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 STRATEGY
2025 Toyota Highlander Hybrid XLE
Monitor Strategy
2025 Toyota Highlander Hybrid XLESECTION Monitor Strategy
| Related DTCs | P0489: EGR A circuit range check (low voltage) P0489: EGR B circuit range check (low voltage) P0490: EGR A circuit range check (high current) P0490: EGR B circuit range check (high current) |
| Required Sensors/Components (Main) | EGR valve assembly |
| Required Sensors/Components (Related) | - |
| Frequency of Operation | Continuous |
| Duration | 1 second |
| MIL Operation | Immediate |
| Sequence of Operation | None |
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.