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 6 s, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Performance (2.3L) DTCS
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| DTC | Description |
|---|---|
| P0011 | CMP Timing - Over Advanced |
| P0012 | CMP Timing - Over Retarded |
| P0031 | Front HO2S Heater Circuit - Low Input |
| P0032 | Front HO2S Heater Circuit - High Input |
| P0037 | Rear HO2S Heater Circuit - Low Input |
| P0038 | Rear HO2S Heater Circuit - High Input |
| P0101 | Mass Airflow/Intake Air Temperature Sensor Inconsistent With Throttle Position Sensor Or engine Speed |
| P0102 | Mass Airflow/Intake Air Temperature Sensor Circuit - Low Input |
| P0103 | Mass Airflow/Intake Air Temperature Sensor Circuit - High Input |
| P0106 | Manifold Absolute Pressure Sensor - Performance Problem |
| P0107 | Manifold Absolute Pressure Sensor Circuit - Low Input |
| P0108 | Manifold Absolute Pressure Sensor Circuit - High Input |
| P0111 | Mass Airflow/Intake Air Temperature Sensor Circuit - Performance Problem |
| P0112 | Mass Airflow/Intake Air Temperature Sensor Circuit - Low Input |
| P0113 | Mass Airflow/Intake Air Temperature Sensor Circuit - High Input |
| P0117 | Engine Coolant Temperature Sensor Circuit - Low Input |
| P0118 | Engine Coolant Temperature Sensor Circuit - High Input |
| P0122 | Throttle Position Sensor - Low Input |
| P0123 | Throttle Position Sensor - High Input |
| P0125 | Excessive Time To Enter Close Loop |
| P0126 | Coolant Thermostat - Stuck Open |
| P0128 | Coolant Thermostat - Stuck Open |
| P0131 | Front HO2S - Stuck Low |
| P0132 | Front HO2S - Stuck High |
| P0133 | Front HO2S Circuit - Malfunction |
| P0134 | Front HO2S Circuit - No Activity Detected |
| P0137 | Rear HO2S Circuit - Low Input |
| P0138 | Rear HO2S Circuit - High Input |
| P0140 | Rear HO2S Circuit - No Activity Detected |
| P0171 | Fuel Trim System - Too Lean |
| P0172 | Fuel Trim System - Too Rich |
| P0222 | Throttle Position Sensor No. 2 Circuit - Low Input |
| P0223 | Throttle Position Sensor No. 2 Circuit - High Input |
| P0300 | Random Misfire Detection |
| P0301 | Cylinder No. 1 Misfire Detection |
| P0302 | Cylinder No. 2 Misfire Detection |
| P0303 | Cylinder No. 3 Misfire Detection |
| P0304 | Cylinder No. 4 Misfire Detection |
| P0327 | Knock Sensor Circuit - Low Input |
| P0328 | Knock Sensor Circuit - High Input |
| P0335 | Crankshaft Position Sensor Circuit - Malfunction |
| P0340 | Camshaft Position Sensor Circuit - Malfunction |
| P0401 | EGR Flow Insufficient Detected |
| P0402 | EGR Flow Excessive Detected |
| P0403 | EGR Valve (Stepper Motor) Circuit - Malfunction |
| P0420 | Catalyst System Efficiency - Below Threshold |
| P0441 | Evaporative Emission Control System - Incorrect Purge Flow |
| P0442 | Evaporative Emission Control System - Small Leak |
| P0443 | Evaporative Emission Control System Purge Solenoid Valve Circuit - Malfunction |
| P0446 | Evaporative Emission System Vent Control - Malfunction |
| P0455 | Evaporative Emission Control System Leak Detected - Gross Leak |
| P0456 | Evaporative Emission Control System Leak Detected - Very Small |
| P0461 | Fuel Gauge Sender Unit Circuit Range/Performance |
| P0462 | Fuel Gauge Sender Unit Circuit - Low Input |
| P0463 | Fuel Gauge Sender Unit Circuit - High Input |
| P0480 | Fan Relay No. 1 Control Circuit - Malfunction |
| P0481 | Fan Relay No. 2 & No. 3 Control Circuit - Malfunction |
| P0482 | Fan Relay No. 4 Control Circuit - Malfunction |
| P0500 | Vehicle Speed Sensor Circuit - Malfunction |
| P0505 | Idle Control System - Malfunction |
| P0506 | Idle Control System - RPM Lower Than Expected |
| P0507 | Idle Control System - RPM Greater Than Expected |
| P0550 | Power Steering Pressure Switch Circuit - Malfunction |
| P0564 | Cruise Control Switch - Malfunction |
| P0571 | Brake Switch Circuit - Malfunction |
| P0601 | Internal Control Module Memory Check Sum Error |
| P0602 | PCM Programming Error |
| P0604 | PCM RAM Error |
| P0606 | ECM/PCM Processor |
| P0607 | Control Module Performance |
| P0610 | Control Module Vehicle Options Error |
| P0638 | Throttle Actuator Control Range/Performance |
| P0661 | Variable Intake-Air System Control Solenoid Valve Circuit - Low Input |
| P0662 | Variable Intake-Air System Control Solenoid Valve Circuit - High Input |
| P0703 | Brake Switch No. 1 Circuit - Malfunction |
| P0704 | Clutch Switch Circuit - Malfunction |
| P0850 | Neutral Switch Circuit - Malfunction |
| P1410 | Variable Air Duct Control System Circuit - Malfunction |
| P1562 | TCM +BB Voltage - Low |
| P2004 | Variable Tumble Control System Shutter Valve - Stuck Open |
| P2006 | Variable Tumble Control System Shutter Valve - Stuck Closed |
| P2009 | Variable Tumble Control System Solenoid Valve Circuit - Low Input |
| P2010 | Variable Tumble Control System Solenoid Valve Circuit - High Input |
| P2088 | Oil Control Valve Actuator Circuit - Low Input |
| P2089 | Oil Control Valve Actuator Circuit - High Input |
| P2100 | Throttle Actuator Circuit - Open |
| P2101 | Throttle Actuator Circuit - Range/Performance |
| P2102 | Throttle Actuator Circuit - Low Input |
| P2103 | Throttle Actuator Circuit - High Input |
| P2107 | Throttle Actuator Control Module Processor |
| P2108 | Throttle Actuator Control Module - Performance |
| P2119 | Throttle Actuator Control Throttle Body - Range/Performance |
| P2122 | Accelerator Pedal Position Sensor No. 1 Circuit - Low Input |
| P2123 | Accelerator Pedal Position Sensor No. 1 Circuit - High Input |
| P2127 | Accelerator Pedal Position Sensor No. 2 Circuit - Low Input |
| P2128 | Accelerator Pedal Position Sensor No. 2 Circuit - High Input |
| P2135 | Throttle Position Sensor No. 1/No. 2 - Voltage Correlation |
| P2138 | Accelerator Pedal Position Sensor No. 1/No. 2 - Voltage Correlation |
| P2228 | BARO Sensor Circuit - Low Input |
| P2229 | BARO Sensor Circuit - High Input |
| P2401 | Evaporative Emission System Leak Detection Pump Control Circuit - Low Input |
| P2402 | Evaporative Emission System Leak Detection Pump Control Circuit - High Input |
| P2404 | Evaporative Emission System Leak Detection Pump Sense Circuit - Malfunction |
| P2405 | Evaporative Emission System Leak Detection Pump Sense Circuit - Low Input |
| P2406 | Evaporative Emission System Leak Detection Pump Sense Circuit - High Input |
| P2407 | Evaporative Emission System Leak Detection Pump Sense Circuit - Intermittent |
| P2502 | Generator Terminal B Circuit - Open |
| P2503 | Generator Output Voltage Signal - No Electricity |
| P2504 | Battery - Overcharge |
| U0073 | CAN System Communication Error |
| U0100 | Communication Error To PCM |
| U0121 | Communication Error To ABS/TCS HU/CM |
| U0155 | Communication Error To Instrument Cluster |
| U1900 | CAN System Communication Error |
| U2516 | CAN System Wiring Harness Open Or Short |
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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