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.
2001 Mazda Millenia PFACTORY OEM SERVICE PROCEDURE
Engine Performance (2.3L) DTCS
ENGINE PERFORMANCE (2.3L) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| P0100 | MASS AIRFLOW METER (MAF) CIRCUIT MALFUNCTION |
| P0105 | MANIFOLD ABSOLUTE PRESSURE (MAP) CIRCUIT MALFUNCTION |
| P0110 | AIR CLEANER INTAKE AIR TEMPERATURE (IAT) CIRCUIT MALFUNCTION |
| P0115 | ENGINE COOLANT TEMPERATURE (ECT) CIRCUIT MALFUNCTION |
| P0120 | THROTTLE POSITION (TP) CIRCUIT MALFUNCTION |
| P0125 | INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL |
| P0130 | RIGHT FRONT HEATED OXYGEN SENSOR (HO2S) CIRCUIT MALFUNCTION |
| P0134 | RIGHT FRONT HO2S CIRCUIT, NO ACTIVITY DETECTED |
| P0135 | RIGHT FRONT HO2S HEATER CIRCUIT MALFUNCTION |
| P0138 | RIGHT REAR HO2S CIRCUIT, HIGH INPUT |
| P0140 | RIGHT REAR HO2S CIRCUIT, NO ACTIVITY DETECTED |
| P0141 | RIGHT REAR HO2S HEATER CIRCUIT MALFUNCTION |
| P0150 | LEFT FRONT HO2S CIRCUIT MALFUNCTION |
| P0154 | LEFT FRONT HO2S CIRCUIT, NO ACTIVITY DETECTED |
| P0155 | LEFT FRONT HO2S HEATER CIRCUIT MALFUNCTION |
| P0158 | LEFT REAR HO2S CIRCUIT, HIGH INPUT |
| P0160 | LEFT REAR HO2S CIRCUIT, NO ACTIVITY DETECTED |
| P0161 | LEFT REAR HO2S HEATER CIRCUIT MALFUNCTION |
| P0170 | BANK NO. 1 - RIGHT BANK FUEL TRIM MALFUNCTION |
| P0173 | BANK NO. 2 - LEFT BANK FUEL TRIM MALFUNCTION |
| P0300 | RANDOM MISFIRE DETECTED |
| P0300, P0301, P0302, P0303, P0304, P0305 OR P0306 | MISFIRE DETECTION MONITOR |
| P0325 | KNOCK SENSOR (KS) CIRCUIT MALFUNCTION |
| P0335 | CRANKSHAFT POSITION SENSOR (CKP) SENSOR CIRCUIT MALFUNCTION |
| P0400 | EGR SYSTEM MALFUNCTION |
| P0404 | EGR CIRCUIT, RANGE/PERFORMANCE PROBLEM |
| P0421 & P0431 | CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD |
| P0442 | EVAP CONTROL SYSTEM, SMALL LEAK DETECTED |
| P0443 | EVAP CONTROL SYSTEM PURGE CONTROL VALVE CIRCUIT MALFUNCTION |
| P0450 | FUEL TANK PRESSURE SENSOR CIRCUIT MALFUNCTION |
| P0451 | FUEL TANK PRESSURE SENSOR, PERFORMANCE PROBLEM |
| P0455 | EVAP CONTROL SYSTEM, EXCESSIVE LEAK OR BLOCKAGE DETECTED |
| P0464 | FUEL GAUGE SENDING UNIT CIRCUIT, SLOSH CHECK |
| P0480 | CONDENSER FAN RELAY NO. 1 CIRCUIT MALFUNCTION |
| P0481 | COOLING FAN RELAY NO. 1 & CONDENSER FAN RELAY NO. 2 CIRCUIT MALFUNCTION |
| P0482 | COOLING FAN RELAY NO. 2 & NO. 3 CIRCUIT MALFUNCTION |
| P0500 | VEHICLE SPEED SENSOR (VSS) CIRCUIT MALFUNCTION |
| P0505 | IDLE AIR CONTROL SYSTEM MALFUNCTION |
| P0510 | CLOSED THROTTLE POSITION (CTP) SWITCH CIRCUIT MALFUNCTION |
| P0550 | POWER STEERING PRESSURE SWITCH CIRCUIT MALFUNCTION |
| P0703 | BRAKE SWITCH INPUT MALFUNCTION |
| P1110 | AIR INTAKE RESONATOR INTAKE AIR TEMPERATURE (IAT) CIRCUIT MALFUNCTION |
| P1113 | LYSHOLM COMPRESSOR IAT CIRCUIT MALFUNCTION |
| P1170 | RIGHT FRONT HO2S, NO INVERSION |
| P1173 | LEFT FRONT HO2S, NO INVERSION |
| P1196 | STARTER SIGNAL CIRCUIT MALFUNCTION |
| P1250 | PRESSURE REGULATOR CONTROL (PRC) SOLENOID VALVE CIRCUIT MALFUNCTION |
| P1345 | CAMSHAFT POSITION (CMP) SENSOR CIRCUIT MALFUNCTION |
| P1402 | EGR VALVE POSITION SENSOR CIRCUIT MALFUNCTION |
| P1449 | CANISTER DRAIN CUT VALVE (CDCV) CIRCUIT MALFUNCTION |
| P1450 | EVAP CONTROL SYSTEM MALFUNCTION, EXCESSIVE VACUUM |
| P1455 | FUEL GAUGE SENDER UNIT CIRCUIT MALFUNCTION |
| P1487 | MAP SENSOR SOLENOID VALVE CIRCUIT MALFUNCTION |
| P1508 | BY-PASS SOLENOID VALVE CIRCUIT MALFUNCTION |
| P1524 | CHARGE AIR COOLER BY-PASS SOLENOID VALVE CIRCUIT MALFUNCTION |
| P1525 | AIR BY-PASS VALVE (ABV) SOLENOID VALVE (VACUUM) CIRCUIT MALFUNCTION |
| P1526 | AIR BY-PASS VALVE (ABV) SOLENOID VALVE (VENT) CIRCUIT MALFUNCTION |
| P1540 | AIR BY-PASS VALVE (ABV) CONTROL SYSTEM MALFUNCTION |
| P1601 | COMMUNICATION LINE ERROR (PCM-TCM) |
| P1608 | PCM CIRCUIT MALFUNCTION |
| P1609 | PCM INTERNAL MALFUNCTION |
| P1627 | PCM - ANTI-LOCK BRAKE SYSTEM (ABS)/TRACTION CONTROL SYSTEM (TCS) ABS HYDRAULIC UNIT (HU)/CONTROL MODULE (CM) LINE COMMUNICATION ERROR |
| P1628 | PCM - ANTI-LOCK BRAKE SYSTEM (ABS)/TRACTION CONTROL SYSTEM (TCS) LINE COMMUNICATION ERROR |
| P1794 | PCM +BB VOLTAGE LOW |
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.