Denso 234-4551 Oxygen Sensor - Downstream

OE-Style Oxygen Sensor for Hyundai and Kia

This Denso OE Style oxygen sensor is a specific-fit replacement for downstream applications on select Hyundai Sonata and Kia Optima models. Built to match original equipment dimensions and connector layout, Denso 234-4551 supports accurate exhaust feedback for vehicles that need a direct-fit sensor service part.

Key Features

• OE Style, specific-fit oxygen sensor for downstream placement
• Heated sensor design with 4-wire configuration
• Female connector with threaded mounting type
• Wiring harness length: 20.55
• Thread diameter: 0.708
• Built to strict OE standards for exact replacement fit
• Uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination

Product Details

Denso 234-4551 is engineered as an OE-style oxygen sensor for direct replacement in emissions control service. It is designed for downstream use on 2015 Kia Optima and 2011-2014 Hyundai Sonata applications listed below, with fitment that matches the original sensor location and connector style. This part cross-references Hyundai 392102G560 and Walker Products 250-24913 for the same application. If you are replacing a downstream oxygen sensor on a Hyundai Sonata or Kia Optima, Denso 234-4551 provides the correct fit and electrical configuration for the specified vehicles.

What It Helps Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect exhaust oxygen readings affecting fuel control
• Reduced fuel economy caused by a failing sensor
• Slow or inaccurate sensor response in emissions monitoring
• Replacement needs after contamination or sensor aging

Installation Notes and Tips

• Confirm downstream location before ordering; this sensor is not listed for upstream use.
• Match the connector, wire count, and threaded mounting style to the original part.
• Inspect the harness routing and connector condition before installation.
• Verify vehicle build date notes for 2011 Hyundai Sonata applications, including the 03/21/2011 and 11/15/2010 breakpoints shown in fitment.
• Use the listed fitment only for the exact Hyundai Sonata and Kia Optima applications provided.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for precise replacement fitment and consistent performance. The OE Style line is built to deliver the correct part and fit for the listed Hyundai Sonata and Kia Optima applications, with contamination-resistant sensor protection for long service life.