Denso 234-4155 Oxygen Sensor - Downstream or Upstream

Denso OE Style Oxygen Sensor 234-4155

Denso 234-4155 is a specific-fit heated oxygen sensor built to OE-style dimensions for direct replacement on select Toyota applications. It is engineered for accurate exhaust feedback, stable engine management, and consistent emissions-system performance.

Key Features

• Heated oxygen sensor for faster operating temperature and signal response
• Specific-fit design for exact replacement on listed Toyota vehicles
• 4-wire configuration
• 24.41 in. wiring harness length
• OE Style construction for factory-style fit and function
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Product Details

Denso’s OE Style sensor line is built and tested to OE standards, with precision manufacturing for first-time fit and reliable installation. This Denso oxygen sensor is designed for the Toyota 4Runner, Toyota Previa, and Toyota T100 applications listed below, including downstream and upstream positions where specified. The part number 234-4155 is also a useful cross-reference when replacing an original sensor on these vehicles.

This part cross-references Bosch 13142 for the same application.

Vehicle Fitment

• Fits 1999-2000 Toyota 4Runner, downstream. California exempt parts can be used on pollution controlled vehicles in California.; OE Style
• Fits 1994-1997 Toyota Previa, upstream. OE Style
• Fits 1993-1994 Toyota T100, downstream. California exempt parts can be used on pollution controlled vehicles in California.; OE Style

Common Issues This Sensor May Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel mixture readings from a worn sensor
• Reduced fuel economy caused by slow or inaccurate exhaust feedback
• Rough idle or drivability concerns tied to sensor degradation
• Emissions test failures caused by a faulty upstream or downstream sensor

Installation Notes

Verify the sensor position, connector style, and harness routing before installation. Because this is a specific-fit heated oxygen sensor, match it to the listed Toyota 4Runner, Previa, or T100 application and confirm the downstream or upstream location shown in the fitment data. Inspect the exhaust threads and wiring path during replacement to help ensure proper sensor operation.

Quality Assurance

Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards. The design includes a protective aluminum oxide trap layer to help shield the sensing element from contamination and support long-term performance.