When installing longtube headers on your Silverado or Sierra, the upstream O₂ sensors need to be relocated further downstream. Speed Engineering's 12" O₂ sensor extensions make that relocation simple — plug-and-play extensions that allow the O₂ sensors to be moved to the correct position without cutting or splicing any wiring.
Sold as a pair.
Features:
- 12" Length — Provides sufficient reach for upstream O₂ sensor relocation with longtube header installations
- Sold as a Pair — Both extensions included, one per bank
- No Cutting or Splicing Required — Direct plug-and-play fit for easy installation
- Compatible with 5.3L and 6.2L Engines
Vehicle Applications:
Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2016 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2017 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2018 Chevrolet Silverado 1500 (2WD/4WD) — 5.3L/6.2L
- 2019 Chevrolet Silverado 1500 Classic (2WD/4WD) — 5.3L/6.2L
GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2016 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2017 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2018 GMC Sierra 1500 (2WD/4WD) — 5.3L/6.2L
- 2019 GMC Sierra 1500 Classic (2WD/4WD) — 5.3L/6.2L
FAQ
Why do I need O₂ sensor extensions when installing longtube headers?
Longtube headers move the upstream O₂ sensor bungs further back from the cylinder head compared to factory manifolds. Without extensions, the factory O₂ sensor wiring is too short to reach the new bung location. These 12" extensions bridge that gap without any cutting or splicing.
How many extensions are included?
These are sold as a pair — one extension per bank, two total per set.
What vehicles are these extensions compatible with?
These extensions are compatible with 2016–2018 Chevrolet Silverado 1500 and GMC Sierra 1500, and the 2019 Silverado 1500 Classic and Sierra 1500 Classic, with 5.3L or 6.2L engines in both 2WD and 4WD configurations.
Are these compatible with both 2WD and 4WD models?
Yes. These extensions are compatible with both 2WD and 4WD configurations on all listed applications.
