Bosch 13658 Oxygen Sensor - Upstream Left

Bosch Actual OE Oxygen Sensor for Infiniti Q45

Bosch 13658 is a specific-fit, narrow-band heated oxygen sensor built for precise air-fuel-ratio feedback to the ECU. It fits 1998-2001 INFINITI Q45, Upstream Left, and supports stable closed-loop fuel control across changing engine conditions.

Key Features

• Fits 1998-2001 INFINITI Q45, Upstream Left
• Bosch Actual OE Oxygen Sensor line for OE-style replacement fit and function
• Narrow-band heated O2 sensor for faster light-off and quicker closed-loop operation
• 3-wire design with included wiring harness and oblong male connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing and high-temperature-resistant construction for demanding exhaust conditions
• Part number 13658 for direct catalog lookup

Detailed Description

Bosch 13658 is a switching-type oxygen sensor engineered to measure exhaust oxygen content and send accurate feedback to the engine control unit. In the Bosch Actual OE Oxygen Sensor line, this sensor reflects Bosch’s long OE development history, including narrowband planar sensor design improvements that support faster response, improved lambda accuracy, and stable operation under heat and vibration. For drivers searching for a 1998-2001 INFINITI Q45 upstream left oxygen sensor, Bosch 13658 provides the correct specific-fit replacement format.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Check engine light caused by oxygen sensor signal faults
• Rich or lean fuel mixture readings at the ECU
• Slow sensor response during closed-loop operation
• Reduced emissions performance from a worn upstream sensor
• Rough combustion control related to inaccurate air-fuel feedback

Installation Notes and Tips

Confirm the upstream left location before installation and match the 3-wire, threaded, narrow-band configuration to the original sensor. Use the 18 mm thread size and 22 mm hex specification to verify tool fitment, and route the included harness away from exhaust heat and moving components. Bosch 13658 is a direct-fit replacement for the listed application, so connector shape, terminal style, and harness length should be checked against the original part before installation.

Quality Assurance

Bosch supplies this oxygen sensor as part of its Actual OE Oxygen Sensor line, drawing on more than five decades of OE sensor development and aftermarket supply. The design uses ceramic sensing elements, controlled heater operation, and heat-resistant materials to maintain consistent signal quality in harsh exhaust environments.