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ENGINE

EG010-04

Title:

Technical Service Information Bulletin

September 3, 2004

ENGINE BANK 1 AND BANK 2 A/F AND O2 IDENTIFICATION

Models:

Applicable Models

Introduction

This service bulletin provides information on the proper identification of engine bank 1 and engine bank 2 for correct A/F sensor and oxygen sensor replacement. This bulletin contains information that identifies engine bank 1 and engine bank 2 on the following engines: 1MZ­FE, 3MZ­FE, 1UZ­FE, 2UZ­FE and 3UZ­FE. S Bank 1 (B1) refers to the bank that includes cylinder No. 1. S Bank 2 (B2) refers to the bank opposite bank 1. S Sensor 1 (S1) refers to the sensor that is located before the catalytic converters. S Sensor 2 (S2) refers to the sensor that is located after the catalytic converters.

Applicable Vehicles

S 1994 ­ 2003 model year ES 300 vehicles equipped with 1MZ­FE engine. S 2004 model year ES 330 and RX 330 vehicles equipped with 3MZ­FE engine. S 1998 ­ 2000 model year GS 400 vehicles equipped with 1UZ­FE engine. S 2003 ­ 2004 model year GX 470 vehicles equipped with 2UZ­FE engine. S 1990 ­ 2000 model year LS 400 vehicles equipped with 1UZ­FE engine. S 2001 ­ 2004 model year LS 430 and GS 430 vehicles equipped with 3UZ­FE engine. S 1998 ­ 2004 model year LX 470 vehicles equipped with 2UZ­FE engine. S 1999 ­ 2003 model year RX 300 vehicles equipped with 1MZ­FE engine. S 1992 ­ 2000 model year SC 400 vehicles equipped with 1UZ­FE engine. S 2002 ­ 2004 model year SC 430 vehicles equipped with 3UZ­FE engine.

Warranty Information

OP CODE

DESCRIPTION

TIME

OFP

T1

T2

N/A

Not Applicable to Warranty

­

­

­

­

Lexus Supports ASE Certification

Page 1 of 3

ENGINE BANK 1 AND BANK 2 A/F AND O2 IDENTIFICATION ­ EG010-04 Engine Bank Identification

September 3, 2004

1UZ­FE, 2UZ­FE and 3UZ­FE Engine Bank Identification

Bank 2 No. 8 Cylinder No. 6 Cylinder No. 4 Cylinder No. 2 Cylinder

Bank 1

No. 7 Cylinder No. 5 Cylinder No. 3 Cylinder No. 1 Cylinder

Front of Vehicle

1MZ­FE and 3MZ­FE Engine Bank Identification Bank 1 No. 1 Cylinder No. 3 Cylinder No. 5 Cylinder

No. 2 Cylinder Front of Vehicle

No. 4 Cylinder Bank 2

No. 6 Cylinder

Page 2 of 3

ENGINE BANK 1 AND BANK 2 A/F AND O2 IDENTIFICATION ­ EG010-04 Engine Bank Identification (Continued)

September 3, 2004

5VZ­FE and 1GR­FE Engine Bank Identification

Bank 1

Bank 2

No. 5 Cylinder

No. 6 Cylinder

No. 3 Cylinder No. 1 Cylinder

No. 4 Cylinder

No. 2 Cylinder

Front of Vehicle

A/F and O2 Sensor Identification

Sensor Identification (Example of FWD V6)

A/F Sensor (Bank 2, Sensor 1) (B2, S1)

A/F Sensor (Bank 1, Sensor 1) (B1, S1)

Heated Oxygen Sensor (Bank 1, Sensor 2) (B1, S2) TWC

Front of Vehicle

Heated Oxygen Sensor (Bank 2, Sensor 2) (B2, S2)

Page 3 of 3

Information

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