Denso 234-4186 Oxygen Sensor - Downstream or Upstream

Denso OE Style Oxygen Sensor for Porsche Boxster

The Denso 234-4186 is an OE Style heated oxygen sensor built for specific-fit replacement on select Porsche Boxster applications. It is engineered to match factory-style fitment and signal performance for 1997-2002 Porsche Boxster upstream and downstream locations, including downstream secondary catalyst applications.

Denso’s OE Style line focuses on exact replacement dimensions and first-time fit. This oxygen sensor uses a threaded mounting design, a female connector, 4-wire configuration, and a 9.84-inch wiring harness length to support direct replacement on the correct Porsche Boxster exhaust position.

Key Features

• OE Style replacement oxygen sensor for select Porsche Boxster models
• Heated sensor design for faster operating response
• Specific fit application for direct replacement
• 4-wire, female connector configuration
• Threaded mounting type with 0.708-inch thread diameter
• 9.84-inch wiring harness length
• Built to OE standards for dimensional accuracy and consistent fit

OE Style Construction

Denso’s OE Style product line is designed for drivers who want a direct-fit emission control sensor that follows original equipment dimensions and connector layout. The 234-4186 is precision built for the correct application, helping simplify replacement on Porsche Boxster upstream and downstream sensor locations. Denso also uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management and long service life.

This part cross-references Bosch 13806 and NTK 25601 for the same application. It is also referenced by Porsche part numbers 98660612600 and 98660612601.

Vehicle Fitment

• Fits 2000-2002 Porsche Boxster, downstream, Loc. Secondary Catalyst; OE Style
• Fits 1997-1999 Porsche Boxster, upstream, OE Style
• Fits 1997-1999 Porsche Boxster, downstream, OE Style

Common Issues This Sensor May Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn sensor
• Reduced fuel economy caused by slow sensor response
• Rough idle or drivability concerns tied to exhaust feedback
• Emission test failures caused by a failing upstream or downstream sensor

Installation Notes and Tips

Confirm the sensor position before ordering, since this part is listed for both upstream and downstream Porsche Boxster applications. Verify connector style, thread size, and harness length against the original sensor before installation. Because this is a threaded, specific-fit oxygen sensor, proper routing and secure connector engagement are important for reliable operation.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for fit and performance. The OE Style design is intended to provide the correct part and the correct fit for the listed Porsche Boxster applications.