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 MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 237 (ENGINE CONTROL SYSTEM SELF DIAGNOSTICS (1GR-FE))DIAGNOSTIC TESTSDTC P0031, DTC P0032, DTC P0051 & DTC P0052NOTES
2004 Toyota Matrix XR, FWD, Standard
DTC P0031, DTC P0032, DTC P0051 & DTC P0052: Notes
2004 Toyota Matrix XR, FWD, StandardSECTION Notes
WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
Code Definition
- DTC P0031: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1)
- DTC P0032: Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 1)
- DTC P0051: Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 1)
- DTC P0052: Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 1)
NOTE:
If DTCs related to MAF, IAT, TPS, ECT, HO2S and/or A/F sensor are output simultaneously, the E2 sensor ground circuit at ECM 34-pin connector E4 terminal No. 28 (Brown wire) may be open. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. For ECM connector terminal identification, see Figure.
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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.