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The Kooks oxygen sensor extension harnesses identified by manufacturer part number EX685-Z is supplied in the exact configuration described as O2 Extension Kit for 2014-2019 C7 Corvette. Confirm the complete part number, application, connection points, emissions requirements, and included components before ordering.
Key Features
- The kit includes both driver and passenger side extensions with correct length for Kooks header installations and no cutting or excess slack that could cause chafing.
- The significant improvement in exhaust flow changes air fuel ratios and requires ECM recalibration to achieve optimal power output and safe operation.
- 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.
Fitment
| Years | Make | Model | Application Notes |
|---|---|---|---|
| 2014-2019 | Chevrolet | Corvette | Verify engine, emissions equipment, transmission, and exhaust configuration |
Specifications
| Brand | Kooks Headers |
|---|---|
| Manufacturer Part Number | EX685-Z |
| Product Type | Oxygen Sensor Extension Harnesses |
| Material | Manufacturer-specified materials |
| Nominal Dimensions | Confirm exact part dimensions |
| Fitment Type | Vehicle Specific |
What's Included
- 1) 16" Rear Extension Harness (4-Pin)
- 1) 21" Rear Extension Harness (4-Pin)
About Kooks Headers
Kooks manufactures performance exhaust components in the United States, including headers, connection pipes, catalytic-converter assemblies, cat-back systems, mufflers, flanges, and installation hardware. Exact part-number verification is essential because similar-looking components can use different engine, chassis, emissions, and connection configurations.
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Frequently Asked Questions
Will this Kooks oxygen sensor extension harnesses fit my 2014-2019 Chevrolet Corvette?
That year, make, and model range is listed. Confirm the engine, emissions equipment, transmission, body configuration, existing exhaust, and exact Kooks part number before ordering.
Does this harness replace an oxygen sensor?
No. An extension harness changes connector reach for the specified installation and does not replace a failed oxygen sensor unless the exact product title states otherwise.
How should the harness be routed?
Keep it away from exhaust heat, sharp edges, moving parts, and tension. Secure the connectors and verify the wiring cannot contact the exhaust through the full range of movement.
Installation Instructions
- Verify the exact part number, application, emissions configuration, connection sizes, and package contents before disassembly.
- Support the vehicle safely and follow the factory service procedure together with the current Kooks instructions for this part number.
- Test-fit every component before cutting, welding, or permanently tightening the exhaust system.
- Route oxygen-sensor wiring and nearby hoses, lines, and cables away from heat, sharp edges, and moving parts.
- Torque fasteners in the specified sequence, inspect for leaks and clearance, and recheck accessible connections after initial heat cycles.
Chevrolet Corvette Parts & Accessories
Chevrolet Corvette parts and accessories for every generation are stocked at Black Ops Auto Works. Shop cold air intakes, catch cans, oil separators, cat-back and axle-back exhaust systems, valve-back systems, X-pipes, brake pads, brake rotors, brake ducts, big brake kits, sway bars, coilovers, carbon fiber hoods, splitters, spoilers, mirrors, lighting, and drivetrain parts for C5, C6, C7, and C8 Corvettes, including Stingray, Grand Sport, Z06, ZR1, and Z51 trims. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 1,476 Chevrolet Corvette SKUs across intake, exhaust, brakes, suspension, exterior, and drivetrain categories. What This Collection Covers The Corvette has moved through four modern generations since the C5 launched in 1997, and each one uses different engine architecture, chassis design, and body construction. This collection groups parts confirmed to fit the specific Co...
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Kooks Headers and Exhaust
Shop Kooks headers, connection pipes, catalytic-converter assemblies, cat-back systems, axle-back systems, mufflers, flanges, gaskets, oxygen-sensor extensions, and exhaust hardware by exact manufacturer part number and verified application. Confirm the complete vehicle, engine, emissions configuration, transmission, existing exhaust, and every connection requirement before ordering. Kooks Product Families Kooks manufactures long-tube and emissions-style headers, catted and non-catted connection pipes, GREEN catalytic-converter assemblies, complete exhaust systems, universal fabrication components, and supporting installation hardware. Choosing the Correct Kooks Part Match the complete Kooks manufacturer part number Confirm year, make, model, engine, transmission, body configuration, and factory exhaust equipment Verify collector, inlet, outlet, and tubing dimensions Review catalytic-converter and emissions requirements for the installation location Confirm whether gaskets, clamps...
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