Bosch 13120 Oxygen Sensor - Upstream, Upstream Left or Upstream Right

Bosch Actual OE Oxygen Sensor 13120

Bosch 13120 is a narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management for specific Ferrari and Volvo applications, including Ferrari 348 and Volvo 850 upstream locations.

Key Features

• Actual OE Oxygen Sensor from Bosch
• Narrow-band heated O2 sensor for closed-loop fuel control
• Specific fit design with 4-wire harness and rectangular connectors
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with steel finish for underbody durability
• Wiring harness included; harness length 32.2 in
• Overall length 35.9 in; sealing surface to connector end 34.7 in

Product Details

Bosch Actual OE Oxygen Sensor 13120 uses a heated narrow-band sensing element and optimized heater control to deliver fast light-off and accurate lambda feedback across changing exhaust temperatures. Bosch has developed oxygen sensor technology since 1976, and this OE-focused design reflects that experience with ceramic sensing elements and high-temperature-resistant materials for consistent signal quality in demanding operating conditions. This part number 13120 is a direct-fit replacement for select Ferrari and Volvo models, including upstream applications on the Ferrari 348, Ferrari Mondial t, Ferrari 512 TR, and Volvo 850.

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

What It Helps Address

• Rich or lean air-fuel mixture readings from a worn upstream sensor
• Check engine light concerns related to oxygen sensor performance
• Slow closed-loop response during warm-up or driving transitions
• Unstable idle or drivability issues tied to inaccurate exhaust feedback
• Emissions test failures caused by degraded sensor output

Installation Notes

Compatible With 1990-1995 Ferrari 348, Ferrari Mondial t, Ferrari 512 TR, and 1993-1994 Volvo 850 upstream applications listed in the fitment data. Confirm the vehicle position, connector style, and 18 mm threaded mounting before installation. Use the existing harness routing and verify the sensor is installed in the correct upstream location for the application.

• Fits 1993-1995 Ferrari 348 Spider, upstream
• Fits 1993-1994 Ferrari 348 GTB, upstream
• Fits 1993-1994 Ferrari 348 GTS, upstream
• Fits 1992-1994 Ferrari 512 TR, upstream
• Fits 1994 Volvo 850, upstream, without Air Pump; To Chassis # 70018
• Fits 1991-1993 Ferrari Mondial t, upstream
• Fits 1993 Volvo 850, upstream, without Air Pump
• Fits 1991-1992 Ferrari 348 TB, upstream
• Fits 1991 Ferrari 348 TS, upstream
• Fits 1990 Ferrari 348 TB, upstream left and upstream right, with 4 Wire Leads
• Fits 1990 Ferrari 348 TS, upstream left and upstream right, with 4 Wire Leads
• Fits 1990 Ferrari Mondial t, upstream left and upstream right, with 4 Wire Leads

Quality Assurance

Bosch supplies this oxygen sensor as an OE-proven replacement backed by more than five decades of oxygen sensor development. The design is built to maintain accurate signal output, heater performance, and durability under thermal and vibration load.