Toyota prius 3rd gen Oxygen Sensor (Bank-1 Sensor-2) Assembly (D9)

Toyota Prius 3 ^rd Generation (XW30)

Oxygen Sensor (Bank-1 Sensor-2) Assembly Wiring Guide: DIY Pinout Diagram

What is: The Vehicle Oxygen Sensor (Bank-1 Sensor-2) Assembly is a downstream exhaust sensor mounted after the catalytic converter. It monitors oxygen levels in exhaust gases to evaluate catalytic converter efficiency. The sensor sends feedback to the ECM, helping maintain proper emissions control, detect catalyst faults, and ensure the vehicle meets emission standards without directly adjusting fuel mixture.

Oxygen Sensor (Bank-1 Sensor-2) Assembly (89465-47080)

Toyota Prius Gen 3 emissions oxygen sensor assembly image

Genuine Toyota oxygen sensor Bank-1 Sensor-2 close-up view

Toyota Prius 3rd gen oxygen sensor Bank-1 Sensor-2 part number 89465-47080

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1. Introduction

      The  Toyota Prius 3rd Generation Oxygen Sensor (Bank-1 Sensor-2) Assembly (Part No. 89465-47080) is a downstream exhaust sensor installed after the catalytic converter. Its primary role is to monitor oxygen concentration in exhaust gases to evaluate catalytic converter efficiency. The sensor provides feedback to the Engine Control Module (ECM), supporting accurate emission control and onboard diagnostics. Unlike the upstream air-fuel ratio sensor, it does not adjust fuel injection directly. Reliable operation of this sensor helps the Prius maintain low exhaust emissions, detect catalyst deterioration, and comply with emission regulations while ensuring optimal hybrid system performance and long-term exhaust system reliability.

Related parts and Accessories

• Engine Control Module (ECM):-Receives sensor signals and monitors catalyst efficiency
• Catalytic Converter :-Main component evaluated by the sensor
• Air-Fuel Ratio Sensor (Bank-1 Sensor-1):-Provides upstream exhaust data for comparison
• Exhaust Manifold & Exhaust Pipe:- Mounting and gas flow path
• Wiring Harness & Connector:-Transmits signal and heater power
• On-Board Diagnostics (OBD) System:- Uses data for fault detection and emissions monitoring

2. Oxygen Sensor (Bank-1 Sensor-2) Assembly Wiring Diagram & Pinout

A. Connector Location

• Oxygen Sensor (Bank-1 Sensor-2) Assembly Position: Mounted in the exhaust pipe downstream of the catalytic converter, underneath the vehicle.


• Connector Type:
  • D9 (4 pin) Gray housing

B. Wiring Table

Oxygen Sensor (Bank-1 Sensor-2) Assembly (D9)

D9 TERMINALS OF Oxygen Sensor (Bank-1 Sensor-2) Assembly CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
D9-1	HT1B	(BR) Brown	➔ D28 41 (HT1B) [Engine Control Module]
D9-2	+B	(B) Black	➔ ✠ ➔ DA2 4 ➳ 1 2 ➤ 10A Blade Fuse [EFI NO.2]
D9-3	OX1B	(L) Blue	➔ D28 125 (OX1B) [Engine Control Module]
D9-4	E2	(P) Pink	➔ D28 102 (O1B-) [Engine Control Module]

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