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P0400 P0400 Code — Exhaust Gas Recirculation (EGR) Flow Malfunction (Causes & How to Fix) P0401 P0401 Code — EGR Flow Insufficient Detected (Causes & How to Fix) P0402 P0402 Code — EGR Flow Excessive Detected (Causes & How to Fix) P0410 P0410 Code — Secondary Air Injection System Malfunction (Causes, Diagnosis & Repair) P0411 P0411 Code — Secondary Air Injection System Incorrect Flow (Causes & How to Fix) P0420 P0420 Code — Catalyst System Efficiency Below Threshold (Causes & How to Fix) P0430 P0430 Code — Catalyst System Efficiency Below Threshold (Bank 2) (Causes & How to Fix) P0441 P0441 Code — EVAP Emission Control System Incorrect Purge Flow (Causes & How to Fix) P0442 P0442 Code — EVAP System Leak Detected (Small Leak) (Is It Serious? How to Fix) P0443 P0443 Code — EVAP Purge Control Valve Circuit Malfunction (Causes & How to Fix) P0446 P0446 Code — EVAP Vent Control Circuit Malfunction (Causes & How to Fix) P0449 P0449 Code — EVAP Vent Valve/Solenoid Circuit Malfunction (Causes & How to Fix) P0451 P0451 Code — EVAP Pressure Sensor Range/Performance (Causes & How to Fix) P0452 P0452 Code — EVAP Pressure Sensor Low Input (Causes & How to Fix) P0455 P0455 Code — EVAP System Leak Detected (Gross Leak) (Causes & How to Fix) P0456 P0456 Code — EVAP System Leak Detected (Very Small Leak) (Causes & How to Fix) P0496 P0496 Code — EVAP System High Purge Flow (Causes & How to Fix) P1457 P1457 Code — EVAP Leak Detected (Control Canister System) (Causes & How to Fix) SYMPTOM-FAILED-EMISSIONS SYMPTOM-FAILED-EMISSIONS Code — Failed emissions test — common codes and fixes (Causes & How to Fix) P0010 P0010 Code: Intake Camshaft Position Actuator Circuit (Bank 1) — Diagnosis & Fix Guide (2026) P0011 P0011 Code: Intake Camshaft Position Timing Over-Advanced (Bank 1) — Diagnosis & Fix Guide (2026) P0012 P0012 Code — Intake Camshaft Position Timing Over-Retarded (Bank 1) (Causes, Cost & How to Fix) P0013 P0013 Code — Exhaust Camshaft Position Actuator Circuit (Bank 1) (Causes, Cost & How to Fix) P0014 P0014 Code — Exhaust Camshaft Position Timing Over-Advanced (Bank 1) (Causes, Cost & How to Fix) P0016 P0016 Code — Crankshaft/Camshaft Position Correlation (Bank 1 Sensor A) — Diagnosis & Fix Guide 2026 P0017 P0017 Code: Crankshaft/Camshaft Position Correlation (Bank 1 Sensor B) — Diagnosis & Fix Guide (2026) P0021 P0021 Code — Intake Camshaft Position Timing Over-Advanced (Bank 2) (Causes, Cost & How to Fix) P1259 P1259 Code — VTEC System Malfunction (Causes & How to Fix) P1326 P1326 Code: Connecting Rod Bearing - KSDS (Knock Sensor Detection System) — Diagnosis & Fix Guide (2026) P1349 P1349 Code: VVT System Malfunction (Bank 1) — Diagnosis & Fix Guide (2026) SYMPTOM-OVERHEATING SYMPTOM-OVERHEATING Code: Car Overheating — Temperature Gauge High Causes and Fixes — Diagnosis & Fix Guide (2026) SYMPTOM-WHITE-SMOKE SYMPTOM-WHITE-SMOKE Code: White Smoke from Exhaust — Causes, Severity, and Repair Guide P0030 P0030 Code — HO2S Heater Control Circuit (Bank 1, Sensor 1) (Causes & How to Fix) P0056 P0056 Code — HO2S Heater Control Circuit (Bank 2, Sensor 2) (Causes & How to Fix) P0100 P0100 Code — Mass Air Flow (MAF) Circuit Malfunction (Causes & How to Fix) P0101 P0101 Code — Mass Air Flow (MAF) Circuit Range/Performance (Causes, Cost & How to Fix) P0102 P0102 Code — Mass Air Flow (MAF) Circuit Low Input (Causes & How to Fix) P0103 P0103 Code — Mass Air Flow (MAF) Circuit High Input (Causes & How to Fix) P0106 P0106 Code — MAP/Barometric Pressure Circuit Range/Performance (Causes & How to Fix) P0107 P0107 Code — MAP/Barometric Pressure Circuit Low Input (Causes & How to Fix) P0110 P0110 Code — Intake Air Temperature (IAT) Circuit Malfunction (Causes & How to Fix) P0113 P0113 Code — Intake Air Temperature (IAT) Circuit High Input (Causes & How to Fix) P0120 P0120 Code — Throttle Position Sensor/Switch A Circuit Malfunction (Causes & How to Fix) P0121 P0121 Code — Throttle Position Sensor/Switch A Range/Performance (Causes & How to Fix) P0122 P0122 Code — Throttle Position Sensor/Switch A Circuit Low (Causes & How to Fix) P0125 P0125 Code — Insufficient Coolant Temperature for Closed Loop Fuel Control (Causes & How to Fix) P0128 P0128 Code: Coolant Thermostat Below Regulating Temperature — Diagnosis & Fix Guide (2026) P0130 P0130 Code — O2 Sensor Circuit Malfunction (Bank 1, Sensor 1) (Causes & How to Fix) P0131 P0131 Code — O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1) (Causes & How to Fix) P0133 P0133 Code: O2 Sensor Circuit Slow Response (Bank 1, Sensor 1) — Diagnosis & Fix Guide (2026) P0135 P0135 Code — O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1) (Causes, Cost & How to Fix) P0136 P0136 Code: O2 Sensor Circuit Malfunction (Bank 1, Sensor 2) — Diagnosis & Fix Guide (2026) P0137 P0137 Code — O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2) (Causes & How to Fix) P0138 P0138 Code — O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) (Causes & How to Fix) P0141 P0141 Code — O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2) (Causes & How to Fix) P0155 P0155 Code: O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 1) — Diagnosis & Fix Guide 2026 P0157 P0157 Code — O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2) (Causes & How to Fix) P0158 P0158 Code — O2 Sensor Circuit High Voltage (Bank 2, Sensor 2) (Causes & How to Fix) P0161 P0161 Code — O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 2) (Causes & How to Fix) P0171 P0171 Code: System Too Lean (Bank 1) — Diagnosis & Fix Guide (2026) P0172 P0172 Code: System Too Rich (Bank 1) — Diagnosis & Fix Guide (2026) P0174 P0174 Code: System Too Lean (Bank 2) — Diagnosis & Fix Guide (2026) P0175 P0175 Code: System Too Rich (Bank 2) — Diagnosis & Fix Guide (2026) P1101 P1101 Code — Intake Airflow System Performance (Causes & How to Fix) P1135 P1135 Code: Air/Fuel Ratio Sensor Heater Circuit Response (Bank 1) — Diagnosis & Fix Guide (2026) P2015 P2015 Code — Intake Manifold Runner Position Sensor (Is It Serious? How to Fix) SYMPTOM-BAD-GAS-MILEAGE SYMPTOM-BAD-GAS-MILEAGE Code: Bad Gas Mileage — Why Your MPG Dropped and How to Fix — Diagnosis & Fix Guide (2026) SYMPTOM-BLACK-SMOKE SYMPTOM-BLACK-SMOKE Code — Black smoke from exhaust — running rich diagnosis (Causes & How to Fix) SYMPTOM-HARD-START SYMPTOM-HARD-START Code — Car hard to start — takes multiple tries to turn over (Causes & How to Fix) P0300 P0300 Code — Random/Multiple Cylinder Misfire Detected (Causes & How to Fix) P0301 P0301 Code — Cylinder 1 Misfire Detected (Causes & How to Fix) P0302 P0302 Code — Cylinder 2 Misfire Detected (Is It Serious? How to Fix) P0303 P0303 Code — Cylinder 3 Misfire Detected (Causes & How to Fix) P0304 P0304 Code — Cylinder 4 Misfire Detected (Causes & How to Fix) P0305 P0305 – Cylinder 5 Misfire Detected (Causes, Diagnosis & Repair) P0306 P0306 Code — Cylinder 6 Misfire Detected (Is It Serious? How to Fix) P0307 P0307 Code — Cylinder 7 Misfire Detected (Causes & How to Fix) P0308 P0308 Code — Cylinder 8 Misfire Detected (Causes, Costs & Fix‑It Guide) P0325 P0325 Code — Knock Sensor 1 Circuit Malfunction (Bank 1) (Causes & How to Fix) P0330 P0330 Code — Knock Sensor 2 Circuit Malfunction (Bank 2) (Causes & How to Fix) P0335 P0335 Code — Crankshaft Position Sensor A Circuit Malfunction (Causes & How to Fix) P0336 P0336 Code — Crankshaft Position Sensor A Circuit Range/Performance (Causes & How to Fix) P0341 P0341 Code — Camshaft Position Sensor Circuit Range/Performance (Bank 1) (Causes & How to Fix) P0345 P0345 Code — Camshaft Position Sensor A Circuit Malfunction (Bank 2) – Causes, Diagnosis & Repair P0352 P0352 Code — Ignition Coil B Primary/Secondary Circuit Malfunction (Causes & How to Fix) P0353 P0353 Code — Ignition Coil C Primary/Secondary Circuit Malfunction (Causes & How to Fix) P0354 P0354 Code — Ignition Coil D Primary/Secondary Circuit Malfunction (Causes & How to Fix) SYMPTOM-ROUGH-IDLE SYMPTOM-ROUGH-IDLE Code — Car rough idle — causes, diagnosis, and fixes (Causes & How to Fix) SYMPTOM-WONT-START SYMPTOM-WONT-START Code — Car won't start — clicking noise, no crank troubleshooting (Causes & How to Fix)