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 HYBRID XLEREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM (A25A-FXS) - DIAGNOSTIC CODES (P0400-P0450)SFI SYSTEMDTC P0403-18: EXHAUST GAS RECIRCULATION "A" CIRCUIT CURRENT BELOW THRESHOLD; DTC P0403-19: EXHAUST GAS RECIRCULATION "A" CIRCUIT CURRENT ABOVE THRESHOLD; DTC P1400-18: EXHAUST GAS RECIRCULATION "A" CONTROL CIRCUIT 2 CIRCUIT CURRENT BELOW THRESHOLD; DTC P1400-19: EXHAUST GAS RECIRCULATION "A" CONTROL CIRCUIT 2 CIRCUIT CURRENT ABOVE THRESHOLD [12/2019 - 10/2022]MONITOR DESCRIPTION
2025 Toyota Highlander Hybrid XLE
Monitor Description
2025 Toyota Highlander Hybrid XLESECTION Monitor Description
These DTCs are stored if an open or short in the EGR valve assembly circuit is detected.
Example:
- If the EGA+, EGA-, EGB+ or EGB- operation signal is off, but the step motor output signal is on, the ECM determines that there is a short in the EGR valve assembly circuit, and stores a DTC P0403-19 or P1400-19.
- If the EGA+, EGA-, EGB+ or EGB- operation signal is on, and the step motor output signal is off, the ECM determines that there is an open or short in the EGR valve assembly circuit, and stores a DTC P0403-18 or P1400-18.
RENDER: 1.0x
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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.