Product Overview

The mass air flow sensor, OEM number 13621734657, is fitted to the BMW E30, E36, and E34, covering the 318i, 518i, and Z3, on the 1.8L engine. Since this sensor spans three classic BMW chassis codes sharing the same 1.8L engine, it's a useful part number for distributors serving BMW parts demand in markets where these older, well-established models remain common.

A worn or failing mass air flow sensor typically shows up as rough idle, hesitation or stalling, reduced fuel economy, or an illuminated check engine light. 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

13621734655, 0280202134, 0280202203

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

What Is a Mass Air Flow Sensor?

Function: The mass air flow sensor measures the volume and density of air entering the engine, sending this data to the engine control unit to calculate the correct amount of fuel to inject.

Working Principle: A heated element inside the sensor housing cools as air flows past it; the engine control unit measures the electrical current needed to maintain the element's temperature, which corresponds directly to the mass of air passing through.

Importance: On a 1.8L engine platform, an accurate mass air flow reading is essential for correct fuel delivery, smooth engine operation, and fuel efficiency.

Common Failures & Signs: Rough or unstable idle. Hesitation, stumbling, or stalling during acceleration. Reduced fuel economy from an incorrect air-fuel mixture. Illuminated check engine light with a mass air flow trouble code.

Key Features

OEM-standard fitment - matches factory mounting and electrical specification for the 13621734657 application.

Precision manufacturing - built to tight tolerance for accurate airflow measurement.

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 airflow measurement accuracy and smooth engine operation.

Benefits

Importers - covers mass air flow sensor demand across the E30, E36, and E34 from one part number.

Wholesalers - steady demand from classic BMW chassis still common on the road.

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

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

End Customers - restored smooth engine operation and fuel efficiency.

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 mass air flow sensors for the BMW E30, E36, or E34? Contact GSK Auto for a wholesale quote, catalog, or OEM/private label cooperation.