NHTSA ID Number: 11020669
Manufacturer Communication Number: L-SB-0009-24 Rev1
TSB/Document Date: 2025-07-10
Summary
Some 2021 – 2024 model year ES 250 and 2022 – 2024 model year NX 250 vehicles with A25A-FKS engines may have a MIL ON condition with one or more of the following Diagnostic Trouble Codes (DTCs) upon cold soak start up with engine coolant temperatures between 14°F – 41°F: •P030027 – Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change Above Threshold •P030000 – Random/Multiple Cylinder Misfire Detected •P030100 – Cylinder 1 Misfire Detected •P030200 – Cylinder 2 Misfire Detected •P030300 – Cylinder 3 Misfire Detected •P030400 – Cylinder 4 Misfire Detected
L-SB-0009-24
Rev1
February 21, 2024
MIL ON with Misfire DTC(s) in Cold Temperatures
Service
Category
Vehicle Interior
Section
Meter/Gauge/Display
Market USA
Applicability
YEAR(S)
MODEL(S)
2021 - 2024
ES250
2022 - 2024
NX250
ADDITIONAL INFORMATION
REVISION NOTICE
June 25, 2025 Rev1:
The Parts Information and Required Tools & Equipment sections have been updated.
Any previous printed versions of this bulletin should be discarded.
Introduction
Some 2021 – 2024 model year ES 250 and 2022 – 2024 model year NX 250 vehicles with
A25A-FKS engines may have a MIL ON condition with one or more of
the following Diagnostic Trouble Codes (DTCs) upon cold soak start up with engine coolant
temperatures between 14°F – 41°F:
P030027 – Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change
Above Threshold
P030000 – Random/Multiple Cylinder Misfire Detected
P030100 – Cylinder 1 Misfire Detected
P030200 – Cylinder 2 Misfire Detected
P030300 – Cylinder 3 Misfire Detected
P030400 – Cylinder 4 Misfire Detected
Follow the Repair Procedure in this bulletin to address these conditions.
© 2025 Lexus
, a division of Toyota Motor Sales, USA
Page 1 of 7
L-SB-0009-24
Rev1
February 21, 2024
Page 2 of 7
MIL ON with Misfire DTC(s) in Cold Temperatures
Warranty Information
OP CODE
DESCRIPTION
Model
TIME
Replace Valve Lash Adjuster Assembly
(Exhaust Side ONLY)
ES 250
3.4
EG2402
NX 250
3.1
OFP
T1
T2
13750-F0010
8A
99
APPLICABLE WARRANTY
This repair is covered under the Lexus Powertrain Warranty. This warranty is in effect for
72 months or 70,000 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.
Parts Information
PART NUMBER
PART NAME
QTY
Adjuster Assy, Valve Lash
8
90301-31016
Ring, O
1
90301-92005
Ring, O (for Cam Timing Control Motor)
1
90301-T0079
Ring, O (for Cam Timing Oil Control Solenoid)
1
29343-F0010
Ring, O Vacuum Pump, No. 1
1
23224-F0011
Gasket, Fuel Pump Spacer
1
11213-25020
Gasket, Cylinder Head Cover
1
11213-31080
Gasket, Cylinder Head Cover, No. 2
6
11159-0P040
Gasket, Camshaft Bearing Cap Oil Hole
1
PREVIOUS
NEW
13750-F0010
13750-70021
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0009-24
Rev1
February 21, 2024
Page 3 of 7
MIL ON with Misfire DTC(s) in Cold Temperatures
Required Tools & Equipment
REQUIRED EQUIPMENT
SUPPLIER
Techstream ADVi*
Techstream Lite
PART NUMBER
QTY
TSADVUNIT
ADE
Techstream Lite (Green Cable)
TSLITEPDLR01
1
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 or by visiting TIS – Diagnostics – Tools & Equipment – Techstream Order Portal.
Repair Procedure
1. Confirm the condition exists.
Does the vehicle exhibit a MIL ON condition one or more of the following DTCs present?
P030027 – Random/Multiple Cylinder Misfire Detected (Emission) Signal Rate of Change
Above Threshold
P030000 – Random/Multiple Cylinder Misfire Detected
P030100 – Cylinder 1 Misfire Detected
P030200 – Cylinder 2 Misfire Detected
P030300 – Cylinder 3 Misfire Detected
P030400 – Cylinder 4 Misfire Detected
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
2. Refer to the freeze frame data. Did the vehicle exhibit the MIL ON with engine coolant
temperatures between 14°F – 41°F?
YES — Continue to step 3.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0009-24
Rev1
February 21, 2024
MIL ON with Misfire DTC(s) in Cold Temperatures
Repair Procedure (continued)
3. Confirm the compression is within specification.
Refer to TIS, applicable model and model year Repair Manual:
NOTE
Perform ONLY step 11.
2021 – 2024 ES 250:
Engine / Hybrid System – A25A-FKS (Engine Mechanical) – Engine –
On-Vehicle Inspection
2022 – 2024 NX 250:
Engine / Hybrid System – A25A-FKS (Engine Mechanical) – Engine –
On-Vehicle Inspection
Is the compression within specifications?
YES — Continue to step 4.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
4. Confirm the spark plugs, and ignition coils are functioning properly.
Refer to TIS, applicable model and model year Repair Manual:
2021 – 2024 ES 250:
Engine / Hybrid System – A25A-FKS (Engine Control) – Ignition System –
On-Vehicle Inspection
2022 – 2024 NX 250:
Engine / Hybrid System – A25A-FKS (Engine Control) – Ignition System –
On-Vehicle Inspection
Is the vehicle exhibiting proper ignition?
YES — Continue to step 5.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
© 2025 Lexus, a division of Toyota Motor Sales, USA
Page 4 of 7
L-SB-0009-24
Rev1
February 21, 2024
Page 5 of 7
MIL ON with Misfire DTC(s) in Cold Temperatures
Repair Procedure (continued)
5. Confirm the resistance on the direct and port injectors are within specifications.
Refer to TIS, applicable model and model year Repair Manual:
2021 – 2024 ES 250:
Engine / Hybrid System – A25A-FKS (Fuel) –
Fuel Injector (for Direct Injection) – Inspection
2021 – 2024 ES 250:
Engine / Hybrid System – A25A-FKS (Fuel) –
Fuel Injector (for Port Injection) – Inspection
2022 – 2024 NX 250:
Engine / Hybrid System – A25A-FKS (Fuel) –
Fuel Injector (for Direct Injection) – Inspection
2022 – 2024 NX 250:
Engine / Hybrid System – A25A-FKS (Fuel) –
Fuel Injector (for Port Injection) – Inspection
Are the resistance values for the direct and port injectors within specifications?
YES — Continue to step 6.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
6. Inspect the fuel system.
Refer to TIS, applicable model and model year Repair Manual:
2021 – 2024 ES 250:
Engine / Hybrid System – A25A-FKS (Fuel) – Fuel System – On-Vehicle Inspection
2022 – 2024 NX 250:
Engine / Hybrid System – A25A-FKS (Fuel) – Fuel System – On-Vehicle Inspection
Is the fuel system within specification?
YES — Continue to step 7.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0009-24
Rev1
February 21, 2024
Page 6 of 7
MIL ON with Misfire DTC(s) in Cold Temperatures
Repair Procedure (continued)
7. Follow the Repair Manual to replace ALL the exhaust side hydraulic lash adjusters with the
applicable service part number listed above.
A. Remove the exhaust side hydraulic lash adjusters.
(1) Remove the camshaft.
Refer to TIS, applicable model and model year Repair Manual:
2021 / 2022 / 2023 – 2024 ES 250:
Engine / Hybrid System – A25A-FKS (Engine Mechanical) – Camshaft – Removal
2022 – 2024 NX 250:
Engine / Hybrid System – A25A-FKS (Engine Mechanical) – Camshaft – Removal
(2) Remove the hydraulic lash adjusters.
Refer to TIS, applicable model and model year Repair Manual:
2021 – 2024 ES 250:
Engine / Hybrid System – A25A-FKS (Engine Mechanical) –
Engine Unit – Disassembly
NOTE
Perform ONLY steps 45 and 46.
2022 – 2024 NX 250:
Engine / Hybrid System – A25A-FKS (Engine Mechanical) –
Engine Unit – Disassembly
NOTE
Perform ONLY steps 56 and 57.
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0009-24
Rev1
February 21, 2024
Page 7 of 7
MIL ON with Misfire DTC(s) in Cold Temperatures
Repair Procedure (continued)
B. Install the NEW exhaust side hydraulic lash adjusters.
(1) Install the NEW exhaust side hydraulic lash adjusters.
Refer to TIS, applicable model and model year Repair Manual:
2021 / 2022 – 2024 ES 250:
Engine / Hybrid System – A25A-FKS (Engine Mechanical) –
Engine Unit – Reassembly
NOTE
Perform ONLY steps 26 and 27.
2022 – 2024 NX 250:
Engine / Hybrid System – A25A-FKS (Engine Mechanical) –
Engine Unit – Reassembly
NOTE
Perform ONLY steps 27 and 28.
(2) Reinstall the camshaft.
Refer to TIS, applicable model and model year Repair Manual:
2021 – 2024 ES 250:
Engine / Hybrid System – A25A-FKS (Engine Mechanical) –
Camshaft – Installation
2022 – 2024 NX 250:
Engine / Hybrid System – A25A-FKS (Engine Mechanical) –
Camshaft – Installation
8. Using GTS+, clear ANY DTCs and then at coolant temperatures of 14°F – 41°F, confirm the
condition is no longer present.
Refer to TIS, applicable model and model year Repair Manual:
NOTE
Perform ONLY the Confirmation Driving Pattern steps.
2021 / 2022 – 2024 ES 250:
Engine / Hybrid System – A25A-FKS (Engine Control) – SFI System –
P030000,P030027,P030085-P030400; Random/Multiple Cylinder Misfire Detected”
2022 – 2023 / 2024 NX 250:
Engine / Hybrid System – A25A-FKS (Engine Control) – SFI System –
P030000,P030027,P030085-P030400; Random/Multiple Cylinder Misfire Detected
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TSB/Document ID: L-SB-0009-24 Rev1
Replacement Service Bulletin Number:
MFR Communication Date: 2025-06-25
MFR Internal Campaign ID/Software Version: L-SB-0009-24 Rev1
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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