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B0100 B0100 Code: Electronic Frontal Sensor 1 Malfunction — Comprehensive Diagnosis & Fix Guide B1000 B1000 Code: ECU Malfunction – Internal Fault (2026) – Diagnosis, Repair & Cost Guide B1342 B1342 Code: ECU Hardware Internal Failure — Diagnosis & Fix Guide (2026) B1318 B1318 Code: Battery Voltage Low — Diagnosis & Fix Guide (2026) B1325 B1325 Code – Battery Voltage Out of Range: Full Diagnosis & Repair Guide B1600 B1600 Code: PATS Received Incorrect Key Code — Comprehensive Diagnosis & Fix Guide B2799 B2799 Code: Immobilizer System Malfunction — Diagnosis & Fix Guide (2026) C0035 C0035 Code — Left Front Wheel Speed Sensor Circuit Malfunction — Diagnosis & Fix Guide (2026) C0040 C0040 Code: Right Front Wheel Speed Sensor Circuit Malfunction — Diagnosis & Fix Guide (2026) C0045 C0045 Code – Left Rear Wheel Speed Sensor Circuit Malfunction (2026 Guide) C0050 C0050 Code: Rear Wheel Speed Sensor Circuit Malfunction — Diagnosis & Repair Guide (2026) C0055 C0055 Code: Right Rear Wheel Speed Sensor Circuit Malfunction — Diagnosis & Fix Guide C0561 C0561 Code: System Disabled Information Stored — Diagnosis & Fix Guide (2026) C1201 C1201 Code: Engine Control System Malfunction (Traction Control) – Diagnosis & Repair Guide U0073 U0073 Code: Control Module Communication Bus A Off — Diagnosis & Fix Guide (2026) U0100 U0100 Code — Lost Communication with ECM/PCM — Causes, Cost & DIY Fix (2026) U0101 U0101 Code — Lost Communication with TCM — Diagnosis & Repair Guide (2026) U0121 U0121 Code – Lost Communication with ABS Control Module – Complete Diagnosis & Repair Guide (2026) U0126 U0126 Code: Lost Communication with Steering Angle Sensor Module — Diagnosis & Fix Guide (2026) U0128 U0128 Code: Lost Communication with Park Brake Control Module — Diagnosis & Fix Guide (2026) U0140 U0140 Code: Lost Communication with Body Control Module — Diagnosis & Fix Guide (2026) U0155 U0155 Code – Lost Communication with Instrument Panel Cluster | Diagnosis, Costs & DIY Fix U1000 U1000 Code – CAN Communication Bus Malfunction: Full Diagnosis, Repair & Cost Guide (2026) P0480 P0480 Code: Cooling Fan 1 Control Circuit Malfunction — Diagnosis & Repair Guide P0563 P0563 Code: System Voltage High — Diagnosis, Repair & Cost Guide (2026) P0600 P0600 Code: Serial Communication Link Malfunction — Diagnosis & Fix Guide (2026) P0601 P0601 Code — Internal Control Module Memory Check Sum Error — Diagnosis & Fix Guide (2026) P0603 P0603 Code: Internal Control Module KAM (Keep‑Alive Memory) Error – Diagnosis, Cost & Repair Guide (2026) P0604 P0604 Code: Internal Control Module RAM Error – Full Diagnosis & Repair Guide (2026) P0605 P0605 Code — Internal Control Module ROM Error — Diagnosis & Fix Guide (2026) P0606 P0606 Code — ECM/PCM Processor Fault — Diagnosis & Fix Guide (2026) P1000 P1000 Code: OBD‑II Monitor Testing Not Complete — Diagnosis & Fix Guide (2026) P1684 P1684 Code — Battery Was Recently Disconnected – Meaning, Causes, Cost & DIY Repair (2026) 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 Excessive Flow Fix (2026) P0410 P0410 Code — Secondary Air Injection System Malfunction (Causes, Diagnosis & Repair) P0411 P0411 Code: Fix Secondary Air Injection Flow Issue P0420 P0420 Code — Catalyst System Efficiency Below Threshold (Causes & How to Fix) P0421 P0421 Code — Warm Up Catalyst Efficiency Below Threshold (Bank 1) (Causes & How to Fix) (2026) P0430 P0430 Code — Catalyst System Efficiency Below Threshold (Bank 2) (Causes & How to Fix) P0440 P0440 Code — EVAP Emission Control System Malfunction (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 Fix Guide 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) P0457 P0457 Code — EVAP System Leak (Fuel Cap Loose/Off) (Causes, Cost & How to Fix) (2026) P0496 P0496 Code — EVAP High Purge Flow Fix P0498 P0498 Code: EVAP System Vent Valve Control Circuit Low — Diagnosis & Fix Guide (2026) P1456 P1456 Code — EVAP System Gross Leak (Fuel Tank) (Causes & How to Fix) P1457 P1457 Code — Honda EVAP Canister Leak Fix (2026) P2002 P2002 Code — Diesel Particulate Filter Efficiency Below Threshold (Causes, Cost & How to Fix) P2096 P2096 Code: Post-Catalyst Fuel Trim System Too Lean (Bank 1) — Diagnosis & Fix Guide (2026) P2097 P2097 Code — Post‑Catalyst Fuel Trim System Too Rich (Bank 1) — Diagnosis & Repair Guide (2026) P2440 P2440 Code: Secondary Air Injection Switching Valve Stuck Open (Bank 1) — Diagnosis & Fix Guide (2026) 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) P0521 P0521 Code — Oil Pressure Sensor/Switch Range/Performance (Causes, Cost & How to Fix) 2026 P0522 P0522 Code: Engine Oil Pressure Sensor/Switch Low Voltage – Diagnosis, Repair & Safety Guide P0523 P0523 Code: Engine Oil Pressure Sensor/Switch High Voltage – Diagnosis, Repair & Cost Guide (2026) 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-TEMP-GAUGE-HIGH SYMPTOM-TEMP-GAUGE-HIGH Code: Temperature gauge reads high but not overheating — sensor issues — Diagnosis & Fix Guide (2026) SYMPTOM-WHITE-SMOKE SYMPTOM-WHITE-SMOKE Code: White Smoke from Exhaust — Causes, Severity, and Repair Guide P0030 P0030 Code — O2 Sensor Heater B1S1 Fix P0036 P0036 Code — HO2S Heater Control Circuit (Bank 1, Sensor 2) — Diagnosis & Fix Guide (2026) P0056 P0056 Code: O2 Sensor Heater Fix (Bank 2, Sensor 2) 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 — MAF Sensor High Input Fix (2026) 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 Low Voltage (Bank 1) Fix P0133 P0133 Code: O2 Sensor Circuit Slow Response (Bank 1, Sensor 1) — Diagnosis & Fix Guide (2026) P0134 P0134 Code: O₂ Sensor Circuit No Activity Detected (Bank 1 Sensor 1) – Diagnosis & Repair Guide 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) P0139 P0139 Code — O₂ Sensor Circuit Slow Response (Bank 1 Sensor 2) — Diagnosis & Repair Guide P0140 P0140 O₂ Sensor Circuit No Activity Detected (Bank 1 Sensor 2) – Meaning, Diagnosis & DIY Fix P0141 P0141 Code — O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2) (Causes & How to Fix) P0154 P0154 Code: O₂ Sensor Circuit No Activity Detected (Bank 2 Sensor 1) – Diagnosis & Repair Guide 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) P0160 P0160 Code: O₂ Sensor Circuit No Activity Detected (Bank 2 Sensor 2) – Complete Diagnosis & Repair Guide 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) P0193 P0193 Code: Fuel Rail Pressure Sensor Circuit High Input — Diagnosis & Fix Guide (2026) P0205 P0205 Code: Cylinder 5 Injector Circuit Malfunction – Complete Diagnosis & Repair Guide P1101 P1101 Code: Fix Chevy/GMC Intake Airflow in 20 Min P1133 P1133 Code — HO2S Insufficient Switching (Bank 1, Sensor 1) – Full Diagnosis & Repair Guide P1135 P1135 Code: Air/Fuel Ratio Sensor Heater Circuit Response (Bank 1) — Diagnosis & Fix Guide (2026) P1166 P1166 Code — A/F Sensor Heater Circuit Range/Performance (Bank 1) — Diagnosis & Fix Guide (2026) P2015 P2015 Code — Intake Manifold Runner Position Sensor (Is It Serious? How to Fix) P2188 P2188 Code – System Too Rich at Idle (Bank 1) – Complete Diagnosis & Repair Guide P2195 P2195 Code: O₂ Sensor Signal Stuck Lean (Bank 1 Sensor 1) – Diagnosis, Repair & Cost Guide 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) SYMPTOM-LOSS-POWER SYMPTOM-LOSS-POWER Code: Car Losing Power While Driving – Causes, Diagnosis, and Fixes (2026) SYMPTOM-STALLING SYMPTOM-STALLING Code: Car stalling — why your car keeps shutting off — Diagnosis & Fix Guide (2026) P0087 P0087 Code — Fuel Rail/System Pressure Too Low (Causes, Costs & DIY Fixes) (2026) P0200 P0200 Code: Injector Circuit Malfunction — Diagnosis, Repair & Cost Guide (2026) P0201 P0201 Code: Injector Circuit Malfunction – Cylinder 1 – Full Diagnosis & Repair Guide (2026) P0217 P0217 Code: Engine Overtemperature Condition — Diagnosis & Fix Guide (2026) P0218 P0218 Code: Transmission Over Temperature Condition — Diagnosis & Fix Guide (2026) P0230 P0230 Code — Fuel Pump Primary Circuit Malfunction — Diagnosis & Fix Guide (2026) P0234 P0234 Code: Turbocharger/Supercharger Overboost Condition — Diagnosis & Fix Guide (2026) P0299 P0299 Turbocharger/Supercharger Underboost Condition — Causes, Cost & DIY Fix (2026) 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) P0316 P0316 Code — Misfire Detected on Startup (First 1000 Revolutions) (Causes, Cost & How to Fix) (2026) P0325 P0325 Code — Knock Sensor 1 Circuit Malfunction (Bank 1) (Causes & How to Fix) P0326 P0326 Code — Knock Sensor 1 Circuit Range/Performance (Bank 1) – Diagnosis, Repair & Cost Guide P0330 P0330 Code — Knock Sensor 2 Circuit Fix (2026) P0332 P0332 Code — Knock Sensor 2 Circuit Low Input (Bank 2) – Causes, Costs & Repair Guide 2026 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) P0340 P0340 Camshaft Position Sensor Circuit Malfunction (Bank 1) — Causes, Cost & DIY Fix (2026) 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 P0351 P0351 Code – Ignition Coil A Primary/Secondary Circuit Malfunction – Full Diagnosis & Repair Guide 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) P0355 P0355 Code — Ignition Coil E Primary/Secondary Circuit Malfunction (Causes, Cost & DIY Fix) (2026) P0356 P0356 Ignition Coil F Primary/Secondary Circuit Malfunction — Causes, Cost & DIY Fix (2026) P0357 P0357 Code – Ignition Coil G Primary/Secondary Circuit Malfunction – Full Diagnosis & Repair Guide (2026) P0358 P0358 Code: Ignition Coil H Primary/Secondary Circuit Malfunction — Diagnosis & Fix Guide (2026) P1345 P1345 Code — Crankshaft/Camshaft Correlation (CKP/CMP) (Causes & How to Fix) (2026) P2647 P2647 Code: VTEC Rocker Arm Oil Pressure Switch Circuit High (Bank 1) — Diagnosis & Fix Guide (2026) 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) P0500 P0500 Code – Vehicle Speed Sensor Malfunction: Full Diagnosis & Repair Guide (2026) P0505 P0505 Code: Idle Control System Malfunction — Diagnosis & Fix Guide (2026) P0506 P0506 Code — Idle Control System RPM Lower Than Expected (Causes, Cost & DIY Fix) (2026) P0507 P0507 Code — Idle Control System RPM Higher Than Expected (Causes, Cost & DIY Fix) (2026) P0520 P0520 Code: Engine Oil Pressure Sensor/Switch Circuit Malfunction — Diagnosis & Repair Guide (2026) P0562 P0562 Code: System Voltage Low — Diagnosis & Fix Guide (2026) P0700 P0700 Code — Transmission Control System Malfunction (Causes, Cost & How to Fix) P0705 P0705 Code — Transmission Range Sensor (PRNDL Input) Malfunction – Meaning, Causes, Cost & DIY Repair (2026) P0715 P0715 Code — Input/Turbine Speed Sensor Circuit Malfunction — Diagnosis & Fix Guide (2026) P0720 P0720 Code — Output Speed Sensor Circuit Malfunction — Causes, Cost & DIY Fix (2026) P0730 P0730 Code: Incorrect Gear Ratio — Diagnosis, Repair & Cost Guide (2026) P0732 P0732 Code: Gear 2 Incorrect Ratio — Diagnosis, Repair & Cost Guide (2026) P0734 P0734 Code — Gear 4 Incorrect Ratio — Diagnosis & Fix Guide (2026) P0740 P0740 Code: Torque Converter Clutch Circuit Malfunction — Diagnosis, Repair & Cost Guide (2026) P0741 P0741 – Torque Converter Clutch Circuit Performance or Stuck Off (Causes, Diagnosis, Cost & Repair Guide 2026) P0746 P0746 Code — Pressure Control Solenoid Performance/Stuck Off — Diagnosis & Fix Guide (2026) P0750 P0750 Code — Shift Solenoid A Malfunction — Diagnosis, Repair & Driving Guidance (2026) P0755 P0755 Code — Shift Solenoid B Malfunction — Diagnosis & Repair Guide (2026) P0868 P0868 Code — Transmission Fluid Pressure Low — Diagnosis & Repair Guide (2026) P1800 P1800 Code: CVT Control Valve Circuit Malfunction — Diagnosis & Repair Guide (2026) SYMPTOM-HARD-SHIFTING SYMPTOM-HARD-SHIFTING Code: Car Shifting Hard or Jerking — Transmission Diagnosis & Fix Guide (2026) SYMPTOM-SLIPPING-TRANS SYMPTOM-SLIPPING-TRANS Transmission slipping — causes and repair costs — Causes, Cost & DIY Fix (2026) SYMPTOM‑WONT‑SHIFT SYMPTOM‑WONT‑SHIFT Code: Car Stuck in One Gear – Limp Mode Explained, Diagnosis & Fix Guide (2026)