Denso 234-3109 Oxygen Sensor - Upstream, Upstream Front or Upstream Left

Denso OE Style Oxygen Sensor 234-3109

The Denso 234-3109 is an OE Style heated oxygen sensor built for direct replacement in select Nissan and Infiniti applications. It is engineered for exact fit and stable signal performance, helping maintain proper air-fuel control in upstream sensor locations.

Denso’s OE Style line focuses on first-time fit and factory-style replacement. This sensor uses a threaded mounting design, 3-wire configuration, male connector, and a 14.96-inch wiring harness length for the specified applications.

Key Features

• Heated oxygen sensor for upstream exhaust monitoring
• Specific fit design for direct replacement
• Threaded mounting type with 0.708-inch thread diameter
• 3-wire layout with male connector
• 14.96-inch wiring harness length
• OE Style replacement for factory-style service

Detailed Description

Denso 234-3109 is an emission control sensor designed to replace the original oxygen sensor on select 2000-2001 INFINITI I30 and Nissan models, including Frontier, Maxima, and Sentra applications. It is positioned for upstream front, upstream, and upstream left locations depending on the vehicle, making it a direct-fit solution for restoring accurate exhaust feedback. This part cross-references Bosch 15466 and NTK 24527 for the same application.

The OE Style construction reflects Denso’s focus on precise replacement dimensions and dependable sensor response. The sensor’s heated design helps it reach operating temperature quickly, which supports consistent closed-loop fuel control after startup. For shoppers searching for a 2001 Nissan Frontier upstream oxygen sensor, a 2001 Nissan Maxima upstream left O2 sensor, or a 2000-2001 INFINITI I30 upstream front replacement, Denso 234-3109 is built to match the listed fitment.

What It Helps Address

• Check engine light related to oxygen sensor performance
• Rough idle or drivability issues tied to incorrect air-fuel readings
• Reduced fuel economy from inaccurate upstream sensor data
• Slow sensor response during warm-up
• Failed emissions testing caused by a worn oxygen sensor

Installation Notes and Tips

Verify the connector style, wire count, thread diameter, and sensor position before installation. This part is specific fit, so it should be matched to the exact year, make, model, and listed position. Confirm whether your application requires upstream front, upstream, or upstream left placement, and check notes such as gray connector, clean air vehicle exclusion, or California exempt part usage where listed.

For best results, inspect the exhaust bung threads and wiring routing before installing the sensor. Use the vehicle’s service information to confirm the correct location on INFINITI I30, Nissan Frontier, Nissan Maxima, or Nissan Sentra applications.

Quality Assurance

Denso manufactures and tests its oxygen sensors to OE standards, with attention to exact replacement fit and sensor durability. The design includes an aluminum oxide trap layer intended to protect the ceramic element from silicone and lead contamination, supporting long-term sensor performance in the specified applications.