BDFHYK Oxygen Sensor Upstream O2, Compatible with BMW 1 Series M 135i 335i 335i xDrive 335is 335xi 535i 535i xDrive 535xi X6 Z4 l6 3.0L, 17102, 11787558087, Replacement 1PCS

17102 BMW N54 Upstream O2 Sensor for 135i, 335i, 1 Series M, and Z4

This BDFHYK upstream O2 sensor is an OE-style aftermarket replacement for selected BMW N54 3.0L turbo applications that match 17102 or 11787558087. Verified fitment centers on 1 Series M, 135i, 335i/335xi/335i xDrive/335is, and Z4 sDrive35i/sDrive35is applications. The reference is used before the catalyst on the cylinders 4–6 side, so verify the original sensor number and exhaust location before ordering.

17102 BMW N54 O2 Sensor Vehicle Fitment

The older listing also named 535i and X6. Those applications are not included in this verified fitment set; confirm the VIN and original sensor number independently before using this SKU outside the rows above.

17102 BMW Upstream Oxygen Sensor Position and References

• Position: Pre-catalyst / upstream, cylinders 4–6 application
• Engine: 3.0L N54 L6 turbo gasoline
• References: 17102; 11787558087
• Package: 1 sensor

Diagnosing the 17102 BMW N54 O2 Sensor

A stored fault code or Check Engine Light does not prove that the upstream o2 sensor has failed. Inspect the connector, harness routing, heater power and ground where applicable, exhaust leaks, and related engine-running conditions before replacing parts. Confirm the sensor location from vehicle-specific service information because similar-looking sensors may be used in different positions.

How to know which O2 sensor is bad requires confirming the bank or cylinder group from the stored code, BMW service information, and live data. A harness fault, exhaust leak, mixture problem, or misfire can imitate a sensor failure.

Installing the 17102 BMW N54 Upstream O2 Sensor

• Allow the exhaust system to cool completely before removal.
• Compare the old and replacement sensors before installation, including the OE reference, connector, lead routing, and physical configuration.
• Use an O2 sensor socket or suitable wrench; avoid impact tools on the sensor.
• Start the sensor by hand to reduce the risk of cross-threading the exhaust bung.
• Use anti-seize only when permitted by the sensor instructions, and keep compounds away from the sensing element.
• Route the harness away from hot exhaust surfaces, sharp edges, and moving parts, then tighten to the vehicle-specific specification.