Denso 234-4251 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4251

Denso 234-4251 is a specific-fit heated oxygen sensor built to OE-style dimensions and electrical requirements. It is designed for downstream placement on select Chevrolet, Buick, GMC, Saturn, and Pontiac applications, including Chevrolet Malibu, Equinox, and GMC Terrain coverage.

The Denso OE Style line focuses on exact replacement fit and consistent sensor performance. This oxygen sensor uses a threaded mounting design, a female connector, 4 wires, and a 14.88-inch wiring harness for a direct replacement on the listed vehicles.

Key Features

• Heated oxygen sensor for downstream exhaust monitoring
• Specific fit for listed vehicle applications
• OE-style replacement design for proper connector and thread match
• 4-wire configuration with female connector
• Threaded mounting type with 0.708-inch thread diameter
• 14.88-inch wiring harness length
• Built to Denso OE standards for replacement accuracy

Product Details

Denso 234-4251 is engineered as an OE-style oxygen sensor for vehicles that require a downstream sensor with the correct harness length, connector style, and threaded mounting interface. It is listed for 2007-2012 Saturn Aura and Sky, 2008-2012 Chevrolet Malibu, 2008-2009 Pontiac Solstice, 2009 Pontiac G6, 2010 Buick Allure and LaCrosse, 2010 Chevrolet Equinox, 2010 GMC Terrain, and 2010 Saturn Vue. This part number, 234-4251, is also cross-referenced with Bosch 15254 for the same application.

Denso’s OE-style sensor construction uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable exhaust feedback and long service life. For buyers searching for a downstream oxygen sensor for Chevrolet Malibu, GMC Terrain, or Saturn Vue, this part number provides a direct-fit replacement path.

Common Issues This Sensor Can Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect exhaust oxygen readings from a worn sensor
• Reduced fuel economy caused by inaccurate air-fuel feedback
• Failed emissions inspection tied to sensor performance
• Driveability concerns from degraded sensor response

Installation Notes

Verify the vehicle’s year, make, model, and downstream sensor location before installation. Match the connector, wire count, and threaded mounting style to the original sensor. On 2008 Saturn Aura applications, confirm whether the vehicle uses the 1st design marked 12615904 or the 2nd design marked 12615904 before ordering. On 2007 Saturn Aura, this part is listed for the 2nd design downstream sensor.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for replacement accuracy and first-time fit. The OE Style product line is built for direct replacement applications where correct fitment and dependable sensor operation are required.