Oxygen Sensor Upstream for BMW 535i 535xi 740i 740Li X6

Upgrade your BMW’s oxygen sensing with the IWOKPHD Oxygen Sensor Upstream, designed for a precise, reliable read of the exhaust stream to keep your engine running cleanly and efficiently. This upstream sensor helps the engine control unit (ECU) tune the air-fuel ratio in real time, delivering smoother idle, better throttle response, and improved fuel economy. With a robust upstream front probe arrangement and piezoelectric sensing technology, it delivers accurate signals that your BMW trusts for optimal combustion.

Key benefits include quick response to exhaust changes, stable idle during cold starts, and consistent performance across city and highway driving. This sensor is built for durability and longevity under normal driving conditions, helping protect your catalytic converter and reduce emissions. The unit is rigorously tested prior to shipment to ensure a secure fit and reliable operation once installed.

Discreet, practical design means a straightforward install with a stable fit. For peace of mind, this component is backed by a one-piece package and a warranty when used as intended.

At intercyprus.com since 2002 — trusted for quality and reliability.

Product specifications

• Brand Name: IWOKPHD
• Sensor Type: Piezoelectric
• Measuring Range / Application: Upstream Front Probe Air/Fuel Ratio (Lambda) O2 sensor
• OEM No. / Part Numbers: 234-5025, 2345025, 234 5025, 11787586692
• Origin: Mainland China
• Notes: Please check the product picture and fitment before you order. If you are not sure, contact us before ordering to avoid refunds for incorrect orders.

Package includes:

• 1 PCS

Fitment (selected models)

For BMW: 535i (2008-2011, L6 3.0L N54B30A Turbocharged Upstream Cyl 1-3), 535i xDrive (2009-2010, L6 3.0L N54B30A Turbocharged Upstream Cyl 1-3), 535xi (2008, L6 3.0L N54B30A Turbocharged Upstream Cyl 1-3), 740i (2011-2012, L6 3.0L Petrol Turbocharged Upstream Cyl 1-3), 740Li (2011-2012, L6 3.0L N54B30A Turbocharged Upstream Cyl 1-3), X6 (2008-2010, L6 3.0L Petrol Turbocharged Upstream Cyl 1-3), X6 (2008-2010, V8 4.4L Petrol Turbocharged Upstream Left).

Additionally listed in the package: For Mercedes-Benz CLK63 AMG (2007-2009, V8 6.3L, Upstream Left) and For Mercedes-Benz E320 (2005-2006, L6 3.2L, Upstream Downstream Left).

Warnings / reminders

Note: Please check the product picture, fitment before you order. If you are not sure, please feel free to contact us before you order it; otherwise we will not refund money for incorrect orders. Thanks a lot.

All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.

Warranty: 1 year | Warranty Type: Replacement

Shipping: All items are dispatched within 2 working days after payment is confirmed. Import duties, taxes, and charges are not included in the item price or shipping charges. These charges are buyer’s responsibility. If you have questions, please contact us before purchasing. Language support is available where indicated by product listings.