Bosch 13035 Oxygen Sensor - Downstream

Bosch 13035 Oxygen Sensor Overview

Bosch 13035 is a specific-fit, narrow-band heated oxygen sensor built for downstream emission control applications. It provides the ECU with air-fuel-ratio feedback to support stable combustion control and lower exhaust emissions in the vehicles listed below.

As part of the Bosch Engineered Oxygen Sensor line, this sensor reflects Bosch’s long OE development history in oxygen sensing technology, including narrowband designs that improve closed-loop response and measurement accuracy under changing operating conditions.

Key Features

• Specific-fit Bosch oxygen sensor for downstream placement
• Narrow-band heated design for faster sensor activity after startup
• 4-wire configuration with square connector and blade terminals
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing and high-temperature materials for demanding exhaust environments
• Wiring harness included with a 22.6 in harness length
• Overall length: 26 in; sealing surface to connector end: 24.8 in

Detailed Description

Bosch part number 13035 is a standard replacement oxygen sensor engineered for downstream use in select Chevrolet Tracker, Suzuki Vitara, Suzuki Sidekick, Suzuki X-90, Geo Tracker, Pontiac Sunrunner, and Suzuki Esteem applications. It uses a heated narrow-band sensing element to deliver the signal the ECU needs for closed-loop fuel control after the catalyst, helping maintain consistent drivability and emissions performance.

This Bosch Engineered Oxygen Sensor line is built around Bosch’s OE-focused sensor development, using ceramic sensing elements, controlled heater operation, and durable construction to handle heat and vibration in the exhaust stream. If you are searching for a downstream oxygen sensor for a 1999-2001 Chevrolet Tracker, a 1996-1998 Suzuki Sidekick, or a 2002 Suzuki Esteem, Bosch 13035 is the direct-fit option for the listed configurations.

This part cross-references 1821358B41 and 30028571 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rich or lean fuel trim readings from a worn downstream sensor
• Slow sensor response after exhaust heat buildup
• Unstable closed-loop fuel control on listed vehicles
• Emissions test failures tied to sensor degradation

Installation Notes and Tips

• Confirm downstream location before ordering; this sensor is listed for downstream applications only.
• Verify connector shape, wire count, and thread size match the original sensor.
• Inspect the exhaust bung threads and clean corrosion before installation.
• Use proper oxygen sensor service tools to avoid damaging the hex or harness.
• Check for exhaust leaks or wiring damage that can affect sensor readings after replacement.

Quality Assurance

Bosch supplies oxygen sensors with OE development experience and application-specific engineering for aftermarket replacement. Bosch 13035 is built to the same general design standards used in Bosch’s narrow-band oxygen sensor program for accurate signal delivery and durable exhaust-system operation.