Denso 234-4814 Oxygen Sensor - Upstream

Denso 234-4814 Oxygen Sensor for 2003 Sentra

The Denso 234-4814 is an OE Style heated oxygen sensor built for exact replacement and first-time fit. It is engineered for the upstream position on the 2003 Nissan Sentra, with application-specific dimensions and a threaded mounting design for direct service replacement.

Denso’s OE Style line focuses on factory-style fit and sensor performance. This oxygen sensor uses a 4-wire heated design, a male connector, and an 18.31-inch wiring harness length to match the original configuration on the listed application.

Key Features

• OE Style replacement oxygen sensor for direct-fit service
• Heated sensor design for faster operating response
• Specific fit for the upstream location on the 2003 Nissan Sentra
• 4-wire configuration with male connector
• Threaded mounting type with 0.708-inch thread diameter
• 18.31-inch wiring harness length for application-specific routing
• Built to Denso OE standards for consistent sensor replacement

Product Details

This Denso oxygen sensor is designed for the 2003 Nissan Sentra, upstream, with notes for vehicles built to 04/03 and excluding California applications. The Denso 234-4814 is intended to restore accurate exhaust-gas feedback to the engine control system, helping maintain proper air-fuel management and emissions monitoring. This part cross-references ACDelco 213-3066 and Bosch 16511 for the same application.

What This Sensor Helps Address

• Check engine light concerns related to oxygen sensor performance
• Slow or inaccurate upstream exhaust-gas readings
• Fuel mixture control issues caused by a worn sensor
• Reduced fuel economy from degraded sensor response
• Emissions test failures tied to sensor output problems

Installation Notes

Verify the vehicle build date and emissions configuration before ordering, since this listing applies to 2003 Nissan Sentra models built to 04/03 and excludes California vehicles. Confirm the upstream sensor location, connector style, wire count, and thread size against the original part before installation. The threaded mounting design supports direct replacement in the original sensor location.

Quality Assurance

Denso manufactures and tests this OE Style oxygen sensor to strict original-equipment standards. The sensor includes an aluminum oxide trap layer that helps protect the ceramic element from silicone and lead contamination, supporting stable operation and long service life in normal use.