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.
1995 Mazda Millenia BaseFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes - 2.5L
- Introduction
- Self-Diagnostic System
- Trouble Code Charts
- Notes
- Code P0100: Mass Air Flow Circuit Malfunction
- Code P0110: Intake Air Temperature Circuit Malfunction
- Code P0115: Engine Coolant Temperature Circuit Malfunction
- Code P0120: Throttle Position Circuit Malfunction
- Code P0125: Excessive Time To Enter Closed Loop Fuel Control
- Code P0130: Oxygen Sensor Circuit Malfunction
- Code P0134: Oxygen Sensor Circuit No Activity Detected
- Code P0135: Oxygen Sensor Heater Circuit Malfunction
- Code P0140: Oxygen Sensor Circuit Malfunction
- Code P0150: Oxygen Sensor Circuit No Activity Detected
- Code P0154: Oxygen Sensor Circuit No Activity Detected
- Code P0155: Oxygen Sensor Heater Circuit Malfunction
- Code P0160: Oxygen Sensor Circuit No Activity Detected
- Code P0170: Fuel Trim Malfunction
- Code P0173: Fuel Trim Malfunction
- Code P0300: Random Misfire Detected
- Code P0301: Cylinder No. 1 Misfire Detected
- Code P0302: Cylinder No. 2 Misfire Detected
- Code P0303: Cylinder No. 3 Misfire Detected
- Code P0304: Cylinder No. 4 Misfire Detected
- Code P0305: Cylinder No. 5 Misfire Detected
- Code P0306: Cylinder No. 6 Misfire Detected
- Code P0325: Knock Sensor No. 1 Circuit Malfunction
- Code P0335: Crankshaft Position Sensor Circuit Malfunction
- Code P0400: Exhaust Gas RECIRCULATION Flow Malfunction
- Code P0420: Catalyst System Efficiency Below Threshold
- Code P0430: Catalyst System Efficiency Below Threshold
- Code P0440: Evaporative Emission Control System Malfunction
- Code P0443: Evaporative Emission Control System Purge Control Valve Circuit Malfunction
- Code P0500: Vehicle Speed Sensor Malfunction
- Code P0505: Idle Control System Malfunction
- Code P0510: Closed Throttle Position Switch Malfunction
- Code P0703: Brake Switch Input Malfunction
- Code P1000: Readiness Function Code
- Code P1170: Front Right Heated Oxygen Sensor - Inversion
- Code P1173: Front Left Heated Oxygen Sensor - Inversion
- Code P1195: Barometric Absolute Pressure Sensor
- Code P1196: Starter
- Code P1250: PRC Solenoid Valve
- Code P1345: SGC Signal
- Code P1402: EGR Valve Position Sensor
- Code P1485: EGR Vacuum Solenoid Valve
- Code P1486: EGR Vent Solenoid Valve
- Code P1487: EGR Boost Sensor Solenoid Valve
- Code P1521: VRIS Solenoid Valve No. 1
- Code P1522: VRIS Solenoid Valve No. 2
- Code P1601: Communication Line - ECM-TCM
- Code P1608: ECM
- Code P1794: Battery
- Code P1797: P Or N Position Signal
- Summary
Factory Service Tools
Use the Manual With the Right Hardware
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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.