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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 228 (Engine Control System (A25A-FXS) - Diagnostic Codes (09 Of 20)) >> SFI System >> DTC P0401-9C: Exhaust Gas Recirculation "A" Low / Insufficient Flow [06/2018 - 07/2019] >> Monitor Description

Monitor Description

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The ECM monitors the pressure inside the intake manifold while opening and closing the EGR valve during fuel cut operation. If there is no change in the manifold absolute pressure sensor value, the ECM interprets this as a malfunction of the EGR valve assembly, illuminates the MIL and stores this DTC.

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