Lexus RX 400h RX400H89663-48311_Denso_123555_nocat_noevap_dtc.bin Firmware
A catalog reference for the Lexus RX 400h Denso calibration 89663-48311 and its no-cat, no-EVAP DTC variant labels.
RX400H89663-48311_Denso_123555_nocat_noevap_dtc.bin is a modified-labeled engine control calibration for the Lexus RX 400h. The nocat_noevap_dtc suffix indicates a file associated with catalyst and evaporative emissions diagnostic trouble code changes.
Engine control and emissions diagnostics
The RX 400h uses an engine control module alongside its hybrid control system. The engine controller manages combustion-related functions and emissions monitoring, while the hybrid system coordinates engine operation with the electric drive. The catalog identifier 89663-48311 identifies the calibration family associated with this file.
The nocat label commonly refers to catalyst-related diagnostics, and noevap_dtc points to evaporative emissions system trouble codes. The EVAP system controls fuel vapor emissions, while catalyst monitoring checks emissions-control performance. Changes to their diagnostics can affect which faults are reported, without necessarily changing the physical condition of either system.
The filename does not establish which individual monitors or trouble codes were changed. It also does not identify a stock calibration or demonstrate compatibility with a particular vehicle beyond the RX 400h designation.