Denso 234-4840 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor 234-4840

Denso 234-4840 is an OE Style heated oxygen sensor built for direct replacement in specific downstream applications. It is engineered for the 2007-2009 Suzuki XL-7, 2008-2009 Chevrolet Equinox, and 2008-2009 Pontiac Torrent, with the correct fit and connector layout for the listed vehicles.

Denso’s OE Style line focuses on exact replacement fitment and sensor performance. This oxygen sensor uses a threaded mounting design, a female connector, 4 wires, and a 12.01-inch wiring harness length to match the original configuration on the supported applications.

Key Features

• Heated oxygen sensor for downstream placement
• Specific fit design for listed vehicle applications
• Threaded mounting type for direct installation
• Female connector with 4-wire configuration
• 12.01-inch wiring harness length
• 0.708-inch thread diameter
• OE Style replacement from Denso

OE Style Replacement Details

The Denso OE Style product line is built around direct-fit replacement parts that follow original equipment dimensions and electrical requirements. Part number 234-4840 is manufactured and tested to OE standards, with precision-built components intended to match the original sensor location and connection points on the supported Chevrolet Equinox, Pontiac Torrent, and Suzuki XL-7 applications. Denso also uses an aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable engine management and long service life.

This part cross-references ACDelco 213-3858 and Bosch 16938 for the same application.

Common Issues This Sensor Can Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect air-fuel feedback from a worn sensor
• Reduced fuel economy caused by slow sensor response
• Emissions test failure tied to oxygen sensor faults
• Rougher engine operation from inaccurate exhaust readings

Installation Notes

Verify downstream sensor location before installation and confirm connector style, wire count, and thread size against the original part. The threaded mounting design and specific-fit harness help simplify replacement on 2007-2009 Suzuki XL-7, 2008-2009 Chevrolet Equinox, and 2008-2009 Pontiac Torrent models. Always inspect the exhaust bung and wiring routing before final tightening.

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for consistent fit and performance. The OE Style design is intended to deliver the correct part and fit for the listed applications on the first installation.