Bosch 13142 Oxygen Sensor - Downstream or Upstream

Bosch Oxygen Sensor 13142 Overview

Bosch Engineered Oxygen Sensor 13142 is a narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management across changing engine loads, making it a direct-fit replacement for select Toyota applications.

This Bosch Engineered Oxygen Sensor line draws on Bosch OE development dating back to the original oxygen sensor design and later planar narrowband technology. The result is a replacement sensor with fast light-off characteristics, accurate lambda feedback, and consistent operation in high-heat, high-vibration environments.

Key Features

• Specific-fit oxygen sensor for direct replacement service
• Narrow-band heated design for quicker closed-loop operation
• 4-wire configuration with blade terminals and rectangular connector
• Metal housing with flange mounting and steel finish
• 21.5 in wiring harness length and included wiring harness
• 22 mm hex size and 18 mm thread diameter
• Standard replacement grade for emission control repair

Detailed Product Description

Bosch part number 13142 is engineered as a switching-type oxygen sensor that reports exhaust oxygen content to the engine control unit so fuel delivery can be adjusted accurately. Its heated narrow-band design helps the sensor reach operating temperature faster, which supports earlier closed-loop control and more consistent drivability. For Toyota 4Runner, Toyota Previa, and Toyota T100 applications, this sensor matches the specified downstream or upstream positions listed in the fitment data.

Fits 1999-2000 Toyota 4Runner, downstream with California Emission System. Fits 1994-1997 Toyota Previa, upstream. Fits 1994 Toyota T100, downstream with California Emission System. Fits 1993-1994 Toyota T100, downstream. This part cross-references Bosch Engineered Oxygen Sensor 13142 for the same application.

What It Helps Address

• Check engine light concerns related to oxygen sensor performance
• Unstable air-fuel ratio feedback to the ECU
• Delayed closed-loop operation after startup
• Emissions control issues tied to aging upstream or downstream sensors
• Rough combustion control caused by inaccurate lambda readings

Installation Notes and Tips

Verify the connector shape, wire count, thread size, and sensor position before installation. This Bosch 13142 sensor uses a 4-wire heated narrow-band layout with a 18 mm thread and 22 mm hex, so matching the original configuration is important for proper fitment. Confirm whether your vehicle uses the upstream or downstream location shown in the fitment list, including California Emission System applications where noted.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in emission control sensing. The sensor uses advanced ceramic elements, optimized heater control, and high-temperature-resistant materials to support consistent performance under thermal and vibration stress.