Bosch 13651 Oxygen Sensor - Downstream Left

Bosch Actual OE Oxygen Sensor 13651

Bosch 13651 is a specific-fit, narrow-band heated oxygen sensor built for downstream left placement on select Nissan and INFINITI applications. It delivers air-fuel-ratio feedback to the ECU for stable closed-loop control, accurate lambda monitoring, and lower emissions performance.

Key Features

• Actual OE Oxygen Sensor from Bosch’s OE-focused product line
• Narrow-band heated O2 sensor for precise switching-type signal output
• Specific fit with threaded mounting and square connector
• 4-wire design with included wiring harness
• Metal housing with high-temperature-resistant construction
• 22 mm hex size and 18 mm thread diameter

Product Details

Bosch 13651 uses advanced ceramic sensing elements and optimized heater control to support faster light-off and quicker closed-loop operation. Bosch’s long OE development history is reflected in this sensor’s stable signal behavior under heat and vibration, making it a direct replacement choice for vehicles that rely on accurate downstream oxygen sensor feedback. This part cross-references 226A14W011 for the same application.

Compatible With 2002-2003 INFINITI QX4, downstream left; 2001-2002 Nissan Pathfinder, downstream left; and 2001 INFINITI QX4, downstream left, late production. For shoppers searching for a 2002-2003 INFINITI QX4 downstream left oxygen sensor or a 2001-2002 Nissan Pathfinder downstream left O2 sensor, Bosch 13651 matches the listed OE-style application.

What It Helps Address

• Check engine light caused by a failing downstream oxygen sensor
• Incorrect air-fuel feedback affecting emissions monitoring
• Slow sensor response during closed-loop operation
• Rough combustion control from inaccurate lambda readings
• Sensor degradation from heat and vibration exposure

Installation Notes

Verify the downstream left location, connector shape, wire count, and thread size before installation. Use the existing threaded mounting point and confirm harness routing matches the original layout on the vehicle. This Bosch 13651 oxygen sensor is a direct-fit replacement for the listed Nissan Pathfinder and INFINITI QX4 applications.

Quality Assurance

Bosch backs this Actual OE Oxygen Sensor line with more than five decades of OE sensor development and manufacturing experience. The design follows OE-proven standards for signal accuracy, heater control, and durability in demanding exhaust conditions.