Diagnostic Trouble Codes
SAE J2012 Standard OBD Codes
Mazda Proprietary OBD Codes
OBD Information & Code Reading
P0100 - Mass-airflow (MAF) sensor circuit malfunction
P0105 - Manifold absolute pressure (MAP) sensor circuit malfunction
P0110 - Intake air temperature (IAT) sensor circuit malfunction - air filter box
P0115 - Engine coolant temperature (ECT) sensor circuit malfunction
P0120 - Throttle position sensor (TPS) circuit malfunction
P0125 - Low engine coolant temperature (ECT) signal inhibiting closed loop fuel control
P0130 - Oxygen sensor circuit malfunction - upstream of catalyst (front) / rear (RH) bank
P0134 - Oxygen sensor no activity detected - upstream of catalyst (front) / rear (RH) bank
P0135 - Oxygen sensor heater circuit malfunction - upstream of catalyst (front) / rear (RH) bank
P0136 - Oxygen sensor circuit malfunction - upstream of catalyst (middle) / rear (RH) bank
P0138 - Oxygen sensor circuit high input - downstream of catalyst (rear) / rear (RH) bank
P0140 - Oxygen sensor no activity detected
P0141 - Oxygen sensor heater circuit malfunction
P0146 - Oxygen sensor no activity detected - downstream of catalyst (rear)
P0147 - Oxygen sensor heater circuit malfunction - downstream of catalyst (rear)
P0150 - Oxygen sensor circuit malfunction - upstream of catalyst (front) / front (LH) bank
P0154 - Oxygen sensor no activity detected - upstream of catalyst (front) / front (LH) bank
P0155 - Oxygen sensor heater circuit malfunction - upstream of catalyst (front) / front (LH) bank
P0158 - Oxygen sensor circuit high input - downstream of catalyst (rear) / front (LH) bank
P0160 - Oxygen sensor no activity detected - downstream of catalyst (rear) / front (LH) bank
P0161 - Oxygen sensor heater circuit malfunction - downstream of catalyst (rear) / front (LH) bank
P0170 - Fuel trim malfunction - rear (RH) bank
P0173 - Fuel trim malfunction - front (LH) bank
P0300 - Random combustion misfire detected
P0301 - Combustion misfire detected - Cylinder #1
P0302 - Combustion misfire detected - Cylinder #2
P0303 - Combustion misfire detected - Cylinder #3
P0304 - Combustion misfire detected - Cylinder #4
P0305 - Combustion misfire detected - Cylinder #5
P0306 - Combustion misfire detected - Cylinder #6
P0325 - Knock sensor circuit malfunction
P0335 - Crankshaft position (CKP) sensor circuit malfunction
Emission Control & Auxiliary Inputs
P0400 - Exhaust gas recirculation (EGR) system malfunction
P0404 - Exhaust gas recirculation (EGR) range/performance malfunction
P0420 - Catalyst performance below threshold
P0421 - Catalyst performance below threshold - rear (RH) bank
P0430 - Catalyst performance below threshold - front (LH) bank
P0431 - Catalyst performance below threshold - front (LH) bank
P0440 - Evaporative emission control system malfunction
P0442 - Evaporative emission control system (small) leak detected
P0443 - Evaporative emission control system purge solenoid valve circuit malfunction
P0446 - Evaporative emission control system purge control valve circuit malfunction
P0450 - Fuel tank pressure sensor circuit malfunction
P0451 - Fuel tank pressure sensor malfunction
P0455 - Evaporative emissions control system leak (large leak or blockage) detected
P0464 - Fuel gauge sender unit circuit intermittent (slosh check)
P0480 - Condenser fan relay #1 control circuit malfunction
P0481 - Cooling fan relay #1 and/or condenser fan relay #2 control circuit malfunction
P0482 - Cooling and/or condenser fan relay control circuit malfunction
Vehicle Speed, Idle Control, & Auxiliary Inputs
P0500 - Vehicle (speedometer) speed sensor (VSS) circuit malfunction
P0505 - Idle-air control (IAC) circuit malfunction
P0510 - Closed throttle position switch circuit malfunction
P0550 - Power steering pressure switch circuit malfunction
P0703 - Brake pedal switch circuit malfunction
P0705 - Gear range switch circuit malfunction
P0706 - Gear range switch circuit malfunction
P0710 - ATF temperature sensor circuit malfunction
P0711 - ATF temperature sensor circuit malfunction (output frozen)
P0715 - Speed input (turbine) sensor circuit malfunction
P0720 - Speed output sensor circuit malfunction
P0725 - Engine speed input circuit malfunction (ABS/TCS DTC 17)
P0730 - Incorrect gear ratio
P0731 - 1st gear - incorrect ratio
P0732 - 2nd gear - incorrect ratio
P0733 - 3rd gear - incorrect ratio
P0734 - 4th gear - incorrect ratio
P0740 - Torque converter clutch (TCC) system malfunction
P0745 - Pressure control solenoid circuit malfunction
P0750 - Shift solenoid A circuit malfunction
P0755 - Shift solenoid B circuit malfunction
P0760 - Shift solenoid C circuit malfunction
Air/Fuel/Ignition Control & Auxiliary Inputs
P1000 - System readiness function not yet complete
P1110 - Intake air temperature sensor circuit malfunction - dynamic chamber
P1113 - Intake air temperature sensor circuit malfunction - Lysholm compressor
P1169 - Oxygen sensor inversion not detected - upstream of catalyst (middle) / rear (RH) bank
P1170 - Oxygen sensor inversion not detected - upstream of catalyst (front) / rear (RH) bank
P1173 - Oxygen sensor inversion not detected - upstream of catalyst (front) / front (LH) bank
P1195 - Barometric pressure (EGR boost) sensor circuit malfunction
P1196 - Starter signal circuit malfunction
P1248 - Charged-air pressure sensor signal error (ABS/TCS code 84)
P1250 - Fuel pressure regulator control (PRC) solenoid valve circuit malfunction
P1345 - Camshaft position (CMP/SGC) sensor circuit malfunction
P1364 - Coil-on-plug (COP) control circuit - ignition feedback (IGF) signal error
Emission Control & Auxiliary Inputs
P1402 - Exhaust gas recirculation (EGR) valve position sensor circuit malfunction
P1449 - Evaporative emission canister drain/cut valve (CDCV) circuit malfunction
P1450 - Evaporative emission control system malfunction (excessive vacuum)
P1455 - Fuel gauge sender unit circuit malfunction
P1485 - Exhaust gas recirculation (EGR) vacuum solenoid valve circuit malfunction
P1486 - Exhaust gas recirculation (EGR) vent solenoid valve circuit malfunction
P1487 - Exhaust gas recirculation (EGR) boost sensor solenoid valve circuit malfunction
P1508 - Bypass air solenoid valve #1 circuit malfunction
P1509 - Bypass air solenoid valve #2 circuit malfunction
P1521 - Variable resonance induction system (VRIS) solenoid valve #1 circuit malfunction
P1522 - Variable resonance induction system (VRIS) solenoid valve #2 circuit malfunction
P1524 - Charged-air cooler (CAC) bypass solenoid valve circuit malfunction
P1525 - Lysholm air bypass valve (ABV) vacuum solenoid circuit malfunction
P1526 - Lysholm air bypass valve (ABV) vent solenoid circuit malfunction
P1529 - Lysholm atmospheric balance air control solenoid valve circuit malfunction
P1540 - Lysholm air bypass valve (ABV) control system malfunction
P1566 - Transmission control module (TCM) B+ voltage too low
P1601 - Transmission control module (TCM) - engine control unit (ECU) communication error
P1608 - Engine control unit (ECU) internal malfunction (DTCs unreadable)
P1609 - Engine control unit (ECU) internal malfunction (knock control circuit)
P1627 - Anti-lock brake system (ABS) / traction control system (TCS) module - engine control unit (ECU) communication error (ABS/TCS DTC 82)
P1628 - Anti-lock brake system (ABS) / traction control system (TCS) module - engine control unit (ECU) communication error
Transmission Control & Auxiliary Inputs
P1720 - Vehicle (speedometer) speed sensor (VSS) circuit malfunction
P1743 - Torque converter clutch (TCC) control solenoid valve circuit malfunction
P1744 - Torque converter clutch (TCC) control solenoid valve circuit malfunction
P1765 - 3-2 downshift timing solenoid valve circuit malfunction
P1770 - Overrunning clutch solenoid valve malfunction
P1775 - Upshift torque reduction request signal error (TPS)
P1776 - Downshift torque reduction request signal error (TPS)
P1777 - Torque reduced signal error (ECT sensor)
P1790 - Throttle position sensor (TPS) malfunction
P1792 - Throttle position sensor (TPS) malfunction
P1794 - Engine control unit (ECU) B+ voltage low
P1795 - Closed throttle position switch malfunction
P1797 - Transmission park/neutral (inhibitor) signal (PNS) error
B1318 (63) - ABS/TCS control module power supply
B1342 (61) - ABS/TCS control module
C1095 (54) - ABS motor or motor relay
C1096 (53) - ABS motor or motor relay
C1117 (17) - Engine speed input circuit failure
C1118 (82) - Torque reduction request signal line error
C1119 (83) - Torque reduction inhibit signal line error
C1140 (30) - ABS pump or left front/right rear brake line
C1145 (11) - Right front wheel-speed sensor or sensor rotor
C1148 (41) - Right front wheel-speed sensor or sensor rotor
C1155 (12) - Left front wheel-speed sensor or sensor rotor
C1158 (42) - Left front wheel-speed sensor or sensor rotor
C1165 (13) - Right rear wheel-speed sensor or sensor rotor
C1168 (43) - Right rear wheel-speed sensor or sensor rotor
C1175 (14) - Left rear wheel-speed sensor or sensor rotor
C1178 (44) - Left rear wheel-speed sensor or sensor rotor
C1186 (51) - Fail-safe relay
C1194 (24) - Left front pressure retention solenoid valve
C1198 (25) - Left front pressure retention solenoid valve
C1210 (22) - Right front pressure reduction solenoid valve
C1214 (23) - Right front pressure retention solenoid valve
C1233 (46) - Left front wheel-speed sensor or sensor rotor
C1234 (45) - Right front wheel-speed sensor or sensor rotor
C1235 (47) - Right rear wheel-speed sensor or sensor rotor
C1236 (48) - Left rear wheel-speed sensor or sensor rotor
C1242 (28) - Left rear pressure reduction solenoid valve
C1246 (26) - Right rear pressure reduction solenoid valve
C1250 (29)
C1254 (27) - Right rear pressure retention solenoid valve
C1266 (52) - Fail-safe relay
C1510 (32) - Right front solenoid valve, wheel-speed sensor, sensor rotor, or ABS pump
C1511 (33) - Left front solenoid valve, wheel-speed sensor, sensor rotor, or ABS pump
C1512 (34) - Right rear solenoid valve, wheel-speed sensor, sensor rotor, or ABS pump
C1513 (35) - Left rear solenoid valve, wheel-speed sensor, sensor rotor, or ABS pump
U2021 (87) - Engine coolant temperature at or below 0°C (32°F)