ETL INDUSTRIES 36" O2 Sensor Extension Harness 4-Pin – For LS1/LS2/LS6 Corvette GTO CTS-V (2Pcs, Front Only)

Need to extend your front oxygen sensors on your LS-powered GM? This 36" 4-pin extension harness gives you the extra length for long-tube headers or relocated O2 bungs – front sensors only.

⚠️ IMPORTANT – Front Sensors Only
This harness is designed for front (upstream) oxygen sensors only. It will NOT work on rear (downstream) sensors.

Compatibility (confirmed – front sensors only):
✅ 2004-2006 Chevrolet Corvette (LS1/LS6)
✅ 2004-2005 Pontiac GTO (LS1)
✅ 2005-2006 Pontiac GTO (LS2)
✅ 2008-2009 Cadillac CTS-V (LS2/LS3)
✅ 2004-2007 Cadillac CTS-V (LS6)
✅ 2008-2009 Pontiac G8 GT (V8)
✅ LS1/LS2/LS6 swapped vehicles – check connector type

Specs:
| Specification | Detail |
|---------------|--------|
| Length | 36 inches |
| Pin Count | 4-Pin |
| Connector Type | Square |
| Color | Grey |
| Quantity | 2 pieces |
| Position | Front (Upstream) Only |

Check your connector before ordering:
This harness uses a square 4-pin grey connector. Please verify your factory O2 sensor plug matches this shape and pin count. Round plugs will NOT fit.

Why choose this one:
✅ 36" length – enough for most long-tube header setups
✅ 4-pin square plug – direct fit for compatible GM vehicles
✅ 2 pieces included – covers both front sensors
✅ 24-hour customer support – we help with fitment

Not sure if it fits? Message us with a photo of your current O2 sensor plug and we'll verify for you.

Installation tip: Use dielectric grease on the connector pins to prevent corrosion.