Mil On With DTC P042000 (L-SB-0053-22)

Publication date: 2022-10-31
Reference number: L-SB-0053-22

MIL ON WITH DTC P042000

TECHNICAL SERVICE BULLETIN

Reference Number(s): L-SB-0053-22, Date of Issue: October 31, 2022

LEXUS:	2021-2023 ES250; 2019-2023 ES300H
SERVICE CATEGORY:	Engine/Hybrid System
SECTION:	Emission Control
MARKET:	USA and Mexico
COPYRIGHT:	© 2022 Lexus, a division of Toyota Motor Sales, USA License Agreement TMS1002

APPLICABILITY

YEAR(S)	MODEL(S)	ADDITIONAL INFORMATION
2021 - 2023	ES250
2019 - 2023	ES300H

INTRODUCTION

The purpose of this bulletin is to supplement the diagnostic and repair procedure in the Repair Manual for the subject Diagnostic Trouble Code (DTC). Some 2021 - 2023 model year ES 250 and 2019 - 2023 model year ES 300h vehicles equipped with an A25A-FKS or A25A-FXS engine may exhibit a MIL ON condition with DTC P042000 (Catalyst System Efficiency Below Threshold Bank 1) present. Follow the Repair Procedure in this bulletin to address this condition.

WARRANTY INFORMATION

For USA and Mexico Markets

WARRANTY INFORMATION

OP CODE	DESCRIPTION	TIME	OFP	T1	T2
N/A	Not Applicable to Warranty	-	-	-	-

PARTS INFORMATION

For USA and Mexico Markets

PARTS INFORMATION

PART NUMBER	PART NAME	QTY
89467-0E250 89467-33210 89467-06210 89467-06280	Sensor, Air Fuel Ratio	1

REQUIRED TOOLS & EQUIPMENT

REQUIRED EQUIPMENT

SUPPLIER

PART NUMBER

QTY

Techstream ADVI⁽¹⁾

ADE

TSADVUNIT

Techstream 2.0

TS2UNIT

Techstream Lite

TSLITEPDLR01

Techstream Lite (Green Cable)

TSLP2DLR01

⁽¹⁾	Essential SST.

NOTE:

Only ONE of the Techstream units listed above is required.
Software version 17.20.013 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).

REPAIR PROCEDURE

Using Techstream, check for stored DTCs.
Is 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.
Are ANY other DTCs present?
- YES - Troubleshoot the other DTC(s) BEFORE continuing to step 3.
- NO - Continue to step 3.
Read the freeze frame data for DTC P042000.
Is the stored Long FT B1S2 1% or higher?
- YES - Continue to step 5.
- NO - This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.
Are there ANY exhaust gas leaks present?
- YES - This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.
- NO - Continue to step 6.
Replace the air fuel ratio sensor (sensor 2).
Refer to TIS, applicable model and model year Repair Manual:
- 2021 - 2023 ES 250:
  Engine/Hybrid Control - Engine Control - " A25A-FKS (Engine Control): Air Fuel Ratio Sensor (for Sensor 2): Removal/Installation "
- 2019 - 2023 ES 300h:
  Engine/Hybrid Control - Engine Control - " A25A-FXS (Engine Control): Air Fuel Ratio Sensor (for Sensor 2): Removal/Installation "
Using Techstream, clear DTC P042000.
Confirm the malfunction has been repaired successfully.
1. Drive the vehicle in accordance with the confirmation driving pattern described in the appropriate Repair Manual.
2. Check for ANY DTCs and confirm the condition no longer exists.