Installation Time
(approx) 15 Minutes
Difficulty Level:
Simple installation for anyone.
Installation Guides
No guide available for this part yet.
FREE 1 to 3-Day Delivery on Orders $149+ Details
O2 Oxygen Sensor Extension Wire Harness; Downstream (15-19 Sierra 2500 HD)Find parts that fit my vehicle
Item HG48099
Our Price
$39.99 each
Military, Medical & First Responders
$2.00 Available in AT Cash Rewards.
Confirm Eligibility
Confirm Eligibility
CONFIRM THIS FITS YOUR VEHICLE!
Saved - View your saved items
We're sorry. We couldn't save this product at this time.
or use
Shop Owners Save More!
Sign up for our dealer program
Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features
- 15" Rear Oxygen Sensor O2 Harness for C7 Z06, Corvette, Camaro, LT1, LT4, LT5 Gen V Silverado
- Replaces OEM Part 12655678
- Set of Two Oxygen Sensor Extensions for Rear O2 Sensors on C7 Vehicles
- 15" Long Harnesses
- Compatible with Gen 5 GM Applications Including 2014+ Camaro, Silverado, Suburban, and Other Trucks
- Designed for Aftermarket Headers That Relocate Oxygen Sensor Bungs
- Eliminates the Need to Cut and Splice Factory Wiring
- Fits 2015-2019 Sierra 2500 HD Models
Description
O2 Sensor Extension Harness. The O2 Oxygen Sensor Extension Wire Harness; Downstream is designed to extend the rear oxygen sensor wiring to facilitate easy installation when aftermarket headers reposition sensor locations. It helps preserve factory wiring integrity by providing additional length and eliminating the need to cut or splice original harnesses, ensuring reliable sensor connections and optimal engine performance.
Construction and Appearance. Built with durable wiring and quality connectors, the harness features a 15-inch length to suit various aftermarket setups. The wiring is insulated to withstand heat and environmental exposure commonly found under the vehicle, ensuring longevity and consistent performance in demanding automotive conditions.
Installation. Installation is simple and requires no drilling or modifications to existing components. The harness plugs inline with the factory sensor wiring and aftermarket oxygen sensors for a straightforward upgrade.
Application. Designed to fit 2015-2019 Sierra 2500 HD models without modifications or exclusions.
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Installation & What's in the Box
Installation Info
What's in the Box
- (1) O2 Oxygen Sensor Extension Wire Harness
4.7
Customer Reviews (3)
Questions & Answers
No questions about this product yet.
Ask the First Question
