Bosch 12050 Oxygen Sensor - Downstream, Upstream, Upstream Left or Upstream Right

Bosch Oxygen Sensor for OE-Style Emissions Control

Bosch Engineered Oxygen Sensor 12050 is a narrow-band, non-heated upstream oxygen sensor built for specific vehicle applications. It delivers air-fuel-ratio feedback to the ECU for stable combustion control and emissions management in classic Honda, Acura, Suzuki, and Tracker applications.

Key Features

• Specific-fit Bosch oxygen sensor for direct application matching
• Narrow-band, non-heated sensor type with threaded mounting
• Round female connector with pin terminal design
• Wiring harness included for cleaner replacement routing
• Steel finish housing with metal construction for durability
• 18 mm thread diameter and 22 mm hex size
• 16.4 in wiring harness length and 20.1 in overall length

Product Line Details

The Bosch Engineered Oxygen Sensor line draws on Bosch OE development dating back to the original oxygen sensor design introduced in 1976. Bosch later refined the platform with planar narrowband technology for faster light-off, improved lambda accuracy, and quicker closed-loop operation. Part number 12050 reflects that OE-focused approach for vehicles that rely on precise upstream sensor input.

Detailed Description

Bosch 12050 is engineered for upstream sensor locations on applications such as Honda Civic, Honda Accord, Honda CRX, Honda Prelude, Acura Integra, Acura Legend, Suzuki Samurai, Suzuki Sidekick, and Tracker models. It is also listed for Chevrolet Tracker, Geo Tracker, and GMC Tracker applications. This part cross-references 36531PD2305 and 1821361A10 for the same application. Bosch 12050 uses a standard replacement design with a threaded mount, narrow-band sensing element, and a harnessed connector layout to match the original sensor interface on the vehicle.

What It Is Used For

• Restoring upstream oxygen sensor signal accuracy on Honda Civic and Honda Accord applications
• Addressing rich or lean fuel-control feedback caused by a worn sensor
• Supporting closed-loop fuel management after sensor aging or contamination
• Replacing a failed sensor on Acura Integra, Acura Legend, and Honda Prelude applications
• Correcting emissions-related drivability concerns tied to oxygen sensor response

Installation Notes and Tips

Verify the vehicle’s year, make, model, and sensor position before ordering. This Bosch Engineered Oxygen Sensor 12050 is listed for upstream locations, including upstream left and upstream right on select applications. Confirm the connector style, thread size, and harness routing against the original part before installation. Use proper oxygen sensor service tools and inspect the exhaust bung threads for damage before tightening.

Quality Assurance

Bosch supplies oxygen sensors with OE-based engineering and durable materials intended for demanding heat and vibration conditions. The Bosch Engineered Oxygen Sensor line is backed by more than five decades of oxygen sensor development and aftermarket support.