This Lambda Sensor (Oxygen / O₂ Sensor) with OE part number 89465-12640 is a genuine Toyota / Lexus original equipment component designed for the upstream (pre-catalyst / front) position. As a heated, switching-type regulating sensor, it delivers precise air-fuel ratio feedback to the ECU, supporting efficient combustion and reduced cold-start emissions.

• This is a 4-wire heated oxygen sensor manufactured to Toyota and Lexus original equipment standards. The four wires serve two independent circuits — two for the internal heater and two for the sensor signal and ground.
• The built-in heating element quickly brings the ceramic sensing tip up to operating temperature after a cold start, enabling the ECU to enter closed-loop fuel control sooner and reduce cold-start emissions.
• As an upstream (pre-catalyst / front) regulating sensor, it is installed before the catalytic converter and serves as the primary regulating probe that directly influences the ECU's fuel trim adjustments.
• The sensor features a 4-pin rectangular connector and a heated element.
• Cable length variations: Documented cable lengths for this OE number include 650 mm (HELLA / ANTEROS catalogue) and 415 mm (alternative aftermarket reference). Always measure your original sensor's cable length before ordering.
• The threads are M18 × 1.5, compatible with a standard 22 mm (7/8″) oxygen sensor socket.
• Also known as: O2 Sensor, Lambda Sensor, Front Oxygen Sensor, Pre-Catalyst Sensor, Exhaust Gas Sensor.

The following OE numbers are directly interchangeable or closely related to 89465-12640. These references are frequently grouped together across multiple aftermarket catalogues.

• 89465-12630 is the rear (downstream / post-catalyst) oxygen sensor counterpart for many of the same Toyota Corolla applications. This part (89465-12640) is the front (upstream / pre-catalyst) sensor.
• 89465-12700 is another related downstream sensor reference for right-hand drive Corolla variants.
• The OE numbers 89465-02190 through 89465-58130 represent a broad family of Toyota oxygen sensors that share the same connector and thread specifications, with variations in cable length and calibration.
• Always physically compare your old sensor's connector shape (rectangular), pin count (4), cable length, and thread size (M18 × 1.5) before purchasing.

This Lambda Sensor is an original equipment component used across a range of Toyota and Lexus vehicles. Based on available cross-reference data, the sensor is installed in the upstream (pre-catalyst / front) position.

• This is an upstream (pre-catalyst / front) oxygen sensor. It is installed before the catalytic converter and serves as the primary regulating probe for air-fuel mixture control.
• Primary applications include Toyota Corolla Altis (ZZE121, LHD) from 2002 to 2004, Toyota Corolla with 1ZZ / 3ZZ engines from 2001 to 2007, Toyota RAV4 III (ZSA35) with 2.0L (3ZR-FAE) from 2008 to 2013, and Lexus LS 430 (UCF30) with 4.3L V8 (3UZ-FE) from 2000 to 2006.
• How to verify: Locate your vehicle's catalytic converter. The upstream sensor is typically installed in the exhaust manifold or in the pipe immediately before the catalytic converter. If your faulty sensor is located before the converter, this part is suitable.
• Not compatible with diesel engines — diesel applications use different sensors with different calibration parameters.
• The vehicle fitment information above is a guide only. Always confirm compatibility using your vehicle's VIN or by physically inspecting your old sensor's position, connector shape, and cable length before ordering.