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  • BMW Secondary Air Injection Mass Air Flow Sensor - VDO 11721438814
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BMW Secondary Air Injection Mass Air Flow Sensor - VDO 11721438814
BMW Secondary Air Injection Mass Air Flow Sensor - VDO 11721438814
BMW Secondary Air Injection Mass Air Flow Sensor - VDO 11721438814
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BMW Secondary Air Injection Mass Air Flow Sensor - VDO 11721438814

MPN: 11721438814

VDO
VDO-5WK9639Z
In stock
$199.00 CAD $159.00 CAD

In Stock

Estimated Delivery: Aug 27, 2025 - Sep 02, 2025

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BMW Secondary Air Injection Mass Air Flow Sensor - VDO 11721438814
Product Product subtotal Quantity Price Product subtotal
BMW Secondary Air Injection Mass Air Flow Sensor - VDO 11721438814
BMW Secondary Air Injection Mass Air Flow Sensor - VDO 11721438814VDO-5WK9639Z
BMW Secondary Air Injection Mass Air Flow Sensor - VDO 11721438814VDO-5WK9639Z
$199.00
$159.00/ea
 $0.00
$199.00
$159.00/ea
 $0.00
Description

Details

SKU: VDO-5WK9639Z
GTIN / UPC: 4103590942135
Made in: Germany
Quality: OE

OE Numbers

11721438814

MFG Numbers

5WK9639Z

Product Information

This OE VDO mass air flow (MAF) sensor is specifically designed to monitor the airflow through your BMW’s secondary air injection system. It uses a hot film sensing element to detect the volume of air passing through the system and communicates this data to the ECU to ensure proper emissions control during cold starts. This supports the catalytic converter’s efficiency by injecting fresh air into the exhaust system for a cleaner burn.

Over time, secondary air MAF sensors can degrade due to heat and particulate buildup, resulting in emissions-related fault codes or reduced system effectiveness. Replacing a failing sensor helps maintain emissions compliance and smooth cold-start operation.

Mass Air Flow Sensor
This sensor is essential for accurate monitoring of the secondary air system and ensuring the vehicle meets cold-start emissions requirements. VDO’s hot film technology offers durability, precision, and self-cleaning performance tailored to BMW specifications.

Failure Symptoms:

  • Check engine light: Emissions-related codes tied to the secondary air injection system.
  • Failed emissions test: Improper air/fuel adjustment during warm-up can increase pollutants.
  • Cold-start hesitation: Reduced effectiveness of the secondary air system can affect idle stability during initial startup.

About VDO

VDO is a brand of Continental, with over 80 years of experience as an OEM supplier in the automotive industry. They produce precision parts like sensors, instrument clusters, control units, actuators, and infotainment systems—trusted by vehicle manufacturers worldwide.

VDO also offers high-quality aftermarket solutions built to OEM standards, backed by ISO 9001:2008 certification. As part of Continental’s Vehicle Networking and Information division, VDO supports both passenger and commercial vehicles with cutting-edge technology and reliable performance.

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At GEMS autocraft, we offer high-quality auto parts, performance upgrades, and accessories. We also specialize in professional maintenance services, BMW retrofits, and advanced coding solutions—all available at our Longueuil, QC location.

Returns are accepted within 30 days if the item is unused and in original packaging. For full details, see our Return Policy.

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GEMS autocraft Return & Warranty Policy

We are committed to customer satisfaction and offer a clear and efficient process for returns and warranty claims.

⟶ Returns
Return Window: Returns must be requested within 30 days of delivery.
Item Condition: Items must be unused, in original packaging, and in resellable condition.
Non-Returnable Items: Electrical components, fluids, lubricants, used parts, custom orders, and gift cards are final sale.
⟶ Warranty
Warranty Coverage: Most products and services are backed by a 1-year manufacturer or workmanship warranty. Eligibility may vary.
Claim Requirements: To submit a claim, provide the order number, product details, and a description of the issue. Supporting photos may be requested.
⟶ Additional Details
Refund Processing: Once inspected, refunds are issued within 3–5 business days to the original payment method.
Shipping Responsibility: Return shipping is the customer’s responsibility. Prepaid labels are available upon request.
Policy Details: View our complete Return and Warranty Policy for full conditions and examples.

Submit Return Request Submit Warranty Claim

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We stand behind the quality of every product we offer. All manufacturer warranties are honored according to their policies, with most components covered for 1-5 years. All GEMS autocraft branded products are backed by a lifetime warranty.

Standard shipping fees may apply.

For customers choosing installation at GEMS autocraft, we take it a step further—both the replacement part and installation are covered at no charge during the warranty period.

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