Denso 234-4122 Oxygen Sensor - Downstream or Upstream

Denso 234-4122 Oxygen Sensor for OE-Style Replacement

Denso 234-4122 is a heated oxygen sensor built to OE-style specifications for direct replacement in select Honda and Acura applications. It is engineered for exact fitment, stable signal performance, and reliable exhaust monitoring on downstream and upstream positions where listed.

Key Features

• Heated oxygen sensor for faster operating temperature and consistent feedback
• Specific-fit design for direct replacement on listed vehicles
• 4-wire configuration with female connector
• Threaded mounting with 0.708 in. thread diameter
• 21.26 in. wiring harness length for application-specific routing
• OE-style construction from Denso’s OE Style line

OE Style Construction

Denso’s OE Style line focuses on direct-fit replacement parts built to match original equipment requirements. The 234-4122 oxygen sensor uses precision-built components for first-time fitment and consistent installation on the listed Honda Civic, Acura RSX, Acura EL, and Honda Accord applications. Denso also incorporates an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting long-term sensor performance and fuel control accuracy.

This part cross-references Bosch 13532 and NTK 24290 for the same application.

Vehicle Fitment

• Fits 2002-2005 Honda Civic, downstream, OE Style
• Fits 2001-2003 Honda Civic, upstream, OE Style
• Fits 2000-2002 Honda Accord, downstream, SULEV; OE Style
• Fits 2002-2004 Acura RSX, downstream, OE Style
• Fits 2001-2003 Acura EL, upstream, OE Style

What This Sensor Helps Address

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

Installation Notes and Tips

Confirm the sensor position before ordering, since this part is listed for both upstream and downstream applications. Match the connector style, wire count, and threaded mounting dimensions to the original sensor on the vehicle. For best results, inspect the harness routing and exhaust threads before installation, and verify the application against the exact year, make, and model listed above.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for direct replacement use. The OE-style design, application-specific fit, and contamination-resistant sensor construction are intended to deliver consistent performance on the listed vehicles.