Denso 234-4338 Oxygen Sensor - Downstream or Downstream Right

Denso OE Style Oxygen Sensor 234-4338

Denso 234-4338 is an OE-style heated oxygen sensor built for specific-fit replacement on select Cadillac applications. It is engineered for accurate exhaust feedback, stable engine management, and a first-time fit on downstream locations.

The Denso OE Style line focuses on direct replacement parts built and tested to OE standards. This oxygen sensor uses a threaded mounting design, a female connector, four wires, and a 31.50-inch wiring harness for a factory-style installation on the correct vehicle and position.

Key Features

• Part number 234-4338 for direct identification
• Heated oxygen sensor design for faster operating response
• Specific fit replacement for select Cadillac downstream positions
• 4-wire configuration with female connector
• Threaded mounting type with 0.708-inch thread diameter
• 31.50-inch wiring harness length
• OE-style construction for exact replacement fit

Product Details

This Denso oxygen sensor is designed for downstream exhaust monitoring on 2006-2009 Cadillac XLR, downstream; 2007-2009 Cadillac SRX, downstream right; and 2007-2010 Cadillac STS, downstream right. If you are searching for a Denso 234-4338 oxygen sensor for Cadillac STS downstream right or a Denso 234-4338 replacement for Cadillac SRX and XLR applications, this OE Style sensor matches the listed positions and connector layout.

Denso’s OE Style product line is built as a precision replacement solution, with attention to fit, connector style, and sensor response. The sensor also incorporates an aluminum oxide trap layer intended to protect the ceramic element from silicone and lead contamination, helping maintain sensor performance over time. This makes it a practical choice for drivers replacing a worn downstream oxygen sensor on Cadillac STS, SRX, or XLR models.

This part cross-references ACDelco 213-3631 and Bosch 15141 for the same application.

What This Sensor Helps Address

• Check engine light related to oxygen sensor performance
• Incorrect exhaust feedback to the engine control system
• Reduced fuel economy caused by a failing downstream sensor
• Rough or inconsistent engine operation tied to sensor degradation
• Emissions test failures caused by a faulty oxygen sensor

Installation Notes and Tips

Confirm the vehicle year, model, and sensor position before ordering. This is a specific-fit sensor, so match the downstream right or downstream location exactly to the application listed. Inspect the connector, harness routing, and thread size before installation to ensure the replacement follows the original sensor layout.

For best results, install on the correct Cadillac STS, SRX, or XLR application and verify the exhaust system is cool before service. Use proper sensor removal tools and follow factory service procedures for wiring and torque specifications.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for direct replacement use. The OE-style design, exact-fit construction, and contamination-resistant trap layer reflect Denso’s focus on consistent sensor performance and long service life.