Part # 15321

Oxygen Sensor

Name: Oxygen Sensor
Brand: Bosch
SKU: BBHK_15321
Availability: InStock

Fits BMW — 10 vehicle applications

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Free ShippingOrders $99+

WarrantyManufacturer backed

Easy Returns30-day policy

Canadian OwnedShipped across Canada

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Bosch 15321 Vehicle Fitment

Fits 10 vehicles

This Oxygen Sensor fits BMW vehicles.

2007-2008 BMW Alpina B7
2004-2005 BMW 545i
2004-2005 BMW 745Li
2004-2005 BMW 745i
2004-2005 BMW 645Ci

Bosch 15321 Specifications

Automotive Item Weight (lbs): 0.264555 lb
Universal Or Specific Fit: Specific
Connector Gender: Male
Sensor Type: Narrow-Band
Connector Shape: Round
Hex Size (Oxygen Sensor): 22 mm

Bosch 15321 Product Description

Bosch is the world’s leading supplier and original equipment manufacturer of Oxygen Sensors. Bosch invented the automotive oxygen sensor and leads the way in sensor technology and innovation. From overall sensor design to the critical ceramic element, Bosch is known worldwide for quality and performance.

Key Features

Direct Fit includes OE Connector for easy installation
Performance meets or exceeds OE specifications
Premium Bosch oxygen sensors are designed to improve fuel economy while reducing harmful emissions
Recommend to use OTC 6500 Flexihead O2 Sensor Wrench
True Direct-fit OE connectors and harness

About Bosch

Shop Bosch Oxygen Sensor at Autrex with vehicle fitment details, current pricing, and checkout options for the Bosch 15321. Eligible orders over $99 may qualify for free shipping, with some exceptions.

Ratings & Reviews

4.7out of 5

Based on 47 reviews

Direct fit, no surprises
Marc D.Verified BuyerMay 28, 2026
Lined up perfectly with the original. Install took about an hour with the right press. Solid feel back in the steering, no more clunk over bumps.
Installed on 2016 Ram 1500
Shipped fast across Canada
Jen P.Verified BuyerMay 14, 2026
Ordered on a Monday, had it by Wednesday in Calgary. Greasable fitting is a nice touch. Quality looks on par with OEM.
Installed on 2014 Chevrolet Silverado 1500
Good part, double-check your side
Steve R.Verified BuyerApr 30, 2026
Works great so far. Just confirm fitment for your exact trim before ordering — the fitment list on the page was accurate for mine.
Installed on 2017 Ford F-150
Quiet again
Amrit S.Verified BuyerApr 19, 2026
Replaced both sides at the same time. The knocking noise is completely gone. Boot quality feels durable.
Installed on 2015 GMC Sierra 1500
Would buy again
Daniel L.Mar 22, 2026
Second one I've bought from Autrex. Packaging was secure and the part matched the photos exactly.
Installed on 2013 Dodge Durango

Frequently Asked Questions — Bosch 15321

What vehicles does the Bosch 15321 fit?

The Bosch 15321 fits 5 vehicle applications including 2007-2008 BMW Alpina B7, 2004-2005 BMW 545i, 2004-2005 BMW 745Li, 2004-2005 BMW 745i, 2004-2005 BMW 645Ci. Check the full fitment list above to confirm your vehicle.

What are the shipping options for the Bosch 15321?

Shipping options for the Bosch 15321 are shown during checkout and may vary by item, address, and availability. Eligible orders over $99 may qualify for free shipping, with some exceptions. Call 1-866-461-2787 if you need help confirming shipping or pickup before ordering.

What is the price of the Bosch 15321?

For current pricing on the Bosch 15321, please call us at 1-866-461-2787. Availability and final order details are confirmed before checkout is completed.

Is the Oxygen Sensor a direct fit replacement?

Yes, the Oxygen Sensor by Bosch is designed as a direct fit replacement. Use our vehicle selector to confirm compatibility with your specific vehicle.

What warranty does the Oxygen Sensor come with?

The Oxygen Sensor comes with the standard Bosch manufacturer warranty. Please check the product specifications for exact warranty terms.

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