Bosch 17643 Oxygen Sensor - Upstream

Bosch Wideband O2 Sensor for Honda Civic

Bosch 17643 is an actual OE wideband oxygen sensor built for precise air-fuel ratio monitoring in modern engine management systems. It is a direct-fit, upstream sensor for 2017-2019 Honda Civic applications and uses a heated, threaded design with a wiring harness included for the specified vehicle fitment.

Key Features

• Wide-band sensor type for continuous air-fuel ratio measurement across the full lambda range
• Specific-fit design for 2017-2019 Honda Civic, upstream
• Heated oxygen sensor with optimized heater control for faster operating readiness
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Oblong connector with 4-wire harness and male terminals
• Robust metal housing for demanding exhaust temperatures
• Bosch part number 17643 for accurate catalog matching

Detailed Description

Bosch 17643 is part of the Bosch Actual OE Oxygen Sensor line, which focuses on OE-style replacement sensors built to match modern engine control requirements. This wideband A/F oxygen sensor provides detailed feedback to the ECU so the engine can maintain the correct air-fuel mixture during idle, acceleration, cruising, and load changes. For drivers and technicians servicing a Honda Civic, Bosch 17643 supports accurate upstream exhaust monitoring where precise mixture control matters most.

Bosch pioneered the wideband planar pump-cell sensor design used in many current engine management systems. That OE development background is reflected in the sensor’s fast light-off behavior, heated operation, and durable ceramic construction. If you are replacing a failing upstream sensor on a 2017-2019 Honda Civic, Bosch 17643 offers the correct fitment and sensor architecture for the application.

This part cross-references 36531RPYG01 for the same application.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle or inconsistent air-fuel control
• Reduced fuel economy caused by inaccurate exhaust feedback
• Driveability issues during acceleration or rapid load changes
• Emissions test failures tied to upstream sensor faults

Installation Notes and Tips

Fits 2017-2019 Honda Civic, upstream. Confirm the connector shape, wire count, and thread size before installation to match the original sensor. Because this is a threaded exhaust sensor, use the correct oxygen sensor socket and follow proper torque procedures during removal and installation. Inspect the harness routing and connector condition before final assembly to avoid heat damage or wiring strain.

Quality Assurance

Bosch has more than five decades of OE sensor development and supplies oxygen sensors to vehicle manufacturers as well as the aftermarket. Bosch 17643 is built to OE-proven standards for accurate signal response, stable heater performance, and long-term durability in demanding exhaust environments.