Product Overview

The oxygen sensor, OEM number 11787589121, is an upstream (pre-catalytic converter) sensor fitted across BMW's N20/N26 2.0L turbocharged 4-cylinder engine platform, including the F22/F23 2 Series (228i, 230i), F30/F31/F34 3 Series (320i, 328i, 330i, 330e), F32/F33/F36 4 Series (428i, 430i), F25 X3, F26 X4, X1, and E89 Z4, covering the 2011-2018 production run. Since this sensor spans nearly all of BMW's core 4-cylinder turbo platforms from this generation, it's a high-turnover part number worth stocking in significant volume for distributors serving BMW emissions parts demand.

A worn or failing oxygen sensor typically shows up as an illuminated check engine light, reduced fuel economy, rough idle, or increased exhaust emissions. GSK Auto manufactures this sensor to OEM specification at our Ningbo, China facility, with every unit tested before packing. We supply at wholesale volume with low MOQ and support private label packaging, with our team available to confirm fitment before shipping.

Replacement OEM Numbers

Cross-Reference OEM Number Bosch

17272, 077212182626, 4047025002165, 0258027029

(Confirm against your VIN or chassis code and sensor position before ordering — these are commonly listed cross-references for this application, not a guarantee of exact fitment for every variant.)

What Is an Oxygen Sensor?

Function: The upstream oxygen sensor, positioned before the catalytic converter, measures the oxygen content in the exhaust stream, sending this data to the engine control module to fine-tune the air-fuel mixture for optimal combustion.

Working Principle: A heated ceramic element inside the sensor generates a voltage signal proportional to the oxygen level in the exhaust, allowing the engine control module to adjust fuel delivery in real time to maintain the correct air-fuel ratio.

Importance: On BMW's widely used N20/N26 turbocharged 4-cylinder platform, a properly functioning upstream oxygen sensor is essential for engine efficiency, fuel economy, and keeping emissions within acceptable limits.

Common Failures & Signs: Illuminated check engine light with an oxygen sensor trouble code. Reduced fuel economy from an incorrect air-fuel mixture. Rough idle or hesitation during acceleration. Increased exhaust emissions or failed emissions testing.

Key Features

OEM-standard fitment - matches factory mounting and electrical specification for the 11787589121 application, upstream/pre-catalytic converter position.

Precision manufacturing - built to tight tolerance for accurate signal output.

Long service life - built to handle sustained daily-driving load.

Excellent fitment - direct plug-in replacement, no modification required.

Tested before shipment - every unit checked for proper signal output before packing.

Reliable performance - restores factory air-fuel mixture control and fuel efficiency.

Benefits

Importers - covers upstream oxygen sensor demand across BMW's core 4-cylinder turbo platforms from one part number.

Wholesalers - very high turnover given the breadth of vehicles using this sensor.

Repair Shops - tested unit reduces comeback risk on a common emissions repair.

Distributors - private label packaging available for building a branded catalog.

End Customers - restored fuel efficiency and reduced emissions.

Packaging & Shipping

Standard export cartons. Customized packaging available for distributor branding. OEM-style and private label printing on request. Container loading handled directly, with mixed-SKU consolidation for smaller orders. Worldwide shipping to Europe, North America, South America, the Middle East, Africa, and Southeast Asia.

Why Choose GSK Auto

GSK Auto manufactures factory-direct, keeping pricing tied to production cost. This sensor is built to OEM specification and tested before packing. We support low MOQ, private label packaging, and worldwide shipping, with our technical team available to confirm fitment before you order.

Call to Action

Sourcing upstream oxygen sensors for BMW's 2, 3, 4 Series, X1, X3, X4, or Z4? Contact GSK Auto for a wholesale quote, catalog, or OEM/private label cooperation.