Denso 234-4488 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4488

Denso 234-4488 is an OE Style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for downstream use on select Mini Cooper, Mini Cooper Countryman, and Mini Cooper Paceman applications, with the connector, thread, and harness layout matched for direct installation.

Denso’s OE Style line focuses on factory-style fit and sensor performance. This oxygen sensor uses a precision-built design, a heated sensing element, and Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine operation and fuel control.

Key Features

• OE Style replacement oxygen sensor for direct-fit service
• Heated sensor design for faster operating response
• Specific fit application with 4-wire configuration
• Male connector and threaded mounting type
• Wiring harness length: 17.52
• Thread diameter: 0.708
• Built to OE standards for Mini downstream applications

Fitment Details

• Fits 2011-2016 Mini Cooper Countryman, downstream, OE Style
• Fits 2013-2016 Mini Cooper Paceman, downstream, OE Style
• Fits 2007-2015 Mini Cooper, downstream, OE Style

Detailed Description

This Denso oxygen sensor 234-4488 is a direct replacement for downstream monitoring on select Mini models, including Mini Cooper, Mini Cooper Countryman, and Mini Cooper Paceman. It is designed to match OE specifications for fit, connector style, and sensor construction, helping simplify replacement on vehicles that require a specific-fit heated oxygen sensor.

This part cross-references Bosch 15379 and NTK 25198 for the same application. The Denso OE Style product line is built around factory-style replacement parts that mirror original equipment dimensions and performance requirements, making it a practical choice when replacing a worn or slow-responding downstream sensor.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio feedback from a failing downstream sensor
• Reduced fuel economy caused by inaccurate exhaust readings
• Rough or inconsistent engine operation tied to sensor degradation
• Contamination-related sensor wear from silicone or lead exposure

Installation Notes and Tips

Confirm the downstream location before ordering, since this part is specific to that position. Verify the connector style, wire count, and thread diameter against the original sensor on the vehicle. Because oxygen sensors are exposed to heat and corrosion, use proper removal procedures and inspect the harness routing before installation.

Quality Assurance

Denso manufactures and tests these oxygen sensors to OE standards for fit and performance consistency. The sensor design includes an aluminum oxide trap layer intended to help protect the sensing element and support long-term reliability in Mini Cooper, Mini Cooper Countryman, and Mini Cooper Paceman applications.