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.
2002 Mazda 626 ES, AutomaticFACTORY OEM SERVICE PROCEDURE
Engine Performance (2.0L) DTCS
ENGINE PERFORMANCE (2.0L) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| P0068 | THROTTLE POSITION (TP) SENSOR INCONSISTENT WITH MASS AIRFLOW (MAF) SENSOR |
| P0102 | MASS AIRFLOW (MAF) SENSOR CIRCUIT, LOW INPUT |
| P0103 | MASS AIRFLOW (MAF) SENSOR CIRCUIT, HIGH INPUT |
| P0106 | BARO SENSOR CIRCUIT, PERFORMANCE PROBLEM |
| P0107 | BARO SENSOR CIRCUIT, LOW INPUT |
| P0108 | BARO SENSOR CIRCUIT, HIGH INPUT |
| P0112 | INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT, LOW INPUT |
| P0113 | INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT, HIGH INPUT |
| P0116 | ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT, PERFORMANCE PROBLEM |
| P0117 | ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT, LOW INPUT |
| P0118 | ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT, HIGH INPUT |
| P0122 | THROTTLE POSITION (TP) SENSOR, LOW INPUT |
| P0123 | THROTTLE POSITION (TP) SENSOR, HIGH INPUT |
| P0125 | EXCESSIVE TIME TO ENTER CLOSED LOOP |
| P0126 | COOLANT THERMOSTAT STUCK OPEN |
| P0128 | COOLANT THERMOSTAT STUCK OPEN |
| P0133 | FRONT HEATED OXYGEN SENSOR CIRCUIT, SLOW RESPONSE |
| P0135 | FRONT HEATED OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION |
| P0136 | REAR HEATED OXYGEN SENSOR CIRCUIT MALFUNCTION |
| P1137 | REAR HEATED OXYGEN SENSOR NOT SWITCHING (SENSOR INDICATES LEAN) |
| P1138 | REAR HEATED OXYGEN SENSOR NOT SWITCHING (SENSOR INDICATES RICH) |
| P0141 | REAR HEATED OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION |
| P0171 | FUEL TRIM SYSTEM, TOO LEAN |
| P0172 | FUEL TRIM SYSTEM, TOO RICH |
| P1130 | FRONT HEATED OXYGEN SENSOR NOT SWITCHING (ADAPTED FUEL LIMIT) |
| P1131 | FRONT HEATED OXYGEN SENSOR NOT SWITCHING (SENSOR INDICATES LEAN) |
| P1132 | FRONT HEATED OXYGEN SENSOR NOT SWITCHING (SENSOR INDICATES RICH) |
| P0230 | FUEL PUMP PRIMARY CIRCUIT MALFUNCTION |
| P0300 | MISFIRE DETECTION MONITOR (RANDOM) |
| P0301 | CYLINDER NO. 1 MISFIRE DETECTED |
| P0302 | CYLINDER NO. 2 MISFIRE DETECTED |
| P0303 | CYLINDER NO. 3 MISFIRE DETECTED |
| P0304 | CYLINDER NO. 4 MISFIRE DETECTED |
| P0316 | MISFIRE DURING FIRST 1000 REVS AFTER START-UP |
| P0320 | CRANKSHAFT POSITION (CKP) SENSOR CIRCUIT MALFUNCTION |
| P0325 | KNOCK SENSOR (KS) CIRCUIT MALFUNCTION |
| P0340 | CAMSHAFT POSITION (CMP) SENSOR CIRCUIT MALFUNCTION |
| P0400 | EGR FLOW MALFUNCTION |
| P0403 | EGR VALVE CONTROL CIRCUIT MALFUNCTION |
| P0421 | CATALYST WARM-UP EFFICIENCY, LOW |
| P0442 | EVAPORATIVE EMISSION SYSTEM, SMALL LEAK |
| P0443 | EVAPORATIVE EMISSION SYSTEM PURGE CONTROL VALVE CIRCUIT MALFUNCTION |
| P0446 | EVAPORATIVE EMISSION SYSTEM VENT CONTROL MALFUNCTION |
| P0452 | EVAPORATIVE EMISSION SYSTEM FUEL TANK PRESSURE SENSOR, LOW INPUT |
| P0453 | EVAPORATIVE EMISSION SYSTEM FUEL TANK PRESSURE SENSOR, HIGH INPUT |
| P0455 | EVAPORATIVE EMISSION SYSTEM, LARGE LEAK |
| P0460 | FUEL GAUGE SENDER UNIT CIRCUIT MALFUNCTION |
| P0461 | FUEL GAUGE SENDER UNIT CIRCUIT PERFORMANCE PROBLEM |
| P0480 | COOLING FAN CONTROL CIRCUIT MALFUNCTION |
| P0481 | CONDENSER FAN CONTROL CIRCUIT MALFUNCTION |
| P0500 | VEHICLE SPEED SENSOR (VSS) CIRCUIT MALFUNCTION |
| P0503 | VEHICLE SPEED SENSOR (VSS), ERRATIC MALFUNCTION |
| P1501 | VEHICLE SPEED SENSOR (VSS), OUT OF RANGE |
| P0505 | IDLE AIR CONTROL (IAC) VALVE, SYSTEM MALFUNCTION |
| P0506 | IDLE CONTROL SYSTEM, RPM LESS THAN EXPECTED |
| P0507 | IDLE CONTROL SYSTEM, RPM GREATER THAN EXPECTED |
| P0511 | IDLE AIR CONTROL VALVE (IAC) CIRCUIT MALFUNCTION |
| P0603 | POWERTRAIN CONTROL MODULE (PCM), KEEP ALIVE MEMORY (KAM) TEST ERROR |
| P0605 | POWERTRAIN CONTROL MODULE MALFUNCTION (PCM), READ ONLY MEMORY (ROM), TEST ERROR |
| P0704 | CLUTCH SWITCH CIRCUIT MALFUNCTION |
| P0850 | NEUTRAL SWITCH INPUT CIRCUIT MALFUNCTION |
| P1001 | DATA LINK CONNECTOR (DLC) MALFUNCTION |
| P1100 | MASS AIRFLOW (MAF) SENSOR, INTERMITTENT MALFUNCTION |
| P1101 | MASS AIRFLOW (MAF) SENSOR, OUT OF RANGE |
| P1112 | INTAKE AIR TEMPERATURE (IAT), INTERMITTENT MALFUNCTION |
| P1116 | ENGINE COOLANT TEMPERATURE (ECT) SENSOR, OUT OF RANGE |
| P1117 | ENGINE COOLANT TEMPERATURE (ECT) SENSOR, INTERMITTENT MALFUNCTION |
| P1120 | THROTTLE POSITION (TP) SENSOR, OUT OF RANGE (LOW) |
| P1124 | THROTTLE POSITION (TP) SENSOR INCONSISTENT WITH RPM. GREATER THAN EXPECTED |
| P1125 | THROTTLE POSITION (TP) SENSOR, INTERMITTENT PROBLEM |
| P1127 | COLD EXHAUST |
| P1250 | FUEL PRESSURE REGULATOR CONTROL (PRC) SOLENOID VALVE CIRCUIT MALFUNCTION |
| P1410 | EGR BOOST SENSOR SOLENOID VALVE STUCK |
| P1450 | EVAPORATIVE CONTROL SYSTEM MALFUNCTION (VACUUM LEAK) |
| P1451 | CANISTER DRAIN CUT VALVE (CDCV) CIRCUIT MALFUNCTION |
| P1460 | WOT A/C CONTROL CIRCUIT MALFUNCTION & P1464: A/C DEMAND OUT OF RANGE |
| P1487 | EGR BOOST SENSOR SOLENOID VALVE CIRCUIT MALFUNCTION |
| P1504 | IDLE AIR CONTROL (IAC) VALVE CIRCUIT MALFUNCTION |
| P1506 | IDLE CONTROL SYSTEM, RPM LESS THAN EXPECTED |
| P1507 | IDLE CONTROL SYSTEM, RPM GREATER THAN EXPECTED |
| P1512 | VARIABLE TUMBLE CONTROL SYSTEM (VTCS) SHUTTER VALVE STUCK |
| P1569 | VARIABLE TUMBLE CONTROL SYSTEM (VTCS) SOLENOID VALVE, CIRCUIT MALFUNCTION |
| P1602 | IMMOBILIZER UNIT - PCM COMMUNICATION ERROR |
| P1603 | CODE WORD UNREGISTERED IN PCM |
| P1604 | KEY ID NUMBERS UNREGISTERED IN PCM |
| P1621 | CODE WORD DOES NOT MATCH AFTER ENGINE CRANKING |
| P1622 | KEY ID NUMBER DOES NOT MATCH |
| P1623 | CODE WORD OR KEY ID NUMBER READ/WRITE ERROR IN PCM |
| P1633 | POWERTRAIN CONTROL MODULE (PCM) KAM CIRCUIT, LOW VOLTAGE |
| P1650 | POWER STEERING PRESSURE (PSP) SWITCH, OUT OF RANGE |
| P1652 | POWER STEERING PRESSURE (PSP) SWITCH, FAILED ON |
| P1703 | BRAKE SWITCH, OUT OF RANGE |
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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