Product Overview

The oxygen sensor, OEM number 11788631049, is a post-catalytic converter (downstream) sensor fitted across BMW's B46/B48 4-cylinder turbo platform and the N74 V12 engine, including the 230i, 330i/330e, 430i, 530i/530e, X3, and X4, covering the 2016-2021 production run, as well as the 750i, M760i, M550i, and Alpina B7 for the V12 application. Since this sensor spans BMW's core compact/mid-size 4-cylinder lineup as well as its V12 flagship models, 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, a catalyst efficiency trouble code, reduced fuel economy, 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

250-241213, 234-8013

(Confirm against your VIN or chassis code and sensor position (B1S2/B2S2, left/right) 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 downstream oxygen sensor monitors the efficiency of the catalytic converter, comparing exhaust oxygen levels before and after the converter to confirm it's functioning correctly.

Working Principle: The sensor generates a voltage signal based on the oxygen content in the exhaust stream after it has passed through the catalytic converter, allowing the engine control module to verify converter performance and detect efficiency loss.

Importance: On BMW's core 4-cylinder turbo and V12 platforms, a properly functioning downstream oxygen sensor is essential for confirming catalytic converter health and keeping emissions within acceptable limits.

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

Key Features

OEM-standard fitment - matches factory mounting and electrical specification for the 11788631049 application, downstream/post-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 catalytic converter monitoring and emissions accuracy.

Benefits

Importers - covers downstream oxygen sensor demand across BMW's 230i, 330i, 430i, 530i, 750i, X3, and X4 lineup 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 emissions accuracy and check engine light resolution.

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 downstream oxygen sensors for BMW's 230i, 330i, 430i, 530i, 750i, X3, or X4? Contact GSK Auto for a wholesale quote, catalog, or OEM/private label cooperation.