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.
SYS.OK|MANUAL.DB● LIVE
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]DESCRIPTION
2025 Toyota Highlander Hybrid XLE
DTC 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]: Description
2025 Toyota Highlander Hybrid XLESECTION Description
Refer to DTC P0400-00.
Refer to DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P0403-18 | Exhaust Gas Recirculation "A" Circuit Current Below Threshold | Open or short in EGR A circuit for 1 second or more (1 trip detection logic). |
|
Comes on | DTC stored | SAE Code: P0489 |
| P0403-19 | Exhaust Gas Recirculation "A" Circuit Current Above Threshold | Short in EGR A circuit for 1 second or more (1 trip detection logic). |
|
Comes on | DTC stored | SAE Code: P0490 |
| P1400-18 | Exhaust Gas Recirculation "A" Control Circuit 2 Circuit Current Below Threshold | Open or short in EGR B circuit for 1 second or more (1 trip detection logic). |
|
Comes on | DTC stored | SAE Code: P0489 |
| P1400-19 | Exhaust Gas Recirculation "A" Control Circuit 2 Circuit Current Above Threshold | Short in EGR B circuit for 1 second or more (1 trip detection logic). |
|
Comes on | DTC stored | SAE Code: P0490 |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.