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 Mazda Protege5 AutomaticFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Definitions
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| DTC | System Affected | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| P0031 | Front HO2S Heater Circuit - Low | ||||||||||
| P0032 | Front HO2S Heater Circuit - High | ||||||||||
| P0037 | Rear HO2S Heater Circuit - Low | ||||||||||
| P0038 | Rear HO2S Heater Circuit - High | ||||||||||
| P0090 | Pressure Regulator Control Solenoid Valve Circuit Malfunction | ||||||||||
| P0101 | Mass Airflow Circuit Range/Performance Problem | ||||||||||
| P0102 | Mass Airflow Sensor Circuit - Low Input | ||||||||||
| P0103 | Mass Airflow Sensor Circuit - High Input | ||||||||||
| P0106 | BARO Circuit - Performance Problem | ||||||||||
| P0107 | BARO Circuit - Low Input | ||||||||||
| P0108 | BARO Circuit - High Input | ||||||||||
| P0111 | Intake Air Temperature Sensor Circuit - Performance Problem | ||||||||||
| P0112 | Intake Air Temperature Sensor Circuit - Low Input | ||||||||||
| P0113 | Intake Air Temperature Sensor Circuit - High Input | ||||||||||
| P0117 | Engine Coolant Temperature Sensor Circuit - Low Input | ||||||||||
| P0118 | Engine Coolant Temperature Sensor Circuit - High Input | ||||||||||
| P0121 | Throttle Position Sensor Circuit - Range/Performance Problem | ||||||||||
| P0122 (3) | Throttle Position Sensor Circuit - Low Input | ||||||||||
| P0123 (3) | Throttle Position Sensor Circuit - High Input | ||||||||||
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control | ||||||||||
| P0126 | Coolant Thermostat Stuck Open | ||||||||||
| P0128 | Coolant Thermostat Stuck Open | ||||||||||
| P0131 | HO2S (Front) No Inversion - Low Voltage Stuck | ||||||||||
| P0132 | HO2S (Front) No Inversion - High Voltage Stuck | ||||||||||
| P0133 | HO2S (Front) Circuit - Slow Response | ||||||||||
| P0134 | HO2S (Front) Circuit - No Activity Detected | ||||||||||
| P0138 | HO2S (Rear) Circuit - High Input | ||||||||||
| P0140 | HO2S (Rear) Circuit - No Activity Detected | ||||||||||
| P0171 | Fuel Trim - Too Lean | ||||||||||
| P0172 | Fuel Trim - Too Rich | ||||||||||
| P0300 (2) | Random Misfire Detected | ||||||||||
| P0301 (2) | Cylinder No. 1 Misfire Detected | ||||||||||
| P0302 (2) | Cylinder No. 2 Misfire Detected | ||||||||||
| P0303 (2) | Cylinder No. 3 Misfire Detected | ||||||||||
| P0304 (2) | Cylinder No. 4 Misfire Detected | ||||||||||
| P0325 | Knock Sensor Circuit Malfunction | ||||||||||
| P0335 | Crankshaft Position Sensor Circuit Malfunction | ||||||||||
| P0340 | Camshaft Position (CMP) Sensor Circuit Malfunction | ||||||||||
| P0401 | EGR System - Insufficient Flow | ||||||||||
| P0402 | EGR System - Excessive Flow | ||||||||||
| P0421 | Catalyst System Efficiency Below Threshold | ||||||||||
| P0442 | EVAP Control System, Small Leak Detected | ||||||||||
| P0443 (1) | EVAP Control System Purge Control Valve - Circuit Malfunction | ||||||||||
| P0451 | Fuel Tank Pressure Sensor - Performance Problem | ||||||||||
| P0452 | EVAP Control System Pressure Sensor - Low Input | ||||||||||
| P0453 | EVAP Control System Pressure Sensor - High Input | ||||||||||
| P0455 | EVAP Control System Leak Detected - Blockage Or Large Leak | ||||||||||
| P0456 | EVAP Control System Leak Detected - Very Small Leak | ||||||||||
| P0461 | Fuel Gauge Sender Unit Circuit - Range/Performance Problem | ||||||||||
| P0462 | Fuel Gauge Sender Unit Circuit - Low Input | ||||||||||
| P0463 | Fuel Gauge Sending Unit Circuit - High Input | ||||||||||
| P0464 | Fuel Gauge Sending Unit Circuit - Slosh Check | ||||||||||
| P0480 (1) | Cooling Fan Relay Circuit | ||||||||||
| P0500 (4) | Vehicle Speed Sensor Malfunction | ||||||||||
| P0505 | Idle Air Control Valve Circuit Malfunction | ||||||||||
| P0506 | Idle Control System - RPM Less Than Expected | ||||||||||
| P0507 | Idle Control System - RPM Greater Than Expected | ||||||||||
| P0550 | Power Steering Pressure Switch Circuit Malfunction | ||||||||||
| P0660 (1) | Variable Inertia Charging System Solenoid Valve Circuit Malfunction | ||||||||||
| P0703 | Brake Switch Input Circuit Malfunction | ||||||||||
| P0704 | Clutch Switch Input Circuit Malfunction (MTX) | ||||||||||
| P0705 (5) | Automatic Transaxle | ||||||||||
| P0706 (5) | Automatic Transaxle | ||||||||||
| P0710 (5) | Automatic Transaxle | ||||||||||
| P0711 (5) | Automatic Transaxle | ||||||||||
| P0715 (5) | Automatic Transaxle | ||||||||||
| P0731 (5) | Automatic Transaxle | ||||||||||
| P0732 (5) | Automatic Transaxle | ||||||||||
| P0733 (5) | Automatic Transaxle | ||||||||||
| P0734 (5) | Automatic Transaxle | ||||||||||
| P0741 (5) | Automatic Transaxle | ||||||||||
| P0742 (5) | Automatic Transaxle | ||||||||||
| P0745 (5) | Automatic Transaxle | ||||||||||
| P0751 (5) | Automatic Transaxle | ||||||||||
| P0752 (5) | Automatic Transaxle | ||||||||||
| P0753 (5) | Automatic Transaxle | ||||||||||
| P0756 (5) | Automatic Transaxle | ||||||||||
| P0757 (5) | Automatic Transaxle | ||||||||||
| P0758 (5) | Automatic Transaxle | ||||||||||
| P0761 (5) | Automatic Transaxle | ||||||||||
| P0762 (5) | Automatic Transaxle | ||||||||||
| P0763 (5) | Automatic Transaxle | ||||||||||
| P0766 (5) | Automatic Transaxle | ||||||||||
| P0767 (5) | Automatic Transaxle | ||||||||||
| P0768 (5) | Automatic Transaxle | ||||||||||
| P0771 (5) | Automatic Transaxle | ||||||||||
| P0772 (5) | Automatic Transaxle | ||||||||||
| P0773 (5) | Automatic Transaxle | ||||||||||
| P0850 | Neutral Switch Input Circuit Malfunction | ||||||||||
| P1449 (1) | Canister Drain Cut Valve - Open Or Short | ||||||||||
| P1450 | EVAP Control System Malfunction - Excessive Vacuum | ||||||||||
| P1487 (1) | EGR Boost Sensor Solenoid Valve Circuit Malfunction | ||||||||||
| P1496 (1) | EGR Valve Solenoid Coil No. 1 - Open Or Short | ||||||||||
| P1497 (1) | EGR Valve Solenoid Coil No. 2 - Open Or Short | ||||||||||
| P1498 (1) | EGR Valve Solenoid Coil No. 3 - Open Or Short | ||||||||||
| P1499 (1) | EGR Valve Solenoid Coil No. 4 - Open Or Short | ||||||||||
| P1562 | PCM +BB Voltage Low | ||||||||||
| P1631 (1) | Generator Output Voltage Signal - No Electricity | ||||||||||
| P1632 (1) | Battery Voltage Circuit Malfunction | ||||||||||
| P1633 (1) | Battery Overcharge | ||||||||||
| P1634 (1) | Generator Terminal "B" Circuit Open | ||||||||||
| P2006 | Variable Tumble Control System - Stuck Closed | ||||||||||
| P2009 | Variable Tumble Control System Solenoid Valve Circuit - Low Input | ||||||||||
| P2010 | Variable Tumble Control System Solenoid Valve Circuit - High Input | ||||||||||
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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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