Bosch 15681 oxygen sensor for the 2003-2006 BMW 325Ci 6-cylinder 2.5L and other vehicles sends air-fuel-ratio measurements to the ECU. It is a switching-type, narrow-band sensor for the downstream position.
A failing oxygen sensor can show up as a check engine light, rough running or poorer fuel economy, and a wiring fault can look much the same. Before replacing it, look over the sensor wiring and connector for damage with the engine off and cool.
This downstream oxygen sensor fits the 2003-2006 BMW 325Ci 6-cylinder 2.5L, the 2003-2006 BMW 330Ci 6-cylinder 3.0L and the 2004-2006 BMW X3 6-cylinder 3.0L, among other vehicles. This listing is a single sensor, and the 2004-2006 BMW X3 6-cylinder 3.0L takes one.
Fit and size
Build and materials
One oxygen sensor with its wiring harness. A mounting bracket is not included.
Is this the right oxygen sensor for a 2004-2006 BMW X3 6-cylinder 3.0L?
Yes. Bosch 15681 is listed for the 2004-2006 BMW X3 6-cylinder 3.0L, which takes one. If your car is not named here, open the Buyer's Guide tab and enter your year, make and model.
Is this Bosch O2 sensor heated?
Yes. Bosch 15681 is a narrow-band heated sensor with an integrated heater element, and it reaches operating temperature in under 10 seconds.
Does this downstream oxygen sensor come with a wiring harness?
Yes, the wiring harness is included with the sensor. A mounting bracket is not included.
What are the thread and hex sizes of this Bosch premium oxygen sensor?
The thread size is M18 - 1.5 and the hex size is 22 mm. Length from the sealing surface to the end of the connector is 38.4 in.
Does this oxygen sensor come with anti-seize on the threads?
Yes. Conductive anti-seize is already applied to the threads, and the direct-fit connector is made for quick installation.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
