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 MANUALSTOYOTA2025HIGHLANDER XLE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM (T24A-FTS) - DIAGNOSTIC CODES (04 OF 11)SFI SYSTEMDTC P0300-00: RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED; DTC P0300-27: RANDOM/MULTIPLE CYLINDER MISFIRE DETECTED (EMISSION) SIGNAL RATE OF CHANGE ABOVE THRESHOLD; DTC P0300-85: RANDOM / MULTIPLE CYLINDER MISFIRE DETECTED (OVER TEMPERATURE) SIGNAL ABOVE ALLOWABLE RANGE; DTC P0301-00: CYLINDER 1 MISFIRE DETECTED; DTC P0302-00: CYLINDER 2 MISFIRE DETECTED; DTC P0303-00: CYLINDER 3 MISFIRE DETECTED; DTC P0304-00: CYLINDER 4 MISFIRE DETECTED [10/2022 - 11/2023]WIRING DIAGRAM
2025 Toyota Highlander XLE, FWD
DTC P0300-00: Random/Multiple Cylinder Misfire Detected; DTC P0300-27: Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold; DTC P0300-85: Random / Multiple Cylinder Misfire Detected (Over Temperature) Signal Above Allowable Range; DTC P0301-00: Cylinder 1 Misfire Detected; DTC P0302-00: Cylinder 2 Misfire Detected; DTC P0303-00: Cylinder 3 Misfire Detected; DTC P0304-00: Cylinder 4 Misfire Detected [10/2022 - 11/2023]: Wiring Diagram
2025 Toyota Highlander XLE, FWDSECTION Wiring Diagram
Refer to DTC P0100-12 for the mass air flow meter sub-assembly circuit.
Refer to WIRING DIAGRAM
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.