Toyota prius 3rd gen Air fuel Ratio Sensor (Blank 1 Sensor 1) Assembly (D24)

Toyota Prius 3 ^rd Generation (XW30)

Air fuel Ratio Sensor (Blank 1 Sensor 1) Assembly Wiring Guide: DIY Pinout Diagram

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What is:The Air-Fuel Ratio Sensor (Bank 1 Sensor 1) Assembly is a key exhaust component located upstream of the catalytic converter on Bank 1 (the side of the engine with cylinder 1). It measures the precise oxygen concentration in the exhaust gases to determine the air-to-fuel ratio of the engine. The Engine Control Module (ECM) uses this data to adjust fuel injection and ignition timing, ensuring efficient combustion, better fuel economy, and reduced emissions.

Air fuel Ratio Sensor (Blank 1 Sensor 1) Assembly – Most Common in (XW30)

Toyota Prius XW30 Air Fuel Ratio Sensor 89467-52060 Bank 1 Sensor 1

OEM Toyota 89467-52060 Air Fuel Ratio Sensor upstream sensor

Genuine Toyota Air Fuel Ratio Sensor 89467-52060 location under hood

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1. Introduction

The Toyota Prius 3rd generation Air-Fuel Ratio Sensor (Bank 1 Sensor 1), also known as the upstream oxygen sensor, is a highly sensitive component installed on the exhaust manifold, before the catalytic converter. Its main function is to accurately measure the amount of oxygen in the exhaust gases and provide real-time feedback to the Engine Control Module (ECM). Unlike conventional oxygen sensors, this wideband sensor offers precise readings across a broad range of air-fuel mixtures, allowing the ECM to make quick and accurate adjustments to the fuel injection and ignition timing. This helps maintain the ideal stoichiometric ratio (14.7:1) for efficient combustion. As a result, the engine achieves better fuel economy, lower emissions, and smoother performance. The sensor plays a vital role in the Prius hybrid system, ensuring both environmental friendliness and optimal engine efficiency by keeping the exhaust system and catalytic converter functioning properly.

Related parts and Accessories

• Exhaust Manifold Assembly – The sensor is mounted on this part to monitor exhaust gases.
• Catalytic Converter (Front / Upstream) – Works with the sensor to reduce harmful emissions.
• Engine Control Module (ECM)– Receives signals from the sensor to adjust air-fuel mixture.
• Sensor Wiring Harness & Connector – Connects the sensor to the ECM for signal transmission.
• Exhaust Pipe Gaskets & Bolts – Ensure proper sealing and connection between exhaust components.
• Heat Shield – Protects the sensor and wiring from excessive exhaust heat.

2. Air fuel Ratio Sensor (Blank 1 Sensor 1) Assembly Wiring Diagram & Pinout

A. Connector Location

• Air fuel Ratio Sensor (Blank 1 Sensor 1) Assembly Mounting Location: Directly on the exhaust manifold (upstream position) — before the catalytic converter.
• Connector Type:
  • D24 (4 pin) Dark Gray housing

B. Wiring Table

Air fuel Ratio Sensor (Blank 1 Sensor 1) Assembly (D24)

D24 TERMINALS OF Air fuel Ratio Sensor (Blank 1 Sensor 1) Assembly CONECTOR

Terminal No	Symbol (Pin Definition)	Wiring (Color Code) & Color	Electrical Paths
1	HA1A	(Y) Yellow	➔ D28 18 (HA1A) [Engine Control Module]
2	+B	(B) Black	➔ ✠ ➔ DA2 4 ➳ 1 2 ➤ 10A Blade Fuse [EFI NO.2]
3	A1A+	(Y) Yellow	➔ D28 103 (A1A+) [Engine Control Module]
4	A1A-	(BR) Brown	➔ D28 126 (A1A-) [Engine Control Module]

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