NTK 24689 Oxygen Sensor - Downstream

Direct Fit Oxygen Sensor for Toyota Sienna

NTK 24689 is a direct fit heated oxygen sensor built for specific applications, including 2001-2003 Toyota Sienna downstream placement. It uses a 4-wire design, 18 mm thread diameter, and an 11.75 in. wiring harness length to match the original equipment layout.

As part of the NTK Direct Fit Oxygen Sensor line, this sensor focuses on OE-style fit, form, and function for import and domestic vehicles. NTK applies ceramic manufacturing expertise and extensive production testing to support consistent signal performance and reliable emissions-system operation.

Key Features

• Direct fit, specific application oxygen sensor
• Heated sensor design for faster operating temperature
• 4-wire configuration
• 11.7500 in. wiring harness length
• 18.000 mm thread diameter
• Flange mounting type
• Fits 2001-2003 Toyota Sienna, downstream

Detailed Description

NTK 24689 is engineered for the downstream oxygen sensor location on 2001-2003 Toyota Sienna models. If you are replacing a worn downstream sensor on a Toyota Sienna, this direct fit part is built to match the original sensor layout and electrical configuration without requiring a universal adaptation. This part cross-references Bosch 13566 for the same application.

NTK’s Direct Fit Oxygen Sensor line is backed by the company’s role as a major OE oxygen sensor manufacturer. The brand’s manufacturing process emphasizes ceramic control from raw material through finished sensor, helping maintain consistent quality for emissions monitoring and fuel-control feedback.

Common Problems This Part Can Address

• Check engine light related to downstream oxygen sensor performance
• Slow or inaccurate oxygen sensor response
• Emissions test failure tied to sensor degradation
• Incorrect air-fuel feedback from a failing sensor circuit
• Corrosion or wiring damage at the original sensor location

Installation Notes and Tips

Confirm the downstream position before ordering, since NTK 24689 is specific to the listed Toyota Sienna applications. Verify the 4-wire connector, 18 mm thread size, and flange mounting style against the original sensor before installation. Use proper oxygen sensor service procedures to avoid damaging the harness or sensor body during removal and replacement.

Quality Assurance

NTK tests oxygen sensors during manufacturing to help ensure quality and reliability that meet or exceed OE specifications. The Direct Fit Oxygen Sensor line is supported by NTK’s OE application expertise and broad coverage for import and domestic vehicles.