Bosch 17037 Oxygen Sensor - Upstream

Bosch Wideband OE Oxygen Sensor

Bosch 17037 is a specific-fit wideband air-fuel oxygen sensor built for precise upstream fuel-trim control. It delivers continuous lambda measurement for accurate air-fuel ratio feedback, helping the engine computer manage combustion, emissions, and drivability on supported BMW applications.

Compatible with 2006 BMW 323i, 325i, 325xi, 330i, 330xi, 525i, 525xi, 530i, and 530xi in the upstream position, this Bosch Actual OE Oxygen Sensor is a direct replacement for vehicles that require a wideband sensor with a 5-wire harness and threaded mounting.

Key Features

• Wideband A/F oxygen sensor for continuous air-fuel ratio measurement
• Specific-fit design for select 2006 BMW upstream applications
• Heated sensor with optimized heater control for faster response
• 5-wire configuration with included wiring harness
• Blade terminals, oblong connector, and male connector/terminal design
• Threaded mounting with 18 mm thread diameter and 22 mm hex size
• Metal housing with robust ceramic sensor construction
• Overall length: 15.4 in; sealing surface to connector end: 14.2 in

Product Details

Bosch 17037 is part of the Bosch Actual OE Oxygen Sensor line, which focuses on OE-style replacement sensors built to match original equipment requirements. Bosch pioneered the wideband A/F oxygen sensor design used in modern engine management, and this sensor reflects that OE development with fast light-off, stable heater performance, and accurate feedback across the full lambda range. For BMW 323i, 325i, 325xi, 330i, 330xi, 525i, 525xi, 530i, and 530xi upstream service, Bosch 17037 provides the measurement precision needed for proper fuel control under changing load and temperature conditions.

This part cross-references BMW 11787537993 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to upstream oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn wideband sensor
• Rough idle or hesitation caused by inaccurate fuel-trim feedback
• Reduced fuel economy from poor mixture control
• Elevated emissions from delayed or unstable sensor response

Installation Notes

Verify the vehicle’s build date before ordering, since the listed BMW applications apply to specific production cutoffs. Confirm the upstream location, connector style, wire count, and thread size before installation. Because this is a wideband sensor, proper connector matching and secure threaded seating are important for accurate operation. Use the vehicle service information for torque and routing specifications.

Quality Assurance

Bosch supplies OE-developed oxygen sensor technology to the aftermarket, drawing on more than five decades of engine-management experience. Bosch 17037 is built as a standard replacement sensor with OE-proven design principles for consistent signal accuracy and durable operation.