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.
2012 Nissan-Datsun Altima BaseFACTORY OEM SERVICE PROCEDURE
Engine Control System - Qr25DE (For MEXICO)
ENGINE CONTROL SYSTEM (QR25DE FOR MEXICO) DIAGNOSTIC TROUBLE CODES (DTC) LIST
| DTC | Description |
|---|---|
| DTC U0101 | CAN COMM CIRCUIT |
| DTC U1001 | CAN COMM CIRCUIT |
| DTC P0011 | IVT CONTROL |
| DTC P0031, P0032 | A/F SENSOR 1 HEATER |
| DTC P0037, P0038 | HO2S2 HEATER |
| DTC P0075 | IVT CONTROL SOLENOID VALVE |
| DTC P0102, P0103 | MAF SENSOR |
| DTC P0112, P0113 | IAT SENSOR |
| DTC P0117, P0118 | ECT SENSOR |
| DTC P0122, P0123 | TP SENSOR |
| DTC P0130 | A/F SENSOR 1 |
| DTC P0131 | A/F SENSOR 1 |
| DTC P0132 | A/F SENSOR 1 |
| DTC P0133 | A/F SENSOR 1 |
| DTC P0137 | HO2S2 |
| DTC P0138 | HO2S2 |
| DTC P0139 | HO2S2 |
| DTC P0171 | FUEL INJECTION SYSTEM FUNCTION |
| DTC P0172 | FUEL INJECTION SYSTEM FUNCTION |
| DTC P0222, P0223 | TP SENSOR |
| DTC P0300, P0301, P0302, P0303, P0304 | MISFIRE |
| DTC P0327, P0328 | KS |
| DTC P0335 | CKP SENSOR (POS) |
| DTC P0340 | CMP SENSOR (PHASE) |
| DTC P0420 | THREE WAY CATALYST FUNCTION |
| DTC P0444 | EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE |
| DTC P0500 | VSS |
| DTC P0506 | ISC SYSTEM |
| DTC P0507 | ISC SYSTEM |
| DTC P0550 | PSP SENSOR |
| DTC P0603 | ECM POWER SUPPLY |
| DTC P0605 | ECM |
| DTC P0607 | ECM |
| DTC P0643 | SENSOR POWER SUPPLY |
| DTC P0850 | PNP SWITCH |
| DTC P1217 | ENGINE OVER TEMPERATURE |
| DTC P1225 | TP SENSOR |
| DTC P1226 | TP SENSOR |
| DTC P1550 | BATTERY CURRENT SENSOR |
| DTC P1551, P1552 | BATTERY CURRENT SENSOR |
| DTC P1553 | BATTERY CURRENT SENSOR |
| DTC P1554 | BATTERY CURRENT SENSOR |
| DTC P1564 | ASCD STEERING SWITCH |
| DTC P1572 | ASCD BRAKE SWITCH |
| DTC P1574 | ASCD VEHICLE SPEED SENSOR |
| DTC P1715 | INPUT SPEED SENSOR |
| DTC P1805 | BRAKE SWITCH |
| DTC P2100, P2103 | THROTTLE CONTROL MOTOR RELAY |
| DTC P2101 | ELECTRIC THROTTLE CONTROL FUNCTION |
| DTC P2118 | THROTTLE CONTROL MOTOR |
| DTC P2119 | ELECTRIC THROTTLE CONTROL ACTUATOR |
| DTC P2122, P2123 | APP SENSOR |
| DTC P2127, P2128 | APP SENSOR |
| DTC P2135 | TP SENSOR |
| DTC P2138 | APP SENSOR |
| DTC P2A00 | A/F SENSOR 1 |
Factory Service Tools
Use the Manual With the Right Hardware
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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.