Bosch 13027 Oxygen Sensor - Upstream

Bosch Oxygen Sensor for Upstream Emissions Control

Bosch Engineered Oxygen Sensor Part Number 13027 is a specific-fit, narrow-band heated oxygen sensor for upstream exhaust monitoring. It delivers air-fuel-ratio feedback to the ECU for stable combustion control and lower emissions, with OE-level engineering for demanding daily driving and heavy-duty use.

Key Features

• Specific-fit Bosch oxygen sensor for direct application matching
• Narrow-band heated O2 sensor for faster closed-loop operation
• 4-wire design with included wiring harness and female connector
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing and high-temperature materials for harsh exhaust conditions
• Wiring harness length: 12.4 in; overall length: 16.1 in
• Standard replacement grade for upstream emissions service

Product Line Details

The Bosch Engineered Oxygen Sensor line builds on Bosch OE development dating back to the original thimble-style sensor and later planar narrowband designs. That engineering focus is reflected in quicker light-off, improved lambda accuracy, and faster transition into closed-loop control, which is important for vehicles that rely on precise upstream exhaust feedback.

Detailed Description

Bosch Part Number 13027 is built for upstream placement on compatible Chevrolet and GMC trucks and SUVs, including applications such as the Chevrolet Express 2500, Chevrolet Tahoe, GMC Savana 3500, and GMC Yukon. It uses a heated narrow-band sensing element to report oxygen content changes to the engine computer, helping maintain the correct air-fuel mixture during warm-up and normal operation. This Bosch oxygen sensor is a direct-fit replacement for vehicles that require a threaded, 4-wire, pin-terminal sensor with an oblong female connector.

This part cross-references GM OE numbers 19178934 and 19178942 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle or unstable fuel control from inaccurate upstream readings
• Excess fuel consumption caused by delayed or incorrect sensor feedback
• Failed emissions inspection tied to oxygen sensor faults
• Slow closed-loop response after cold start

Installation Notes and Fitment

Compatible With 1996-2002 Chevrolet Express 2500, upstream; 1996-2002 Chevrolet Express 3500, upstream; 1996-2002 GMC Savana 2500, upstream; 1996-2002 GMC Savana 3500, upstream; 1996-2000 Chevrolet Tahoe, upstream; 1996-2000 GMC Yukon, upstream; and other listed Chevrolet and GMC applications in the same upstream position. Fitment also includes 1996-1999 Chevrolet C1500, C1500 Suburban, C2500 Suburban, K1500, K1500 Suburban, K2500 Suburban, P30, and matching GMC C1500, C1500 Suburban, C2500 Suburban, K1500, K1500 Suburban, K2500 Suburban, and P3500 upstream applications.

Before installation, verify connector shape, wire count, thread size, and upstream location against the original sensor. Use the correct oxygen sensor socket and inspect the exhaust bung threads for damage or contamination before threading in the replacement.

Quality Assurance

Bosch draws on more than five decades of OE oxygen sensor development, and this Bosch Engineered Oxygen Sensor is built with ceramic sensing elements, controlled heater operation, and heat-resistant materials for consistent performance under thermal and vibration load.