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.
1996 Mazda Millenia BaseFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes - 2.5L
- Introduction
- Self-Diagnostic System
- Summary
- Diagnostic Trouble Code Charts
- Notes
- DTC P0100: Mass Air Flow/Volume Air Flow CKT Malfunction
- DTC P0105: Map/Barometric Pressure CKT Malfunction
- DTC P0110: Intake Air Temperature CKT Malfunction
- DTC P0115: Engine Coolant Temperature CKT Malfunction
- DTC P0120: Throttle Position CKT Malfunction
- DTC P0125: Excessive Time To Enter Closed Loop Fuel Control
- DTC P0130: Oxygen Sensor CKT Malfunction
- DTC P0134: Oxygen Sensor CKT No Activity Detected
- DTC P0135: Oxygen Sensor Heater CKT Malfunction
- DTC P0140: Oxygen Sensor CKT No Activity Detected
- DTC P0150: Oxygen Sensor CKT Malfunction
- DTC P0154: Oxygen Sensor CKT No Activity Detected
- DTC P0155: Oxygen Sensor Heater CKT Malfunction
- DTC P0160: Oxygen Sensor CKT No Activity Detected
- DTC P0170: Fuel Trim Malfunction
- DTC P0173: Fuel Trim Malfunction
- DTC P0300: Random Misfire Detected
- DTC P0301: Cylinder No. 1 Misfire Detected
- DTC P0302: Cylinder No. 2 Misfire Detected
- DTC P0303: Cylinder No. 3 Misfire Detected
- DTC P0304: Cylinder No. 4 Misfire Detected
- DTC P0305: Cylinder No. 5 Misfire Detected
- DTC P0306: Cylinder No. 6 Misfire Detected
- DTC P0325: Knock Sensor No. 1 CKT Malfunction
- DTC P0335: Crankshaft Position Sensor CKT Malfunction
- DTC P0400: Exhaust Gas RECIRCULATION Flow Malfunction
- DTC P0420: Catalyst System Efficiency Below Threshold
- DTC P0430: Catalyst System Efficiency Below Threshold
- DTC P0440: Evaporative Emission Control System Malfunction
- DTC P0443: EVAP System Purge Control Valve CKT Malfunction
- DTC P0505: Idle Control System Malfunction
- DTC P0510: Closed Throttle Position Switch Malfunction
- DTC P0703: Brake Switch Input Malfunction
- DTC P1000: Readiness Function Code
- DTC P1170: Front Right Heated Oxygen Sensor - Inversion
- DTC P1173: Front Left Heated Oxygen Sensor - Inversion
- DTC P1195: EGR Boost Sensor
- DTC P1196: Ignition Switch - Starter
- DTC P1345: No SGC Signal
- DTC P1402: EGR Valve Position Sensor
- DTC P1521: VRIS Solenoid Valve No. 1
- DTC P1522: VRIS Solenoid Valve No. 2
- DTC P1609: PCM'S Knock Control Integrated CKT Is Damaged
- DTC P1627: Pcm-Abs/TCS Control Unit Line Comm. Error
- DTC P1720: Speedometer Sensor
- DTC P1794: Battery
- DTC P1797: No P Or N Range Or Neutral/Clutch Switch Signal
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.