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OBD-II error codes explained: AI-powered analysis, real scan data, causes & fixes.

Try: P0302, misfire cylinder 2, oxygen sensor, Volkswagen P0505
P0420 P0300 P0171 P0442 P0455 C0035
55 codes 2 systems
🔥 Popular Codes 🔍 By Symptom 🛞 Chassis 1 ⚙️ Powertrain 54 💡 Share Your Car Experience

🔍 By Symptom

Check engine light on Engine misfires Poor fuel economy Rough idle Fuel smell Car won't start Car shakes at idle

🛞 Chassis (1)

ABS, steering & suspension

C0035 Left Front Wheel Speed Sensor Circuit
Medium

⚙️ Powertrain (54)

Engine, transmission, fuel & emissions

P0010 Intake Camshaft Position Actuator Circuit (Bank 1)
Medium
P0011 Intake Camshaft Position Timing Over-Advanced (Bank 1)
Medium
P0012 Intake Camshaft Position Timing Over-Retarded (Bank 1)
Medium
P0014 Exhaust Camshaft Position Timing Over-Advanced (Bank 1)
Medium
P0016 Crankshaft/Camshaft Position Correlation (Bank 1 Sensor A)
High
P0017 Crankshaft/Camshaft Position Correlation (Bank 1 Sensor B)
High
P0043 Oxygen Sensor Heater Control Circuit (Bank 1)
Medium
P0051 O2 Sensor Heater Control Circuit Low (Bank 2 Sensor 1)
Medium
P0101 Mass Air Flow Sensor Circuit Range/Performance
Medium
P0102 Mass Air Flow Sensor Circuit Low Input
Medium
P0103 Mass Air Flow Sensor Circuit High Input
Medium
P0113 Intake Air Temperature Sensor Circuit High Input
Low
P0117 Engine Coolant Temperature Sensor Low Input
Medium
P0118 Engine Coolant Temperature Sensor High Input
Medium
P0128 The engine coolant temperature is not reaching the proper operating temperature
Medium
P0130 O2 Sensor Circuit (Bank 1, Sensor 1)
Medium
P0135 O2 Sensor Heater Circuit (Bank 1, Sensor 1)
Low
P0137 O2 Sensor Low Voltage (Bank 1, Sensor 2)
Medium
P0141 O2 Sensor Heater Circuit (Bank 1, Sensor 2)
Low
P0155 O2 Sensor Heater Circuit (Bank 2, Sensor 1)
Low
P0161 O2 Sensor Heater Circuit (Bank 2, Sensor 2)
Low
P0170 Fuel Trim (Bank 1)
Medium
P0171 System Too Lean (Bank 1)
Medium
P0172 System Too Rich (Bank 1)
Medium
P0174 System Too Lean (Bank 2)
Medium
P0175 System Too Rich (Bank 2)
Medium
P0191 Fuel Rail Pressure Sensor Circuit Range/Performance
Medium
P0201 Injector Circuit/Open — Cylinder 1
High
P0202 Injector Circuit/Open — Cylinder 2
High
P0300 Random/Multiple Cylinder Misfire Detected
High
P0301 Cylinder 1 Misfire Detected
High
P0302 Cylinder 2 Misfire Detected
High
P0303 Cylinder 3 Misfire Detected
High
P0304 Cylinder 4 Misfire Detected
High
P0335 Crankshaft Position Sensor A Circuit
Critical
P0340 Camshaft Position Sensor A Circuit (Bank 1)
High
P0341 Camshaft Position Sensor A Range/Performance (Bank 1)
High
P0402 EGR Flow Excessive Detected
Medium
P0410 Secondary Air Injection System
Low
P0411 Secondary Air Injection System Incorrect Flow
Low
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
Medium
P0430 Catalyst System Efficiency Below Threshold (Bank 2)
Medium
P0440 EVAP Emission Control System
Low
P0441 EVAP Emission Control System Incorrect Purge Flow
Low
P0442 EVAP Emission Control System Leak Detected (Small Leak)
Low
P0446 EVAP Vent Control Circuit
Low
P0451 EVAP Pressure Sensor Range/Performance
Low
P0455 EVAP Emission Control System Leak Detected (Large Leak)
Medium
P0456 EVAP Emission Control System Leak Detected (Very Small Leak)
Low
P0457 EVAP Emission Control System Leak Detected (Fuel Cap Loose/Off)
Low
P0460 Fuel Level Sensor Circuit
Low
P0505 P0505 indicates that the Idle Air Control (IAC) system is not functioning correc
High
P0507 Idle Control System RPM Higher Than Expected
Medium
P0726 OBD-II code P0726 indicates a problem with the input speed sensor circuit, speci
High

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