Bosch 13647 Oxygen Sensor - Upstream

Bosch Validated Oxygen Sensor for Lexus IS300

Bosch 13647 is a specific-fit, narrow-band heated oxygen sensor for the upstream position on 2001-2005 Lexus IS300 models. It provides air-fuel-ratio feedback to the ECU for stable closed-loop control and emissions monitoring.

The Bosch Validated Oxygen Sensor line builds on Bosch OE oxygen sensor development, including early thimble-style designs and later planar narrowband technology. Bosch 13647 uses a heated sensing element, ceramic construction, and high-temperature materials to deliver consistent signal response under demanding exhaust heat and vibration.

Key Features

• Fits 2001-2005 Lexus IS300, upstream
• Specific-fit Bosch oxygen sensor for direct application matching
• Narrow-band heated oxygen sensor type
• 4-wire design with rectangular male connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Wiring harness included for installation on the listed application
• Standard replacement grade for emission control service
• Bosch 13647 part number for catalog and service lookup

Detailed Description

Bosch 13647 is engineered for the upstream exhaust location on Lexus IS300 models from 2001 through 2005, including cylinder 4, 5, and 6 applications noted in the fitment data. As a narrow-band heated oxygen sensor, it reports exhaust oxygen content to the engine control unit so the fuel system can maintain the correct air-fuel ratio during warm-up and normal operation. The Bosch Validated Oxygen Sensor line is backed by Bosch’s long OE development history, with sensor designs focused on fast light-off, accurate lambda measurement, and reliable closed-loop operation.

This part cross-references Toyota/Lexus 8946553150 for the same application. If you are searching for a Bosch 13647 oxygen sensor for Lexus IS300 upstream service, this part matches the listed vehicle and position data.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel mixture readings at the ECU
• Slow sensor response during closed-loop operation
• Emissions test failures tied to upstream sensor output
• Rough idle or drivability issues caused by inaccurate exhaust feedback

Installation Notes and Tips

Install Bosch 13647 in the upstream threaded location specified for the 2001-2005 Lexus IS300. Confirm connector shape, wire count, and harness routing before installation, and inspect the exhaust bung threads for damage or contamination. Because this is a heated narrow-band sensor, proper electrical connection and secure routing away from exhaust heat are important for reliable operation.

Quality Assurance

Bosch oxygen sensors are developed from Bosch OE sensor engineering and validated for aftermarket use with the same focus on signal accuracy, heater control, and durability under thermal load. Bosch 13647 is built as a standard replacement emission control sensor for the listed Lexus IS300 application.