TAUTOY O2 Oxygen Sensor 4-Pack for GM Trucks SUVs (2008–2014) — Upstream & Downstream Set, Direct-Fit

TAUTOY 4-pack oxygen sensors (234-4668 upstream x2, 234-4256 downstream x2) replace faulty O2 sensors on compatible GM V8/V6 trucks and SUVs to restore accurate air-fuel monitoring and emissions performance.

These four direct-replacement oxygen sensors from TAUTOY are designed to match the fit and connector style of many 2008–2014 General Motors vehicles, including Cadillac Escalade, Chevrolet Silverado/Avalanche/Suburban, and GMC Sierra/Yukon models. The kit contains two upstream (pre-catalyst) and two downstream (post-catalyst) sensors so you can service a full bank of cylinders or replace failing sensors in pairs. Every sensor is cross-referenced to numerous OEM part numbers to simplify selection and reduce shopping errors.

Which vehicles and engines will these O2 sensors fit?

The TAUTOY sensors are aimed at a broad range of GM full-size trucks and SUVs from model years roughly 2008–2014. Fitment depends on engine size and model year; the listing covers multiple engine displacements and both standard and extended-length body variants.

• Cadillac Escalade (2009–2014) including ESV/EXT with 6.2L engines.
• Chevrolet Avalanche (2008–2013) and Silverado 1500/2500/3500 across 4.8L–6.2L variants.
• Suburban, Tahoe, GMC Sierra, Yukon and Yukon XL across specified years and engines — check your OEM part number for exact match.

How do these sensors improve vehicle operation after replacement?

Replacing worn O2 sensors helps the engine computer get accurate exhaust oxygen readings so it can calibrate fuel delivery and catalytic converter efficiency. That improves idle stability and helps the vehicle maintain expected emissions behavior, especially when downstream sensors have degraded.

• Restores accurate air-fuel ratio feedback to the engine control module (ECM).
• Helps the ECM optimize fuel trims and ignition timing for smoother running.
• Ensures catalytic converter monitoring by replacing degraded downstream sensors.

What should I know about installation and compatibility checks?

Installation is straightforward for mechanically experienced DIYers or professional technicians; sensors thread into the exhaust and connect to the factory wiring harness. Always verify the part cross-reference or your vehicle’s OEM part number before purchase to ensure exact match for your application.

• Each sensor uses the factory-style connector for plug-and-play replacement.
• Thread anti-seize may be applied to the threads — avoid contaminating the sensing tip.
• Torque to manufacturer spec and clear any stored diagnostic trouble codes after replacement.

What kind of warranty and part references are provided?

TAUTOY backs these oxygen sensors with a one-year warranty to cover manufacturing defects. The product listing includes an extensive set of OEM and cross-reference numbers to help you confirm correct fitment prior to installation.

• 1-year limited warranty against defects.
• Comprehensive OEM cross-reference list included in the product information.
• Sold as a set of four: two upstream (234-4668) and two downstream (234-4256) sensors.

Who is this for: This TAUTOY 4-piece oxygen sensor kit is intended for owners and technicians who need to replace multiple failed O2 sensors on GM full-size trucks and SUVs from the 2008–2014 era. It’s best suited for drivers addressing check-engine codes related to oxygen sensors or catalytic efficiency, fleet maintenance shops replacing sensors in matched sets, and DIYers who prefer to replace both upstream and downstream sensors at once to restore consistent exhaust sensing.