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
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
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.
- 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 |
|---|---|---|---|
| D24-1 | HA1A |
(Y) Yellow |
|
| D24-2 | +B | (B) Black |
|
| D24-3 | A1A+ | (Y) Yellow |
|
| D24-4 | A1A- | (BR) Brown |
|
3. DTC Error Codes Related to Bank-1 Sensor-1
Applies to the upstream Air-Fuel Ratio (A/F) sensor mounted on the exhaust manifold (Bank-1, Sensor-1).
| DTC Code | Description | Trouble Area |
|---|---|---|
| P0031 | Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1) |
|
| P0032 | Oxygen (A/F) Sensor Heater Control Circuit High (Bank 1 Sensor 1) |
|
| P2195 | Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1) |
|
| P2196 | Oxygen (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 1) |
|
| P2237 | Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1) |
|
| P2238 | Oxygen (A/F) Sensor Pumping Current Circuit Low (Bank 1 Sensor 1) |
|
| P2239 | Oxygen (A/F) Sensor Pumping Current Circuit High (Bank 1 Sensor 1) |
|
| P2252 | Oxygen (A/F) Sensor Reference Ground Circuit Low (Bank 1 Sensor 1) |
|
| P2253 | Oxygen (A/F) Sensor Reference Ground Circuit High (Bank 1 Sensor 1) |
|
Tech Tip: Always fix air/exhaust leaks, MAF contamination, and fuel pressure issues before condemning the A/F sensor. Clear codes and perform a drive cycle to confirm repair.
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