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SKU: CAS-109004 | UPC: 842422120597
Kooks CAS-109004 12-Inch O2 Sensor Extension Harness for 2004–2009 Cadillac CTS-V & 2008–2009 Pontiac G8 LS2/LS3
The Kooks 12-inch oxygen sensor extension harness solves wiring reach issues when installing long-tube headers on 2004–2009 Cadillac CTS-V and 2008–2009 Pontiac G8 models with LS2 or LS3 engines, providing a plug-and-play solution that repositions the upstream O2 sensors for accurate air-fuel monitoring and ECU calibration without triggering check engine lights or lean/rich codes.
Built from high-temperature shielded wiring with OEM-style weatherproof connectors rated over 1,200°F, this harness maintains perfect signal integrity under extreme exhaust heat and vibration from high-RPM or track use. The 12-inch length offers the exact reach needed for Kooks long-tube headers without excess slack that could cause chafing or shorts.
For CTS-V and G8 owners upgrading to aftermarket headers, the CAS-109004 harness is the essential wiring solution for seamless installation and flawless engine management. Sold individually – one per bank.
Key Features
- 12-inch length for precise O2 sensor relocation
- OEM-style weatherproof connectors
- High-temp shielded wiring rated over 1,200°F
- Plug-and-play – no cutting or splicing
- Prevents CEL from O2 sensor relocation
- Direct fit for Kooks LS2/LS3 header kits
Product Notes
- Sold individually – one per bank (order two for full vehicle)
- Front upstream sensor extension only
- Fits 2004–2009 CTS-V & 2008–2009 Pontiac G8 LS2/LS3
California Proposition 65: Contains chemicals known to the State of California to cause cancer or reproductive harm.
Warranty: Limited lifetime against manufacturing defects to original purchaser.
Installation Notes
- Unplug factory O2 sensor connector
- Route extension harness to new sensor location avoiding exhaust heat
- Plug into OEM harness and relocated sensor
- Secure with zip ties
This Part Fits
| Year | Make | Model | Engine |
|---|---|---|---|
| 2004–2009 | Cadillac | CTS-V | LS2 / LS3 6.0L / 6.2L |
| 2008–2009 | Pontiac | G8 | LS2 / LS3 6.0L / 6.2L |
Note: Front upstream O2 extension for Kooks long-tube headers. Order two for both banks.
What's Included in the Purchase
- (1) 12-Inch O2 Sensor Extension Harness
- Part Number: Kooks CAS-109004
Why Choose Kooks?
- Over 60 years of championship-winning exhaust engineering
- Precision wiring components tested in 1,000+ HP builds
- Limited lifetime warranty and expert installation support
Frequently Asked Questions
-
Q: One or two needed?
A: One per bank – order two for complete vehicle -
Q: Front or rear?
A: Front upstream only -
Q: Fits G8 GT and GXP?
A: Yes, same LS2/LS3 connector
Shipping & Handling
- Method: UPS or Fed Ex Ground.
- Availability: Typically ships same day or next if in stock.
- Packaging: Anti-static bag in protective box.
Read More
Kooks Exhaust
Shop Kooks Headers and Kooks Exhaust products at Black Ops Auto Works for premium American-made exhaust systems, long tube headers, shorty headers, cat-back exhaust systems, axle-back exhaust systems, connection pipes, catted connection pipes, and performance exhaust components built for street, strip, and track applications. With decades of motorsports heritage, Kooks is trusted by enthusiasts, engine builders, and racers looking for high-quality stainless steel exhaust upgrades with proven fitment and performance. American-Made Kooks Performance Exhaust Founded in 1962, Kooks Headers has earned a strong reputation for USA-made exhaust performance, precision craftsmanship, and race-proven durability. Kooks products are manufactured using premium stainless steel and designed to support improved exhaust flow, aggressive sound, and reliable long-term performance on high-horsepower builds. Shop Kooks Headers & Exhaust Parts by Category Browse Kooks exhaust components and performanc...
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