Bosch 12202 Oxygen Sensor - Upstream

Bosch Oxygen Sensor for Toyota and Geo

Bosch 12202 is a specific-fit, narrow-band oxygen sensor for select Toyota and Geo applications. It provides direct air-fuel-ratio feedback to the ECU for stable closed-loop fuel control and emissions monitoring.

Key Features

• Bosch Engineered Oxygen Sensor line with OE development heritage
• Narrow-band, non-heated oxygen sensor design
• Specific fit with rectangular male connector and 2 blade terminals
• Wiring harness included for the listed application
• Flange mounting with 18 mm thread diameter and 22 mm hex size
• Steel finish and metal housing for underhood durability
• Wiring harness length: 17.2 in; overall length: 20.9 in

Product Details

Bosch 12202 is built as a standard replacement oxygen sensor for upstream locations on select Toyota Corolla, Toyota Celica, and Geo Prizm models. As part of the Bosch Engineered Oxygen Sensor line, it reflects Bosch’s long OE development history in oxygen sensing, including narrow-band sensor technology that supports accurate lambda feedback and consistent combustion control. This Bosch 12202 sensor is a direct-fit solution for vehicles that require a non-heated upstream O2 sensor with the listed connector and mounting configuration.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel mixture feedback to the ECU
• Rough idle or unstable fuel control caused by sensor signal issues
• Failed emissions inspection tied to oxygen sensor faults
• Slow or inaccurate closed-loop operation on the listed vehicles

Installation Notes

Compatible With 1990-1993 Toyota Celica, upstream, with California Emission System; 1990-1992 Toyota Corolla, upstream; 1993 Toyota Corolla, upstream, without California Emission System; 1989-1990 Geo Prizm, upstream, from chassis # LZ090311; and 1991-1992 Geo Prizm, upstream. Verify connector shape, thread size, and mounting style before installation. Use the correct oxygen sensor socket and follow factory service procedures for wiring routing and torque specifications.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development experience and a product design focused on accurate signal output, heater-free simplicity, and durable operation in demanding thermal and vibration conditions.