Denso 234-4423 Oxygen Sensor - Downstream

OE-Style Oxygen Sensor for Suzuki Forenza

This Denso OE Style oxygen sensor is built for direct replacement on the downstream position of 2006-2008 Suzuki Forenza models. Part number 234-4423 is a specific-fit, heated sensor engineered to match the original mounting and connector layout for accurate service replacement.

Key Features

• OE Style replacement oxygen sensor for direct-fit service
• Heated sensor design for faster operating response
• Specific fit for the downstream location on Suzuki Forenza
• 4-wire configuration with male connector
• Threaded mounting with 0.708 in. thread diameter
• 27.56 in. wiring harness length for factory-style routing
• Aluminum oxide trap layer helps protect the sensing element from silicone and lead contamination

Detailed Description

Denso 234-4423 is an emission control oxygen sensor designed for 2006-2008 Suzuki Forenza downstream applications. As part of Denso’s OE Style line, this sensor is precision built for exact replacement and first-time fit, helping restore proper exhaust feedback to the engine management system. The heated design supports quicker sensor operation, while the threaded mounting and specific-fit connector help simplify replacement on the Suzuki Forenza.

Denso’s OE-style construction focuses on accurate signal performance and durability. The sensor’s aluminum oxide trap layer is intended to protect the ceramic element from contamination that can shorten service life and affect engine performance. If you are replacing a worn downstream oxygen sensor on a Suzuki Forenza, part number 234-4423 provides a direct-fit solution matched to the original application.

This part cross-references NTK 25192 for the same application.

What It Helps Address

• Check engine light related to downstream oxygen sensor performance
• Incorrect exhaust oxygen feedback to the engine control system
• Reduced fuel economy caused by a failing sensor
• Rough or inconsistent engine operation tied to sensor degradation
• Contamination-related sensor wear from silicone or lead exposure

Installation Notes and Tips

Fits 2006-2008 Suzuki Forenza, downstream. Confirm the connector style, wire count, and threaded mounting before installation. Use proper oxygen sensor service tools and inspect the harness routing to keep the 27.56 in. lead clear of hot exhaust components. Verify the replacement matches the original downstream location before clearing diagnostic codes.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards for fit and performance consistency. The OE Style line is built as a direct replacement option for vehicles that require factory-style dimensions, connector configuration, and sensor response.