel Sensor Heater CircuitP1136 ★★★★Fuel Trim System Lean at IdleP1137 ★★★★Fuel Trim System Rich at IdleP1138 ★★★★HO2S Sensor Rich or High VoltageP1143 ★★★★HO2S Signal Lean During Power EnrichmentP1144 ★★★★HO2S Signal Rich During DecelerationP1146 ★★★★Heated Oxygen Sensor Circuit Low Bank 1 Sensor 1P1147 ★★★★Heated Oxygen Sensor Circuit High Bank 1 Sensor 1P1148 ★★★★Closed Loop Control Function Bank 1P1149 ★★★★Closed Loop Control Function Bank 2P1150 ★★★★Air/Fuel Sensor Range PerformanceP1151 ★★★★HO2S Indicates Lean Bank 2P1152 ★★★★HO2S Indicates Rich Bank 2P1153 ★★★★HO2S Insufficient Switching Bank 2 Sensor 1P1154 ★★★★HO2S Transition Time Ratio Bank 2P1155 ★★★★Air/Fuel Sensor Heater Circuit Bank 2P1156 ★★★★Fuel Trim Lean Bank 2P1157 ★★★★Fuel Trim Rich Bank 2P1158 ★★★★HO2S Sensor Rich or High Voltage Bank 2P1166 ★★★★Air/Fuel Ratio Sensor Heater LowP1167 ★★★★Air/Fuel Ratio Sensor Heater HighP1168 ★★★★Closed Loop Control Function Bank 1P1169 ★★★★Closed Loop Control Function Bank 2P1170 ★★★★Fuel Trim MalfunctionP1171 ★★★★System Too Lean During AccelerationP1172 ★★★★System Too Rich During AccelerationP1173 ★★★★Fuel Trim Adaptation AdditiveP1174 ★★★★Fuel Trim Cylinder Balance Bank 1P1175 ★★★★Fuel Trim Cylinder Balance Bank 2
Diagnostic Assistant
What are you working on?
Choose the closest problem and the Knowledge Base will point you toward related codes and diagnostic pages.
I have a codeType P0300, P0420, P0171, or any code your scanner shows.Engine is misfiringRough idle, shaking, flashing Check Engine Light, or loss of power.EVAP / gas cap issueFuel smell, emissions leak, small leak, large leak, purge or vent valve.Runs lean or richFuel trims, vacuum leaks, MAF issues, hesitation, or poor fuel economy.Oxygen sensor / catalystO2 sensor response, heater circuit, catalyst efficiency, emissions failure.Transmission problemHarsh shifting, slipping, incorrect gear ratio, solenoid or speed sensor codes.
Browse by category
Find codes by system
Popular codes
Start with the common ones
P0010 ★★★★★Intake Camshaft Position Actuator Circuit (Bank 1)P0011 ★★★★★Intake Camshaft Position Timing Over-Advanced (Bank 1)P0012 ★★★★★Intake Camshaft Position Timing Over-Retarded (Bank 1)P0013 ★★★★★Exhaust Camshaft Position Actuator Circuit (Bank 1)P0014 ★★★★★Exhaust Camshaft Position Timing Over-Advanced (Bank 1)P0016 ★★★★★Crankshaft/Camshaft Position Correlation (Bank 1 Sensor A)P0017 ★★★★★Crankshaft/Camshaft Position Correlation (Bank 1 Sensor B)P0087 ★★★★★Fuel Rail/System Pressure Too LowP0088 ★★★★★Fuel Rail/System Pressure Too HighP0100 ★★★★★Mass Air Flow Circuit MalfunctionP0101 ★★★★★Mass Air Flow Circuit Range/PerformanceP0102 ★★★★★Mass Air Flow Circuit Low Input
Search by symptom
I need help with...
Coming soon
Daily Toolbox
VIN decoder, recall lookup, maintenance calculators, fluid capacities, torque specs, and shop calculators will live here as the Knowledge Base grows.
VIN DecoderRecall LookupFluid CapacitiesTorque SpecsMaintenance CalculatorShop Hour Calculator
Working on this repair?
Create a professional estimate in minutes.
✓ Email it to your customer✓ Track labor and parts✓ Convert it into an invoice✓ Keep a complete repair history
Start Free PistonCMS Account