Denso 234-4065 Oxygen Sensor - Downstream, Upstream, Upstream Rear or Upstream Right

Denso OE Style Oxygen Sensor 234-4065

Denso 234-4065 is an OE Style heated oxygen sensor built for direct replacement in select Acura and Honda applications. It is engineered for exact fitment, stable signal performance, and reliable exhaust monitoring in vehicles such as the Honda Civic, Honda Accord, Acura TL, and Acura RL.

Key Features

• Heated oxygen sensor with 4-wire design
• Specific-fit, threaded mounting for direct replacement
• Male connector with 20.47 in. wiring harness length
• 0.708 in. thread diameter for OE-style installation
• Aluminum oxide trap layer helps protect the sensing element from silicone and lead contamination
• Built and tested to OE standards for consistent replacement performance

OE Style Design Details

The Denso OE Style line focuses on first-time fit and factory-style operation. Part number 234-4065 is precision built to match the original sensor layout, making it a practical choice when replacing a worn upstream or downstream oxygen sensor on select Acura and Honda models. Denso 234-4065 is designed to support accurate exhaust feedback so the engine control system can maintain proper air-fuel management.

This part cross-references Bosch 13007 and NTK 24172 for the same application.

Fitment

• Fits 1996-2003 Acura RL, Upstream Right
• Fits 1996-2000 Honda Civic, Downstream
• Fits 1991-1999 Acura NSX, Upstream Rear
• Fits 1999 Acura TL, Upstream
• Fits 1996-1998 Acura TL, Upstream Right
• Fits 1995-1997 Honda Accord, Upstream
• Fits 1996-1997 Honda Civic del Sol, Downstream
• Fits 1991-1995 Acura Legend, Upstream Right

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a failing sensor
• Reduced fuel economy caused by slow or inaccurate exhaust feedback
• Rough idle or drivability issues tied to sensor degradation
• Emissions test failures caused by a worn oxygen sensor

Installation Notes

Confirm the sensor position before ordering, since this part is listed for upstream right, downstream, upstream rear, and upstream locations depending on the vehicle. Match the connector style, thread diameter, and harness length to the original sensor before installation. For best results, inspect the exhaust bung threads and wiring routing during replacement on Honda Accord, Honda Civic, and Acura TL applications.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards, with a design focused on exact replacement fit and long-term sensor protection. The OE Style construction and contamination-resistant trap layer support dependable operation in the specified Acura and Honda applications.