ISR Performance o2 Harness Extension for Nissan VQ35DE 350Z 02-04 Only/ G35 03-05 Only

The ISR Performance O2 Harness Extension is a plug-and-play primary O2 sensor wiring extension for VQ35DE-equipped 350Z and G35 builds running long tube headers. Built with OEM-grade components and MIL-spec wiring, this kit eliminates the need to cut, splice, or modify your factory O2 harness during a long tube header install.

What It Does

When you install long tube headers on a VQ35DE, the primary O2 sensor location moves significantly further from the cylinder head than the factory exhaust manifold position. The factory O2 sensor harness isn't long enough to reach the new sensor location, which forces most installs to cut and splice the existing harness. Splicing O2 sensor wiring is a common source of long-term electrical issues, ECU codes, and lean conditions. This extension kit gives you the additional length you need without ever touching the factory harness.

Construction

• OEM housings, locks, wire seals, and terminals
• MIL Spec M22759/32 Tefzel wire
• Direct plug-and-play installation

Fitment

This extension only fits vehicles with the heated O2 sensors that use BLUE and GREEN connectors:

• 2002-2004 Nissan 350Z (VQ35DE)
• 2003-2005 Infiniti G35 (VQ35DE)

Verify your O2 sensor connector colors before ordering. Later VQ35DE applications (2005+ 350Z, 2006+ G35) use different connectors and are not compatible with this harness.

Product Details

Brand: ISR Performance

Part Number: IS-VQ35O2-EXT

Type: Primary O2 sensor harness extension

Vehicle Fitment: 2002-2004 Nissan 350Z, 2003-2005 Infiniti G35

Engine Compatibility: VQ35DE

Connector Compatibility: Blue and green heated O2 sensor connectors only

Wire Spec: MIL Spec M22759/32 Tefzel

Connector Components: OEM housings, locks, seals, and terminals

Installation: Plug-and-play, no cutting or splicing required

Required For: Long tube header installation on VQ35DE

Legality: Off-road and competition use only