NTK 25542 Oxygen Sensor - Downstream, Downstream Left or Downstream Right

Direct-Fit Oxygen Sensor for BMW Applications

NTK Oxygen Sensor 25542 is a specific-fit, heated oxygen sensor built for direct replacement service. It uses a threaded mounting design and a 4-wire configuration with a 21.75-inch harness for applications that require OE-style fit and function.

• Specific-fit oxygen sensor for direct replacement service
• Heated sensor design for faster operating response
• 4-wire configuration with 21.75-inch wiring harness
• Threaded mounting type with 18 mm thread diameter
• Engineered for OE-style fit, form, and function

Fitment and Application Details

Compatible with BMW 540i, BMW M5, BMW Z8, BMW 740i, BMW 740iL, BMW 750iL, BMW Z3, BMW 840Ci, and BMW 850Ci applications across the listed downstream positions. Fits 1995-2003 BMW 540i, downstream right and downstream left; 2000-2003 BMW M5, downstream right and downstream left; 2000-2003 BMW Z8, downstream right and downstream left; 1997-2001 BMW 740i, downstream right and downstream left; 1996-2001 BMW 740iL, downstream right and downstream left; 1998 BMW 750iL, downstream right and downstream left; 1996-1998 BMW Z3, downstream; 1995-1997 BMW 750iL, downstream right and downstream left; 1996-1997 BMW 840Ci, downstream right and downstream left; 1995-1997 BMW 850Ci, downstream right and downstream left.

This part cross-references Bosch 13475 and DENSO Auto Parts 234-4681 for the same application.

What This Sensor Helps Address

• Check engine light concerns related to oxygen sensor performance
• Incorrect air-fuel feedback from a worn downstream sensor
• Slow sensor response caused by age or contamination
• Fitment issues from using a universal sensor instead of a specific-fit part

Installation Notes and Quality

Use the listed BMW application and downstream position to confirm the correct sensor before installation. The threaded design and OE-style configuration support straightforward replacement on the specified vehicles. NTK tests these oxygen sensors during manufacturing to meet or exceed OE specifications, and the brand is known for original equipment oxygen sensor supply.