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 [03/2023 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.

Refer to DTC P0400-00.

Refer to DTC P0400-00: Exhaust Gas Recirculation "A" Flow; DTC P0401-9C: Exhaust Gas Recirculation "A" Low / Insufficient Flow; DTC P0402-9B: Exhaust Gas Recirculation "A" High/Excessive Flow [03/2022 - ]

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	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).	Open or short in EGR valve assembly circuit EGR valve assembly ECM	Comes on	SAE Code: P0489 DTC for Mexico Models: Applies
P0403-19	Exhaust Gas Recirculation "A" Circuit Current Above Threshold	Short in EGR A circuit for 1 second or more (1 trip detection logic).	Short in EGR valve assembly circuit EGR valve assembly ECM	Comes on	SAE Code: P0490 DTC for Mexico Models: Applies
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).	Open or short in EGR valve assembly circuit EGR valve assembly ECM	Comes on	SAE Code: P0489 DTC for Mexico Models: Applies
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).	Short in EGR valve assembly circuit EGR valve assembly ECM	Comes on	SAE Code: P0490 DTC for Mexico Models: Applies