Bosch 15355 Oxygen Sensor - Upstream Left

Bosch OE Oxygen Sensor for Infiniti QX4

Bosch 15355 is an Actual OE Oxygen Sensor built as a standard replacement for precise air-fuel-ratio feedback to the ECU. It uses a narrow-band heated design with a threaded mounting style, round connector, and included wiring harness for direct service on the 2001 Infiniti QX4 upstream left position.

Key Features

• Fits 2001 Infiniti QX4, upstream left
• Bosch Actual OE Oxygen Sensor line for OE-style replacement performance
• Narrow-band heated oxygen sensor for closed-loop fuel control
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• 3-wire harness with round male connector and female terminals
• Metal housing with high-temperature-resistant construction
• Part number 15355 for catalog lookup and service matching

Product Details

Bosch 15355 is engineered for vehicles that rely on a switching-type O2 sensor to monitor exhaust oxygen content and send accurate feedback to the engine control unit. On the 2001 Infiniti QX4, upstream left placement makes this sensor part of the engine’s fuel-trim and emissions management strategy. Bosch’s Actual OE Oxygen Sensor line draws on decades of original equipment development, including narrowband planar sensor technology, optimized heater control, and ceramic sensing elements for stable operation under heat and vibration.

This Bosch 15355 oxygen sensor is a direct-fit, specific application part with a threaded mount, 27-inch overall length, and 23.3-inch wiring harness length. It is a practical choice for drivers searching for a 2001 Infiniti QX4 upstream left oxygen sensor, Bosch 15355 replacement, or an OE-style narrow-band heated O2 sensor for emissions service.

This part cross-references 226914W002 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to oxygen sensor performance
• Unstable air-fuel ratio feedback during closed-loop operation
• Inaccurate exhaust oxygen readings affecting fuel trim control
• Emissions test failure tied to a worn upstream O2 sensor
• Slow sensor response from heat cycling and age-related wear

Installation Notes and Tips

Verify the upstream left location before installation on the 2001 Infiniti QX4. Confirm the 18 mm thread size, 22 mm hex, and round connector style match the original sensor. Inspect the harness routing and connector condition before final assembly, and ensure the threaded mounting surface is clean to support proper sealing and signal accuracy.

Quality Assurance

Bosch backs this Actual OE Oxygen Sensor line with more than five decades of OE development and aftermarket application experience. The Bosch 15355 is built to OE-proven standards for accurate sensing, durable materials, and consistent operation in demanding thermal conditions.