O2 Sensor Location & Identification Toyota 4Runner IV

Introduction

This article provides information on the proper identification of engine bank 1 and engine bank 2 for correct A/F sensor and oxygen sensor replacement.

This article contains information that identifies engine bank 1 and engine bank 2 on the following engines

1AZ-FE, 2AZ-FE, 2AZ-FE (PZEV), 1GR-FE, 2GR-FE, 2JZ-GE, 1MZ-FE, 3MZ-FE, 1UR-FE, 3UR-FE, 2UZ-FE, 5VZ-FE, and 1ZZ-FE.

1. Bank 1 (B1) refers to the bank that includes cylinder No. 1.
2. Bank 2 (B2) refers to the bank opposite bank 1.
3. Sensor 1 (S1) refers to the sensor that is located before the catalytic converters.
4. Sensor 2 (S2) refers to the sensor that is located after the catalytic converters.

Applicable Vehicles

MODEL INFORMATION

Engine Bank Identification - 1UR-FE, 3UR-FE, 2UZ-FE. Scheme 1

Engine Bank Identification - 2GR-FE, 1MZ-FE, 3MZ-FE. Scheme 2

Engine Bank Identification - 1GR-FE, 5VZ-FE. Scheme 3

Engine Bank Identification - 2JZ-GE. Scheme 4

Engine Bank Identification - 1ZZ-FE. Scheme 5

Engine Bank Identification - 1AZ-FE. Scheme 6

Engine Bank Identification - 2AZ-FE. Scheme 7

A/F And O2 Sensor Identification - FWD V6. Scheme 8

A/F And O2 Sensor Identification - 2AZ-FE PZEV. Scheme 9