Denso 234-4245 Oxygen Sensor - Downstream

Denso 234-4245 Oxygen Sensor Overview

Denso 234-4245 is an OE Style heated oxygen sensor built for specific downstream applications. It is engineered for exact replacement fitment and stable signal performance in emissions control systems, with a threaded mounting design and 4-wire female connector.

Compatible with 2007-2010 Chevrolet Cobalt and Chevrolet HHR, plus 2007-2010 Pontiac Solstice and Saturn Sky downstream applications, this Denso oxygen sensor is a direct-fit option for vehicles that need precise exhaust feedback. The Denso 234-4245 is built to match OE-style requirements for the listed applications.

Key Features

• OE Style replacement oxygen sensor for specific downstream locations
• Heated sensor design for faster operating temperature
• Specific fit application for accurate installation
• 4-wire configuration with female connector
• Threaded mounting type with 0.708 in. thread diameter
• Wiring harness length: 25.87 in.

Product Details

Denso oxygen sensors are manufactured and tested to OE standards, with precision-built components intended to match the original part’s fit and function. This sensor uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting consistent engine management performance and long service life. For shoppers searching for a downstream oxygen sensor for Chevrolet Cobalt, Chevrolet HHR, Pontiac Solstice, or Saturn Sky, part number 234-4245 provides a direct OE-style replacement path.

This part cross-references ACDelco (e.g., 213-4243) for the same application.

What This Sensor Helps Address

• Check engine light caused by a failing downstream oxygen sensor
• Incorrect exhaust oxygen readings affecting fuel control strategy
• Reduced fuel economy from inaccurate sensor feedback
• Emissions test failures related to sensor performance
• Slow or unstable sensor response in the exhaust stream

Installation Notes and Fitment

• Fits 2008-2010 Chevrolet Cobalt, Downstream, OE Style
• Fits 2008-2010 Chevrolet HHR, Downstream, OE Style
• Fits 2009-2010 Saturn Sky, Downstream, OE Style
• Fits 2009 Pontiac Solstice, Downstream, OE Style
• Fits 2007-2008 Pontiac Solstice, Downstream, 2nd Design; w/ 26" Downstream Sensor; OE Style
• Fits 2007-2008 Saturn Sky, Downstream, 2nd Design; w/ 37" Downstream Sensor; OE Style

Confirm the downstream sensor location and connector style before installation. This is a specific-fit sensor, so matching the vehicle year, model, and notes is important for proper installation. Search terms such as downstream oxygen sensor for 2008 Chevrolet Cobalt, 2009 Chevrolet HHR oxygen sensor, or 2007 Saturn Sky downstream O2 sensor align with this application.

Quality Assurance

Denso manufactures this OE Style oxygen sensor to strict original-equipment standards and tests each component for replacement accuracy and fit. The design focuses on dependable sensor response, contamination resistance, and consistent performance in the listed Chevrolet, Pontiac, and Saturn applications.