Denso 234-4483 Oxygen Sensor - Downstream

Denso OE Style Oxygen Sensor for Fiat 500

The Denso 234-4483 is a specific-fit heated oxygen sensor built to OE-style standards for the 2012-2019 Fiat 500, downstream position. It is engineered for direct replacement performance with the correct connector, thread size, and harness length for a precise installation.

Key Features

• Specific-fit heated oxygen sensor for downstream applications
• OE Style design for direct replacement on the Fiat 500
• 4-wire configuration with male connector
• Threaded mounting with 0.708 in. thread diameter
• 26.77 in. wiring harness length for proper routing
• Denso part number 234-4483 for easy identification

Product Details

Denso 234-4483 is designed for 2012-2019 Fiat 500 downstream oxygen sensor replacement needs. The sensor uses a heated design to help the engine management system monitor exhaust oxygen content efficiently, while the specific-fit construction supports a first-time fit on the intended application. Denso’s OE Style line focuses on exact replacement dimensions and dependable electrical connection, making this a practical choice when replacing a worn or faulty downstream sensor on a Fiat 500. This part cross-references Bosch 18109 for the same application.

The OE Style product line is built around direct-fit replacement parts that match original equipment requirements closely, helping simplify selection for technicians and DIY installers working on emission control repairs.

Common Issues This Sensor Can Help Address

• Check engine light related to downstream oxygen sensor faults
• Incorrect exhaust oxygen readings reported to the engine control module
• Reduced fuel economy caused by inaccurate sensor feedback
• Emission test failures tied to a failing oxygen sensor
• Rougher engine operation when the sensor signal is degraded

Installation Notes and Tips

Verify the downstream location before installation and confirm the connector style, wire count, and thread diameter match the original sensor. The threaded mounting design is intended for direct replacement use on the specified Fiat 500 applications. For best results, inspect the exhaust threads and wiring route before installation to ensure the harness is positioned away from heat and moving components.

Quality Assurance

Denso manufactures and tests this oxygen sensor to OE standards, with precision-built components intended to match original fit and function. The sensor also uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting long service life and stable engine performance.