Denso 234-4574 Oxygen Sensor - Downstream, Downstream Front or Downstream Left

Denso OE Style Oxygen Sensor 234-4574

Denso 234-4574 is an OE Style heated oxygen sensor built for direct replacement on select Acura and Honda applications. It is engineered for a specific fit and uses a threaded mounting design for accurate installation on the intended downstream positions.

Key Features

• OE Style replacement oxygen sensor for emission control systems
• Heated sensor design for faster operating response
• Specific fit for the listed Acura and Honda applications
• 4-wire configuration with female connector
• 13.70 in. wiring harness length
• Threaded mounting with 0.708 in. thread diameter
• Built to Denso OE standards for exact replacement fitment
• Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination

Product Details

This Denso oxygen sensor is part of the OE Style line, which focuses on direct replacement parts built to match original equipment fit and function. The sensor is manufactured and tested to OE-level standards, with precision construction intended to deliver first-time fitment on the correct downstream locations. Denso 234-4574 is used on select Acura ILX, NSX, RLX, TLX, RDX and Honda Accord, Civic, Crosstour, and CR-V applications, including downstream, downstream left, and downstream front positions where listed.

This part cross-references Bosch 18050 for the same application.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect air-fuel ratio readings from a worn downstream sensor
• Reduced fuel economy caused by inaccurate exhaust feedback
• Slow sensor response after heat cycling or contamination
• Emission system faults on Acura and Honda vehicles

Installation Notes and Tips

Verify the vehicle position before ordering, since this part is listed for downstream, downstream left, and downstream front locations depending on application. Confirm connector style, wire count, and thread diameter against the original sensor before installation. For best results, inspect the harness routing and exhaust threads for damage or contamination before fitting the new sensor.

Quality Assurance

Denso manufactures this sensor to strict OE standards and tests each design for direct replacement accuracy, consistent performance, and long service life. The OE Style line is built to provide the right part and the right fit for the listed applications.