Bosch 13474 Oxygen Sensor - Downstream, Downstream Right or Upstream

Bosch Oxygen Sensor for OE-Style Emissions Control

Bosch Part Number 13474 is a specific-fit, narrow-band heated oxygen sensor built for stable air-fuel ratio feedback to the ECU. It supports closed-loop fuel control on a wide range of GM applications, including Buick LeSabre, Chevrolet Impala, and GMC Sierra 1500 fitments.

Key Features

• Specific-fit Bosch Engineered Oxygen Sensor for direct application matching
• Narrow-band heated O2 sensor for faster light-off and quicker closed-loop operation
• 4-wire design with square male connector and blade terminals
• Threaded mounting with 18 mm thread size and 22 mm hex size
• Wiring harness included with 12.7 in harness length
• Steel finish with metal housing for high-temperature and vibration resistance
• Bosch Part Number 13474 for easy catalog and cross-reference lookup

Product Details

Bosch Engineered Oxygen Sensor 13474 uses advanced ceramic sensing elements and optimized heater control to deliver accurate switching-type oxygen readings under changing exhaust conditions. Bosch developed this sensor line from its OE oxygen sensor experience, moving from early thimble-style designs to planar narrowband technology that improves response time and lambda accuracy. This makes it a practical replacement for upstream and downstream sensor locations across many GM vehicles from 1990 through 2003. This part cross-references GM OE numbers 19178945 and 25163080 for the same application.

What It Helps Solve

• Check engine lights related to oxygen sensor performance
• Rich or lean fuel trim conditions caused by inaccurate exhaust feedback
• Slow sensor response that delays closed-loop fuel control
• Reduced emissions performance from a worn upstream or downstream sensor
• Driveability issues tied to unstable air-fuel ratio correction

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for upstream, downstream, and downstream right locations depending on the vehicle. Confirm the 4-wire connector, threaded mount, 18 mm thread size, and harness length against the original sensor before installation. For best results, inspect the exhaust threads and connector condition before replacing the sensor on applications such as Chevrolet Camaro, Pontiac Grand Prix, or GMC Yukon.

Quality Assurance

Bosch backs this oxygen sensor with more than five decades of OE development and aftermarket supply experience. The design uses durable materials, heater control, and sensor construction intended to maintain consistent performance in demanding thermal and vibration environments.