ISR Performance o2 Harness Extension for Nissan VQ37

The ISR Performance VQ37 O2 Harness Extensions are plug-and-play extension harnesses for the primary 4-wire O2 sensors on 2011+ 370Z and G37 builds. Eliminate the cut-and-splice step when installing long-tube headers. these plug into your factory O2 sensor connectors and extend the wires far enough to reach the long-tube primary sensor positions.

What It Does

Long-tube headers move the primary O2 sensor location further from the factory wiring harness than your factory wires can reach. The traditional fix is to cut and splice extension wire into the harness, which is functional but messy and not particularly reliable. These pre-made extensions plug directly into the factory connector on one end and your O2 sensor on the other, completing the circuit without any wire cutting. Cleaner install, no soldering, and easy to remove if you go back to factory headers later.

Fitment

Most 2011+ 370Z and G37 models with the 4-wire primary O2 sensor connector. Inspect your factory O2 sensor connector before ordering to confirm you have the matching plug type. Sold as a pair (one per primary O2 sensor / bank).

Product Details

Brand: ISR Performance

Part Number: IS-VQ37O2-EXT1

Type: O2 sensor harness extensions

Vehicle Fitment: 2011+ Nissan 370Z, Infiniti G37 (4-wire primary O2 connector)

Engine: VQ37VHR

Sensor Type: Primary (upstream), 4-wire

Application: Long-tube header installs requiring extended O2 sensor wiring

Installation: Direct plug-and-play (no cutting or splicing)

Pre-order Check: Inspect factory O2 connector to confirm plug type match

Sold: Pair

Legality: Off-road and competition use only