O2 Oxygen Sensor Upstream for Infiniti Vehicles (2002-2006)

Precision Upstream A/F Monitoring for the VK45DE and VQ35DE Platforms

Who It’s For: Engineered for Infiniti owners running the VK45DE V8 or VQ35DE V6 powerplants who are experiencing erratic idling, poor fuel economy, or a stubborn check engine light.

The Symptom: The factory upstream sensors on these Infiniti platforms are the primary eyes of the ECU, responsible for monitoring the air-fuel ratio before the exhaust hits the catalytic converters. Over time, heat cycles and carbon deposits make these sensors "lazy," leading to slow response times. When this happens, your engine struggles to find the stoichiometric balance, often resulting in a rich-running condition that kills your MPG, fouls your spark plugs, and causes that sluggish, heavy feeling during acceleration.

The Engineering Fix: This kit features a pair of high-precision, 4-wire heated oxygen sensors designed to provide the ECU with an instantaneous voltage signal. By utilizing a 820mm wire lead and the correct dark green connector, these sensors ensure a direct-fit, plug-and-play installation without the need for splicing. The zirconia ceramic element is housed in a stainless steel body to withstand the high exhaust gas temperatures common in the FX45 and Q45 engine bays, ensuring your long-term fuel trims stay within factory spec.

Why Mechanics Choose This Kit

• Optimized Combustion: Restores the precise feedback loop needed for the VK45DE and VQ35DE to maintain peak horsepower and torque.
• Durable Construction: Features high-temperature internal seals and a 4-wire configuration to prevent signal interference and thermal shock.
• Zero-Mod Installation: The 820mm harness length is specifically measured for the Infiniti engine bay layout, ensuring the wiring stays clear of hot exhaust manifolds.

Technical Specifications

Compatibility & OEM Reference

Fits the Following Vehicles:

• 2002-2006 Infiniti Q45 4.5L V8
• 2003-2004 Infiniti M45 4.5L V8
• 2003-2004 Infiniti G35 3.5L V6
• 2003-2005 Infiniti FX45 3.5L V6 / 4.5L V8

Interchange Part Numbers:

234-4308, 24401, 22690-AL600, 22691-AR210

The Performance Promise

Buy with confidence. These sensors are built and tested to strict quality control standards to ensure your Infiniti regains its smooth, responsive power delivery. Backed by real automotive experts and fast shipping.