Bosch 15294 Oxygen Sensor - Downstream

Bosch Validated Oxygen Sensor for Downstream Control

Bosch Validated Oxygen Sensor 15294 is a narrow-band heated O2 sensor built for precise air-fuel-ratio feedback to the ECU. It supports stable combustion control and emissions management in downstream applications, including Suzuki Grand Vitara, Suzuki SX4, Chevrolet Tracker, and Suzuki Vitara fitments.

Key Features

• Specific-fit, threaded oxygen sensor for direct application matching
• Narrow-band heated design for faster closed-loop operation
• Square connector with 4 terminals and 4-wire harness
• Blade terminal type with male connector and male terminal gender
• 22 mm hex size and 18 mm thread diameter
• Steel finish with metal housing for high-temperature service
• Wiring harness included with 21.3 in harness length
• Overall length: 25 in; sealing surface to connector end: 23.8 in

Product Details

Part number 15294 uses Bosch’s validated oxygen sensor design to deliver accurate lambda feedback under changing load and temperature conditions. Bosch developed its oxygen sensor technology from early thimble-style designs to planar narrowband construction, improving light-off response, closed-loop readiness, and measurement accuracy. This Bosch Validated Oxygen Sensor line reflects more than five decades of OE development and brings that experience to aftermarket replacement needs. This part cross-references 1821365J12 and 1821367D50 for the same application.

Vehicle Fitment

• Fits 2009-2013 Suzuki Grand Vitara, Downstream
• Fits 2001-2005 Suzuki Grand Vitara, Downstream
• Fits 2007 Suzuki SX4, Downstream
• Fits 2001-2004 Chevrolet Tracker, Downstream
• Fits 2004 Suzuki Vitara, Downstream

What It Helps Address

• Faulty downstream oxygen sensor readings
• Check engine lights related to O2 sensor performance
• Unstable air-fuel ratio feedback to the ECU
• Delayed closed-loop operation after startup
• Emissions test failures caused by sensor degradation

Installation Notes

Verify the connector shape, wire count, thread size, and downstream location before installation. Use the 18 mm thread diameter and 22 mm hex size to confirm tool fitment, and compare the harness length and connector orientation to the original sensor on the vehicle. For Suzuki Grand Vitara, Suzuki SX4, Chevrolet Tracker, and Suzuki Vitara applications, confirm the downstream mounting point matches the removed sensor.

Quality Assurance

Bosch backs this oxygen sensor with OE development experience and validated aftermarket coverage. The sensor uses high-temperature-resistant materials, optimized heater control, and ceramic sensing elements to maintain consistent performance in demanding thermal and vibration conditions.