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.
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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1 (ENGINE CONTROLS - SELF-DIAGNOSTICS - INTRODUCTION)SELF-DIAGNOSTIC SYSTEMDIAGNOSTIC TROUBLE CODE IDENTIFICATION
1999 Mazda 626 ES, 2.5 D, Standard
Diagnostic Trouble Code Identification
1999 Mazda 626 ES, 2.5 D, StandardSECTION Diagnostic Trouble Code Identification
WARNING: This page is about a different car, the 2000 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION - 626
| DTC | DIAGNOSTIC/System Affected |
|---|---|
| P0102 | MASS AIRFLOW (MAF) SENSOR |
| P0103 | MASS AIRFLOW (MAF) SENSOR |
| P0106 | EGR BOOST SENSOR |
| P0107 | EGR BOOST SENSOR |
| P0108 | EGR BOOST SENSOR |
| P0112 | TEMPERATURE SENSOR INPUT LOW (IAT) |
| P0113 | EMPERATURE SENSOR (IAT OR ECT) |
| P0117 | TEMPERATURE SENSOR INPUT LOW (ECT) |
| P0118 | TEMPERATURE SENSOR (IAT OR ECT) |
| P0122 | THROTTLE POSITION (TP) SENSOR LOW INPUT |
| P0123 | THROTTLE POSITION (TP) SENSOR HIGH INPUT |
| P0125 | EXCESSIVE TIME TO ENTER CLOSED LOOP |
| P0133 | HEATED OXYGEN SENSOR (LOW RESPONSE) |
| P0135 | HEATED OXYGEN SENSOR HEATER |
| P0136 | FUEL CONTROL |
| P1137 | FUEL CONTROL |
| P1138 | FUEL CONTROL |
| P0141 | HEATED OXYGEN SENSOR HEATER |
| P0147 | HEATED OXYGEN SENSOR HEATER |
| P0153 | HEATED OXYGEN SENSOR (LOW RESPONSE) |
| P0155 | HEATED OXYGEN SENSOR HEATER |
| P0142 | FUEL CONTROL |
| P0171 | FUEL CONTROL - HO2S NOT SWITCHING |
| P0172 | FUEL CONTROL - HO2S NOT SWITCHING |
| P0174 | FUEL CONTROL - HO2S NOT SWITCHING |
| P0175 | FUEL CONTROL - HO2S NOT SWITCHING |
| P0230 | FUEL PUMP RELAY |
| P0300 | MISFIRE DETECTION MONITOR (RANDOM) |
| P0301 | MISFIRE DETECTION MONITOR (CYL. NO. 1) |
| P0302 | MISFIRE DETECTION MONITOR (CYL. NO. 2) |
| P0303 | MISFIRE DETECTION MONITOR (CYL. NO. 3) |
| P0304 | MISFIRE DETECTION MONITOR (CYL. NO. 4) |
| P0305 | MISFIRE DETECTION MONITOR (CYL. NO. 5) |
| P0306 | MISFIRE DETECTION MONITOR (CYL. NO. 6) |
| P0320 | DISTRIBUTOR IGNITION |
| P0325 | KNOCK SENSOR (KS) CIRCUIT |
| P0340 | CAMSHAFT POSITION (CMP) SENSOR CIRCUIT |
| P0400 | EGR FLOW MALFUNCTION |
| P0420 | CATALYST EFFICIENCY MONITOR & EXHAUST SYSTEMS |
| P0421 | CATALYST EFFICIENCY MONITOR & EXHAUST SYSTEMS |
| P0442 | EVAPORATIVE EMISSION SYSTEM (SMALL LEAK) |
| P0443 | EVAPORATIVE EMISSION SYSTEM |
| P0446 | EVAPORATIVE EMISSION SYSTEM |
| P0452 | EVAPORATIVE EMISSION SYSTEM |
| P0453 | EVAPORATIVE EMISSION SYSTEM |
| P0455 | EVAPORATIVE EMISSION SYSTEM (LARGE LEAK) |
| P0460 | FUEL GAUGE SENDER UNIT |
| P0500 | VEHICLE SPEED SENSOR (VSS) |
| P0505 | IDLE AIR CONTROL (IAC) VALVE |
| P0603 | POWERTRAIN CONTROL MODULE MALFUNCTION |
| P0605 | POWERTRAIN CONTROL MODULE MALFUNCTION |
| P0703 | BRAKE SWITCH MALFUNCTION |
| P0704 | CLUTCH SWITCH INPUT CIRCUIT |
| P1001 | UNABLE TO ACTIVATE SELF-TEST/SCP COMMUNICATION ERROR CODE NOT LISTED |
| P1100 | MASS AIRFLOW (MAF) SENSOR INTERMITTENT |
| P1101 | MASS AIRFLOW (MAF) SENSOR OUT OF RANGE |
| P1112 | TEMPERATURE SENSOR (IAT OR ECT) |
| P1116 | ECT SENSOR |
| P1117 | TEMPERATURE SENSOR (IAT OR ECT) |
| P1120 | THROTTLE POSITION (TP) SENSOR OUT OF RANGE (LOW) |
| P1121 | THROTTLE POSITION (TP) SENSOR |
| P1124 | THROTTLE POSITION (TP) SENSOR OUT OF RANGE |
| P1125 | THROTTLE POSITION (TP) SENSOR |
| P1127 | FUEL CONTROL |
| P1130 | FUEL CONTROL - HO2S NOT SWITCHING |
| P1131 | FUEL CONTROL - HO2S NOT SWITCHING |
| P1143 | FUEL CONTROL |
| P1144 | FUEL CONTROL |
| P1150 | FUEL CONTROL - HO2S NOT SWITCHING |
| P1151 | FUEL CONTROL - HO2S NOT SWITCHING |
| P1152 | FUEL CONTROL - HO2S NOT SWITCHING |
| P1250 | FUEL PRESSURE REGULATOR CONTROL (FPRC) SOLENOID |
| P1409 | EGR VALVE MALFUNCTION |
| P1410 | EGR BOOST SOLENOID VALVE STUCK |
| P1450 | EVAP CONTROL SYSTEM |
| P1451 | CANISTER DRAIN CUT VALVE (CDCV) MALFUNCTION |
| P1460 | WOT A/C CUT-OFF (WAC) |
| P1460 | WOT A/C CUT-OFF (CONTINUOUS MEMORY) |
| P1464 | A/C DEMAND OUT OF RANGE |
| P1474 | FAN CONTROL (FC) RELAY |
| P1474 | FAN CONTROL (FC) RELAY (CONTINUOUS MEMORY) |
| P1479 | FAN CONTROL (FC) RELAY |
| P1479 | FAN CONTROL (FC) RELAY (CONTINUOUS MEMORY) |
| P1487 | EGR BOOST SOLENOID VALVE CIRCUIT |
| P1501 | VEHICLE SPEED SENSOR (VSS) |
| P1504 | IDLE AIR CONTROL (IAC) VALVE |
| P1506 | IDLE AIR CONTROL (IAC) VALVE |
| P1507 | IDLE AIR CONTROL (IAC) VALVE |
| P1602 | IMMOBILIZER UNIT TO PCM COMMUNICATION |
| P1603 | CODE WORD OR KEY ID NUMBER NOT REGISTERED IN PCM |
| P1604 | CODE WORD OR KEY ID NUMBER NOT REGISTERED IN PCM |
| P1621 | CODE WORD OR KEY ID NUMBER NOT REGISTERED IN PCM |
| P1622 | KEY ID NUMBER DOES NOT MATCH |
| P1623 | CODE WORD OR KEY ID NUMBER READ/WRITE ERROR IN PCM |
| P1624 | IMMOBILIZER COMMUNICATION COUNTER = 0 |
| P1650 | POWER STEERING PRESSURE (PSP) SWITCH |
| P1652 | POWER STEERING PRESSURE (PSP) SWITCH |
| P1703 | BRAKE SWITCH OUT OF RANGE |
| P1703 | BRAKE SWITCH MALFUNCTION |
RENDER: 1.0x
NO RELATED
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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.