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🔴 Tier 1 — High Traffic Codes (25)
P0171System Too Lean (Bank 1)→
P0420Catalyst Efficiency (Bank 1)→
P0300Random Misfire Detected→
P0442Small EVAP Leak→
P0455Large EVAP Leak→
P0301Cylinder 1 Misfire→
P0302Cylinder 2 Misfire→
P0303Cylinder 3 Misfire→
P0304Cylinder 4 Misfire→
P0128Thermostat Running Cold→
P0430Catalyst Efficiency (Bank 2)→
P0172System Too Rich (Bank 1)→
P0401EGR Flow Insufficient→
P0113IAT Sensor Circuit High→
P0101MAF Sensor Range/Performance→
P0340Camshaft Position Sensor→
P0335Crankshaft Position Sensor→
P0456Very Small EVAP Leak→
P0446EVAP Vent Control Circuit→
P0411Secondary Air Injection→
P0174System Too Lean (Bank 2)→
P0175System Too Rich (Bank 2)→
P0135O2 Heater (Bank 1, S1)→
P0138O2 High Voltage (Bank 1, S2)→
P0141O2 Heater (Bank 1, S2)→
🟠 Tier 2 — Sensor & Electrical (25)
P0440EVAP System Malfunction→
P0404EGR Circuit Range/Performance→
P0305Cylinder 5 Misfire→
P0306Cylinder 6 Misfire→
P0320Engine Speed Input Circuit→
P0325Knock Sensor 1 Circuit→
P0330Knock Sensor 2 Circuit→
P0131O2 Low Voltage (Bank 1, S1)→
P0132O2 High Voltage (Bank 1, S1)→
P0133O2 Slow Response (Bank 1, S1)→
P0136O2 Circuit (Bank 1, S2)→
P0151O2 Low Voltage (Bank 2, S1)→
P0152O2 High Voltage (Bank 2, S1)→
P0155O2 Heater (Bank 2, S1)→
P0161O2 Heater (Bank 2, S2)→
P0102MAF Sensor Low Input→
P0103MAF Sensor High Input→
P0111IAT Sensor Range/Performance→
P0112IAT Sensor Low Input→
P0116Coolant Temp Circuit Range→
P0117Coolant Temp Circuit Low→
P0118Coolant Temp Circuit High→
P0121TPS Circuit Range/Performance→
P0122TPS Circuit Low Input→
P0123TPS Circuit High Input→
🟡 Tier 3 — Internal & Transmission (30)
P0201Injector Circuit (Cylinder 1)→
P0202Injector Circuit (Cylinder 2)→
P0203Injector Circuit (Cylinder 3)→
P0204Injector Circuit (Cylinder 4)→
P0261Injector Low (Cylinder 1)→
P0264Injector Low (Cylinder 2)→
P0267Injector Low (Cylinder 3)→
P0270Injector Low (Cylinder 4)→
P0341Camshaft Sensor Range (B1)→
P0345Camshaft Sensor (Bank 2)→
P0336Crankshaft Sensor Range→
P0351Ignition Coil A Circuit→
P0352Ignition Coil B Circuit→
P0353Ignition Coil C Circuit→
P0354Ignition Coil D Circuit→
P0521Oil Pressure Sensor Range→
P0522Oil Pressure Sensor Low→
P0562System Voltage Low→
P0563System Voltage High→
P0601ECM Memory Checksum Error→
P0606ECM/PCM Processor Fault→
P0700Transmission Control System→
P0705Transmission Range Sensor→
P0715Input Speed Sensor Circuit→
P0720Output Speed Sensor Circuit→
P0731Gear 1 Incorrect Ratio→
P0732Gear 2 Incorrect Ratio→
P0733Gear 3 Incorrect Ratio→
P0740Torque Converter Clutch→
P0741TCC Circuit Performance→
🟢 Tier 4 — Actuators & Specialized (20)
P0010Camshaft Actuator (Bank 1)→
P0011Camshaft Over-Advanced (B1)→
P0012Camshaft Over-Retarded (B1)→
P0013Exhaust Cam Actuator (B1)→
P0014Exhaust Cam Over-Advanced→
P0016Crank/Cam Correlation (Intake)→
P0017Crank/Cam Correlation (Exhaust)→
P0087Fuel Rail Pressure Too Low→
P0088Fuel Rail Pressure Too High→
P0089Fuel Pressure Regulator→
P0183Fuel Temp Sensor High→
P0217Engine Overtemperature→
P0218Transmission Overtemperature→
P0380Glow Plug Circuit (Diesel)→
P0299Turbo/Supercharger Underboost→
P0403EGR Valve Circuit→
P0405EGR Sensor A Circuit Low→
P0496EVAP High Purge Flow→
P0505Idle Control System→
P0507Idle RPM Too High→