NHTSA ID Number: 11021725
Manufacturer Communication Number: L-SB-0030-25
TSB/Document Date: 2025-08-08
Summary
Some 2024 model year NX 350 vehicles equipped with a T24A-FTS engine may exhibit a MIL ON condition with Diagnostic Trouble Code (DTC) P042000 (Catalyst System Efficiency Below Threshold Bank 1) present. The Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) logic has been modified to reduce the possibility of this condition.
L-SB-0030-25
July 23, 2025
MIL ON With DTC P042000 (Catalyst System Efficiency
Below Threshold Bank 1)
Service
Category
Vehicle Interior
Section
Meter/Gauge/Display
Market USA and
Mexico
Applicability
YEAR(S)
MODEL(S)
2024
NX350
ADDITIONAL INFORMATION
Introduction
Some 2024 model year NX 350 vehicles equipped with a T24A-FTS engine may exhibit a MIL ON
condition with Diagnostic Trouble Code (DTC) P042000 (Catalyst System Efficiency Below
Threshold Bank 1) present. The Engine Control Module (ECM) (SAE term: Powertrain Control
Module/PCM) logic has been modified to reduce the possibility of this condition. Follow the Repair
Procedure in this bulletin to address this condition.
© 2025 Lexus
, a division of Toyota Motor Sales, USA
Page 1 of 5
L-SB-0030-25
July 23, 2025
Page 2 of 5
MIL ON With DTC P042000 (Catalyst System Efficiency Below Threshold Bank
1)
Warranty Information
For USA Market
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
EL2513
Engine ECU Reprogramming and
Confirmation Driving Pattern
1.2
89661-#####*
8A
74
*Warranty claim MUST be submitted with the correct 10-digit OFP. Choose the correct OFP for the vehicle being repaired
by searching for the parts in the Electronic Parts Catalog using the VIN filter.
APPLICABLE WARRANTY
This repair is covered under the Lexus Emission Warranty. This warranty is in effect for
96 months or 80,000 miles, whichever occurs first, from the vehicle’s in-service date.
Warranty application is limited to occurrence of the specified condition described in
this bulletin.
For Mexico Market
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
EL2513
Engine ECU Reprogramming and
Confirmation Driving Pattern
1.2
89661-#####*
8A
74
*Warranty claim MUST be submitted with the correct 10-digit OFP. Choose the correct OFP for the vehicle being repaired
by searching for the parts in the Electronic Parts Catalog using the VIN filter.
APPLICABLE WARRANTY
This repair is covered under the Lexus Basic Warranty. This warranty is in effect for
48 months or 80,000 kilometers, whichever occurs first, from the vehicle’s in-service date.
Warranty application is limited to occurrence of the specified condition described in
this bulletin.
Parts Information
PART NUMBER
PART NAME
QTY
89661-#####
Computer, Engine Control (ECM/PCM)
–
NOTE
The ECM (PCM) should NOT be replaced as part of the Repair Procedure.
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0030-25
July 23, 2025
Page 3 of 5
MIL ON With DTC P042000 (Catalyst System Efficiency Below Threshold Bank
1)
Required Tools & Equipment
SPECIAL SERVICE TOOLS (SST)
PART NUMBER
QTY
DCA-8000 Battery Diagnostic Tool*
DCA-8000P T
1
*Essential SST.
NOTE
Additional SSTs may be ordered by calling 1-800-368-6787 (USA) or 01-800-504-5330 (Mexico) or by
visiting Home – Service Resources – Lexus Tools and Equipment Program.
REQUIRED EQUIPMENT
SUPPLIER
Techstream ADVi*
Techstream Lite
PART NUMBER
QTY
TSADVUNIT
ADE
Techstream Lite (Green Cable)
TSLITEPDLR01
TSLP2DLR01
*Essential SST.
NOTE
Only ONE of the Techstream units listed above is required.
GTS+ software version 2025.01.005.02 or later is required.
Additional Techstream units may be ordered by calling Approved Dealer Equipment (ADE)
at 1-800-368-6787 (USA) or 01-55-50103041 (Mexico) or by visiting TIS – Diagnostics –
Tools & Equipment – Techstream Order Portal.
Use Techstream or an approved J2534 interface to perform flash reprogramming updates.
Visit techinfo.toyota.com for more information regarding J2534 reprogramming.
© 2025 Lexus, a division of Toyota Motor Sales, USA
1
L-SB-0030-25
July 23, 2025
Page 4 of 5
MIL ON With DTC P042000 (Catalyst System Efficiency Below Threshold Bank
1)
Calibration Information
MODEL
MODEL
YEAR
ENGINE
PRODUCTION
COUNTRY
CALIBRATION ID
TYPE
PREVIOUS
NEW
F Sport
8A222F606000
8A222F606100
8A222F606200
8A222F606300
Non-F Sport
8A222F605000
8A222F605100
8A222F605200
8A222F605300
F Sport
8A2227815000
8A2227815100
8A2227815200
8A2227815300
8A2227815400
Non-F Sport
8A2227811000
8A2227811100
8A2227811200
8A2227811300
8A2227811400
North America
NX 350
2024
T24A-FTS
Japan
Repair Procedure
1. Confirm the condition exists.
Does the vehicle exhibit a MIL ON condition with DTC P042000 (Catalyst System Efficiency
Below Threshold Bank 1) present?
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
2. Use GTS+ to confirm if the ECM (PCM) calibration has been updated.
Is the calibration ID listed in GTS+ the latest ECM (PCM) calibration?
YES — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
NO — Continue to step 3.
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0030-25
July 23, 2025
Page 5 of 5
MIL ON With DTC P042000 (Catalyst System Efficiency Below Threshold Bank
1)
Repair Procedure (continued)
3. Flash reprogram the ECM (PCM).
NOTE
The battery diagnostic tool MUST be used in Power Supply Mode to maintain battery voltage
at 13.5V while flash reprogramming the vehicle.
For details on how to use the battery diagnostic station, refer to the DCA-8000 Instruction Manual
located at TIS – Diagnostics – Tools & Equipment – Battery Diagnostics.
Follow the procedures outlined in Service Bulletin L-SB-0036-22, GTS+ ECU Flash
Reprogramming With Security Signature, and flash reprogram the ECM (PCM) with the NEW
calibration file update.
4. Using GTS+, clear ANY DTCs and test-drive the vehicle in accordance with the confirmation
driving pattern to confirm the condition is no longer present.
Refer to TIS, applicable model and model year Repair Manual:
2024 NX 350:
Engine / Hybrid System – T24A-FTS (Engine Control) –
SFI System – P042000; Catalyst System Efficiency Below Threshold Bank 1
Does the vehicle exhibit a MIL ON with DTC P042000 (Catalyst System Efficiency Below
Threshold Bank 1) present?
YES — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
NO — The vehicle is repaired.
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TSB/Document ID: L-SB-0030-25
Replacement Service Bulletin Number:
MFR Communication Date: 2025-07-23
MFR Internal Campaign ID/Software Version: L-SB-0030-25
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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