Kooks 19-20 Ram 1500 SXT O2 Extension Harness

Performance Engineered in the USA: Proven Gains for Street and Track Builds

The Kooks CAS-109264 8-inch front oxygen sensor extension harness solves the common wiring reach issue when installing long-tube headers on 2019 and 2020 Ram 1500 trucks with the 5.7L HEMI V8, providing a plug-and-play 5-pin connection that repositions the upstream O2 sensor precisely 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 connectors rated over 1,200°F, this extension maintains signal integrity under extreme exhaust heat and vibration from high-RPM operation. The 8-inch length offers the exact reach needed for Kooks long-tube headers without excess slack that could cause chafing or shorts.

For Ram 1500 owners upgrading to aftermarket headers who need a simple, reliable O2 relocation solution, the CAS-109264 harness delivers the essential wiring bridge for seamless installation and flawless engine management.

Key Features

• 8-inch length for precise front O2 sensor relocation
• 5-pin OEM-style connectors for plug-and-play fitment
• High-temperature shielded wiring rated over 1,200°F
• Vibration-resistant construction for track durability
• Maintains accurate air-fuel ratio readings and ECU function
• Direct replacement for lost or damaged extensions in header kits

Product Notes

• Front upstream sensor extension only and rear requires separate harness
• Designed specifically for Kooks header installations on 2019 and 2020 Ram 1500 5.7L
• Inspect connections regularly to prevent heat damage

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

• Locate factory O2 harness and unplug sensor connector
• Route extension harness to new sensor location avoiding exhaust heat
• Plug into OEM harness and sensor and hand-tight, secure with zip ties
• Clear any codes and perform drive cycle for ECU relearn

This Part Fits

Note: Front upstream O2 extension for Kooks header kits on 2019 and 2020 Ram 1500 5.7L. Verify connector type.

What's Included in the Purchase

• (1) 8-Inch 5-Pin Oxygen Sensor Extension Harness
• Part Number: Kooks CAS-109264

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: Is this for front or rear O2 sensors?
  A: Front upstream only and rear requires different harness
• Q: Will it work with non-Kooks headers?
  A: Yes, fits any 2019 and 2020 Ram 1500 5.7L header with 5-pin O2 relocation
• Q: Does it affect tuning?
  A: No, maintains OEM signal quality for accurate ECU readings
• Do Kooks headers require a tune after installation?
  Yes. A professional tune is strongly recommended after installing long tube headers. The significant improvement in exhaust flow changes air fuel ratios and requires ECM recalibration to achieve optimal power output and safe operation.
• Will these headers void my factory powertrain warranty?
  Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your vehicle warranty simply because you installed an aftermarket part unless they prove the component directly caused the failure. Consult your dealer for specifics on your situation.
• Q: Do these Kooks headers require a tune after installation?
  A: Yes. A professional tune is strongly recommended after installing long tube headers. The significant improvement in exhaust flow changes air fuel ratios and requires ECM recalibration to achieve optimal power output and safe operation.
• Q: Will Kooks headers void my factory powertrain warranty?
  A: Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your vehicle warranty simply because you installed an aftermarket part unless they prove the component directly caused the failure in question. Consult your dealer for specifics.
• Q: What warranty does Kooks provide?
  A: Kooks products are backed by a limited lifetime warranty to the original purchaser against defects in materials and workmanship. Racing and competition use applications may have specific warranty exclusions. Contact Kooks Performance directly for warranty details.

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.