Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Infiniti FX45FACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| DTC | CONSULT-II Display | System/Circuit Affected | ||||
|---|---|---|---|---|---|---|
| P0000 | ----- | No Malfunction/Normal Condition | ||||
| P0011 | INT/V TIM CONT-B1 | Intake Valve Timing Control Performance (Bank 1) | ||||
| P0021 | INT/V TIM CONT-B2 | Intake Valve Timing Control Performance (Bank 2) | ||||
| P0031 | HO2S1 HTR (B1) | Heated Oxygen Sensor 1 Heater Control Circuit Low (Bank 1) | ||||
| P0032 | HO2S1 HTR (B1) | Heated Oxygen Sensor 1 Heater Control Circuit High (Bank 1) | ||||
| P0037 | HO2S2 HTR (B1) | Heated Oxygen Sensor 2 Heater Control Circuit Low (Bank 1) | ||||
| P0038 | HO2S2 HTR (B1) | Heated Oxygen Sensor 2 Heater Control Circuit High (Bank 1) | ||||
| P0051 | HO2S1 HTR (B2) | Heated Oxygen Sensor 1 Heater Control Circuit Low (Bank 2) | ||||
| P0052 | HO2S1 HTR (B2) | Heated Oxygen Sensor 1 Heater Control Circuit High (Bank 2) | ||||
| P0057 | HO2S2 HTR (B2) | Heated Oxygen Sensor 2 Heater Control Circuit Low (Bank 2) | ||||
| P0058 | HO2S2 HTR (B2) | Heated Oxygen Sensor 2 Heater Control Circuit High (Bank 2) | ||||
| P0101 | MAF SEN/CIRCUIT | Mass Airflow Sensor Circuit Range/Performance Problem | ||||
| P0102 | MAF SEN/CIRCUIT | Mass Air Flow Sensor Circuit Low Input | ||||
| P0103 | MAF SEN/CIRCUIT | Mass Air Flow Sensor Circuit High Input | ||||
| P0112 | IAT SEN/CIRCUIT | Intake Air Temperature Sensor Circuit Low Input | ||||
| P0113 | IAT SEN/CIRCUIT | Intake Air Temperature Sensor Circuit High Input | ||||
| P0117 | ECT SEN/CIRCUIT | Engine Coolant Temperature Sensor Circuit Low Input | ||||
| P0118 | ECT SEN/CIRCUIT | Engine Coolant Temperature Sensor Circuit High Input | ||||
| P0122 | TP SEN 2/CIRC | Throttle Position Sensor No. 2 Circuit Low Input | ||||
| P0123 | TP SEN 2/CIRC | Throttle Position Sensor No. 2 Circuit High Input | ||||
| P0125 | ECT SENSOR | Insufficient Engine Coolant Temperature For Closed Loop Fuel Control | ||||
| P0127 | IAT SENSOR | Intake Air Temperature Too High | ||||
| P0128 | THERMSTAT FNCTN | Thermostat Function | ||||
| P0132 | HO2S1 (B1) | Heated oxygen sensor 1 circuit high voltage (Bank 1) | ||||
| P0133 | HO2S1 (B1) | Heated Oxygen Sensor 1 Circuit Slow Response (Bank 1) | ||||
| P0134 | HO2S1 (B1) | Heated Oxygen Sensor 1 Circuit No Activity Detected (Bank 1) | ||||
| P0138 | HO2S2 (B1) | Heated Oxygen Sensor 2 Circuit High Voltage (Bank 1) | ||||
| P0139 | HO2S2 (B1) | Heated Oxygen Sensor 2 Circuit Slow Response (Bank 1) | ||||
| P0152 | HO2S1 (B2) | Heated oxygen sensor 1 circuit high voltage (Bank 2) | ||||
| P0153 | HO2S1 (B2) | Heated Oxygen Sensor 1 Circuit Slow Response (Bank 2) | ||||
| P0154 | HO2S1 (B2) | Heated Oxygen Sensor 1 Circuit No Activity Detected (Bank 2) | ||||
| P0158 | HO2S2 (B2) | Heated Oxygen Sensor 2 Circuit High Voltage (Bank 2) | ||||
| P0159 | HO2S2 (B2) | Heated Oxygen Sensor 2 Circuit Slow Response (Bank 2) | ||||
| P0171 | FUEL SYS-LEAN-B1 | Fuel Injection System Too Lean (Bank 1) | ||||
| P0172 | FUEL SYS-RICH-B1 | Fuel Injection System Too Rich (Bank 1) | ||||
| P0174 | FUEL SYS-LEAN-B2 | Fuel Injection System Too Lean (Bank 2) | ||||
| P0175 | FUEL SYS-RICH-B2 | Fuel Injection System Too Rich (Bank 2) | ||||
| P0181 | FTT SENSOR | Fuel Tank Temperature Sensor Circuit Range/Performance | ||||
| P0182 | FTT SEN/CIRCUIT | Fuel Tank Temperature Sensor Circuit Low Input | ||||
| P0183 | FTT SEN/CIRCUIT | Fuel Tank Temperature Sensor Circuit High Input | ||||
| P0222 | TP SEN 1/CIRC | Throttle Position Sensor 1 Circuit Low Input | ||||
| P0223 | TP SEN 1/CIRC | Throttle Position Sensor 1 Circuit High Input | ||||
| P0300 | MULTI CYL MISFIRE | Multiple Cylinder Misfire | ||||
| P0301 | CYL 1 MISFIRE | No. 1 Cylinder Misfires | ||||
| P0302 | CYL 2 MISFIRE | No. 2 Cylinder Misfires | ||||
| P0303 | CYL 3 MISFIRE | No. 3 Cylinder Misfires | ||||
| P0304 | CYL 4 MISFIRE | No. 4 Cylinder Misfires | ||||
| P0305 | CYL 5 MISFIRE | No. 5 Cylinder Misfires | ||||
| P0306 | CYL 6 MISFIRE | No. 6 Cylinder Misfires | ||||
| P0307 | CYL 7 MISFIRE | No. 7 Cylinder Misfires | ||||
| P0308 | CYL 8 MISFIRE | No. 8 Cylinder Misfires | ||||
| P0327 | KNOCK SEN/CIRC-B1 | Knock Sensor Circuit Low Input (Bank 1) | ||||
| P0328 | KNOCK SEN/CIRC-B1 | Knock Sensor Circuit High Input (Bank 1) | ||||
| P0332 | KNOCK SEN/CIRC-B2 | Knock Sensor Circuit Low Input (Bank 2) | ||||
| P0333 | KNOCK SEN/CIRC-B2 | Knock Sensor Circuit High Input (Bank 2) | ||||
| P0335 | CKP SEN/CIRCUIT | Crankshaft Position Sensor (POS) Circuit | ||||
| P0340 | CMP SEN/CIRC-B1 | Camshaft Position Sensor (Phase) Circuit | ||||
| P0420 | TW CATALYST SYS-B1 | Catalyst System Efficiency Below Threshold (Bank 1) | ||||
| P0430 | TW CATALYST SYS-B2 | Catalyst System Efficiency Below Threshold (Bank 2) | ||||
| P0441 | EVAP PURG FLOW/MON | EVAP Control System Incorrect Purge Flow | ||||
| P0442 | EVAP SMALL LEAK | EVAP Control System Small Leak Detected (Negative Pressure) | ||||
| P0444 | PURG VOLUME CONT/V | EVAP Canister Purge Volume Control Solenoid Valve Circuit Open |
||||
| P0445 | PURG VOLUME CONT/V | EVAP Canister Purge Volume Control Solenoid Valve Circuit Shorted | ||||
| P0447 | VENT CONTROL VALVE | EVAP Canister Vent Control Valve Circuit Open | ||||
| P0451 | EVAP SYS PRES SEN | EVAP Control System Pressure Sensor Performance | ||||
| P0452 | EVAP SYS PRES SEN | EVAP Control System Pressure Sensor Low Input | ||||
| P0453 | EVAP SYS PRES SEN | EVAP Control System Pressure Sensor High Input | ||||
| P0455 | EVAP GROSS LEAK | EVAP Control System Gross Leak Detected | ||||
| P0456 | EVAP VERY SML LEAK | Evaporative Emission Control System Very Small Leak (Negative Pressure Check) | ||||
| P0460 | FUEL LEV SEN SLOSH | Fuel Level Sensor Circuit Noise | ||||
| P0461 | FUEL LEVEL SENSOR | Fuel Level Sensor Circuit Range/Performance | ||||
| P0462 | FUEL LEVL SEN/CIRC | Fuel Level Sensor Circuit Low Input | ||||
| P0463 | FUEL LEVL SEN/CIRC | Fuel Level Sensor Circuit High Input | ||||
| P0500 | VEH SPEED SEN/CIRC | Vehicle Speed Sensor | ||||
| P0506 | ISC SYSTEM | Idle Speed Control System RPM Lower Than Expected | ||||
| P0507 | ISC SYSTEM | Idle Speed Control System RPM Higher Than Expected | ||||
| P0550 | PW ST P SEN/CIRC | Power Steering Pressure Sensor Circuit | ||||
| P0605 | ECM | Engine Control Module | ||||
| P0705 | PNP SW/CIRC | (1) | ||||
| P0710 | ATF TEMP SEN/CIRC | (1) | ||||
| P0720 | VEH SPD SEN/CIR AT | (1) | ||||
| P0740 | TCC SOLENOID/CIRC | (1) | ||||
| P0744 | A/T TCC S/V FNCTN | (1) | ||||
| P0745 | L/PRESS SOL/CIRC | (1) | ||||
| P1065 | ECM BACK UP/CIRC | ECM Power Supply Circuit | ||||
| P1102 | MAF SENSOR | Mass Air flow Sensor Circuit Range/Performance Problem | ||||
| P1111 | INT/V TIM V/CIR-B1 | Intake Valve Timing Control Solenoid Valve Circuit (Bank 1) | ||||
| P1121 | ETC ACTR | Electric Throttle Control Actuator | ||||
| P1122 | ETC FUNCTION/CIRC | Electric Throttle Control Function Performance Problem | ||||
| P1124 | ETC MOT PWR | Throttle Control Motor Relay Circuit Short | ||||
| P1126 | ETC MOT PWR | Throttle Control Motor Relay Circuit Open | ||||
| P1128 | ETC MOT | Throttle Control Motor Circuit Short | ||||
| P1136 | INT/V TIM V/CIR-B2 | Intake Valve Timing Control Solenoid Valve Circuit (Bank 2) | ||||
| P1140 | INTK TIM S/CIRC-B1 | Intake Valve Timing Control Position Sensor Circuit (Bank 1) | ||||
| P1143 | HO2S1 (B1) | Heated Oxygen Sensor 1 Lean Shift Monitoring (Bank 1) | ||||
| P1144 | HO2S1 (B1) | Heated Oxygen Sensor 1 Rich Shift Monitoring (Bank 1) | ||||
| P1145 | INTK TIM S/CIRC-B2 | Intake Valve Timing Control Position Sensor Circuit (Bank 2) | ||||
| P1146 | HO2S2 (B1) | Heated Oxygen Sensor 2 Minimum Voltage Monitoring (Bank 1) | ||||
| P1147 | HO2S2 (B1) | Heated Oxygen Sensor 2 Maximum Voltage Monitoring (Bank 1) | ||||
| P1148 | CLOSED LOOP-B1 | Closed Loop Control Function (Bank 1) | ||||
| P1163 | HO2S1 (B2) | Heated Oxygen Sensor 1 Lean Shift Monitoring (Bank 2) | ||||
| P1164 | HO2S1 (B2) | Heated Oxygen Sensor 1 Rich Shift Monitoring (Bank 2) | ||||
| P1166 | HO2S2 (B2) | Heated Oxygen Sensor 2 Minimum Voltage Monitoring (Bank 2) | ||||
| P1167 | HO2S2 (B2) | Heated Oxygen Sensor 2 Maximum Voltage Monitoring (Bank 2) | ||||
| P1168 | CLOSED LOOP-B2 | Closed Loop Control Function (Bank 2) | ||||
| P1211 | TCS C/U FUNCTN | TCS Control Unit | ||||
| P1212 | TCS/CIRC | TCS Communication Line | ||||
| P1217 | ENG OVER TEMP | Engine Over Temperature (Overheat) | ||||
| P1225 | CTP LEARNING | Closed Throttle Position Learning Performance Problem | ||||
| P1226 | CTP LEARNING | Closed Throttle Position Learning Performance Problem | ||||
| P1229 | SENSOR POWER/CIRC | Sensor Power Supply Circuit Short | ||||
| P1444 | PURG VOLUME CONT/V | EVAP Canister Purge Volume Control Solenoid Valve | ||||
| P1446 | VENT CONTROL VALVE | EVAP Canister Vent Control Valve Close | ||||
| P1564 | ASCD SW | ICC Steering Switch | ||||
| P1564 | ASCD SW | ASCD Steering Switch | ||||
| P1568 | ACC COMMAND VALUE | ICC Function | ||||
| P1572 | ASCD BRAKE SW | ICC Brake Switch | ||||
| P1572 | ASCD BRAKE SW | ASCD Brake Switch | ||||
| P1574 | ASCD VHL SPD SEN | ICC Vehicle Speed Sensor | ||||
| P1574 | ASCD VHL SPD SEN | ASCD Vehicle Speed Sensor | ||||
| P1610-P1615 | NATS MALFUNCTION | (2) | ||||
| P1706 | P-N POS SW/CIRCUIT | Park/Neutral Position Switch | ||||
| P1716 | TURBINE REV S/CIRC | (1) | ||||
| P1720 | V/SP SEN (A/T OUT) | Vehicle Speed Sensor (A/T Output) | ||||
| P1730 | A/T INTERLOCK | (1) | ||||
| P1752 | I/C SOLENOID/CIRC | (1) | ||||
| P1754 | I/C SOLENOID FNCTN | (1) | ||||
| P1757 | FR/B SOLENOID/CIRC | (1) | ||||
| P1759 | FR/B SOLENOID/CIRC | (1) | ||||
| P1762 | D/C SOLENOID/CIRC | (1) | ||||
| P1764 | D/C SOLENOID FNCTN | (1) | ||||
| P1767 | HLR/C SOL/CIRC | (1) | ||||
| P1769 | HLR/C SOL FNCTN | (1) | ||||
| P1772 | LC/B SOLENOID/CIRC | (1) | ||||
| P1774 | LC/B SOLENOID FNCT | (1) | ||||
| P1780 | SHIFT SIG FNCTN | Shift Change Signal | ||||
| P1805 | BRAKE SW/CIRCUIT | Brake Switch | ||||
| P2122 | APP SEN 1/CIRC | Accelerator Pedal Position Sensor 1 Circuit Low Input | ||||
| P2123 | APP SEN 1/CIRC | Accelerator Pedal Position Sensor 1 Circuit High Input | ||||
| P2127 | APP SEN 2/CIRC | Accelerator Pedal Position Sensor 2 Circuit Low Input | ||||
| P2128 | APP SEN 2/CIRC | Accelerator Pedal Position Sensor 2 Circuit High Input | ||||
| P2135 | TP SENSOR | Throttle Position Sensor Circuit Range/Performance Problem | ||||
| P2138 | APP SENSOR | Accelerator Pedal Position Sensor Circuit Range/Performance Problem | ||||
| U1000 | CAN COMM CIRCUIT | CAN Communication Line | ||||
| U1001 | CAN COMM CIRCUIT | CAN Communication Line | ||||
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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