Bosch 12102 Oxygen Sensor - Upstream

Bosch Oxygen Sensor for Toyota and Geo Applications

Bosch Engineered Oxygen Sensor 12102 is a specific-fit, narrow-band non-heated upstream oxygen sensor built for precise air-fuel ratio feedback to the ECU. It supports stable combustion control and emissions management in select Toyota Camry, Celica, Corolla, and Geo Prizm applications.

• Specific-fit Bosch oxygen sensor for upstream placement
• Narrow-band, non-heated sensor type
• Blade terminal with round connector and male terminals
• Wiring harness included for direct replacement use
• Standard replacement grade for emission control service
• Metal housing with flange mounting and 18 mm thread diameter
• 22 mm hex size for service access

Bosch Engineered Oxygen Sensor Line

The Bosch Engineered Oxygen Sensor line draws on Bosch OE development dating back to the original thimble sensor introduced in 1976 and later planar narrowband designs. This product line focuses on accurate lambda measurement, faster sensor response, and reliable closed-loop operation using ceramic sensing elements, controlled heating strategies where applicable, and high-temperature-resistant materials.

Detailed Product Overview

Bosch 12102 is an upstream narrow-band oxygen sensor for emission control systems that rely on accurate exhaust feedback. It is listed for 1992-1995 Toyota Camry upstream, 1992-1995 Toyota Celica upstream, 1993-1995 Toyota Corolla upstream, and 1993-1995 Geo Prizm upstream, including California-emissions and non-California configurations where noted. This part cross-references Bosch-style OE applications such as 94854939 and 8946519545 for the same application.

What This Oxygen Sensor Helps Address

• Rich or lean air-fuel mixture readings at the ECU
• Check engine light conditions tied to oxygen sensor performance
• Unstable idle or drivability issues related to exhaust feedback
• Emissions test failures caused by inaccurate lambda sensing
• Delayed closed-loop fuel control on upstream sensor circuits

Installation Notes and Tips

Verify the connector shape, terminal style, thread diameter, and upstream location before installation. This Bosch 12102 uses a 18 mm thread, 22 mm hex, and a round male connector with blade terminals. Confirm vehicle-specific fitment for the exact Toyota Camry, Celica, Corolla, or Geo Prizm application and match California-emissions notes where applicable.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development in emission control sensing. The design uses durable materials and Bosch-engineered sensor technology intended to maintain accurate signal output under thermal and vibration stress.