TAUTOY O2 Oxygen Sensor Kit 4PCS — Upstream & Downstream Direct-Fit for GM

TAUTOY O2 Oxygen Sensor Up Downstream 4Pcs kit provides four direct-fit oxygen sensors (two upstream, two downstream) engineered to restore accurate air-fuel readings for compatible GM trucks and SUVs.

These four sensors include two upstream (pre-catalytic converter) and two downstream (post-catalytic converter) units engineered as replacement OE-style parts for a range of GM vehicles. Each sensor is matched to common OEM part numbers and arrives ready to plug in, helping simplify repairs without modifying wiring or exhaust components. The kit is backed by a one-year warranty and is intended for models including Cadillac Escalade, Chevy Avalanche, Silverado, Suburban, Tahoe, GMC Sierra, Yukon and Yukon XL from model years roughly 2008–2014 depending on engine.

Which vehicles and engines will these sensors fit?

The TAUTOY kit lists compatibility with many GM full-size trucks and SUVs. Fitment covers multiple engine sizes and both two- and four-wheel drive configurations across specified model years. Always verify your vehicle’s existing sensor positions and OEM part numbers before ordering.

• Common fits: Cadillac Escalade (2009–2014), Chevy Silverado 1500/2500/3500 (2008–2012), Tahoe and Suburban (2008–2013), GMC Sierra and Yukon series (2008–2014).
• Engine coverage includes 4.8L, 5.3L, 6.0L and 6.2L V8 variants where applicable.
• Replace part numbers such as 234-4668 (upstream) and 234-4256 (downstream) for accurate matching.

How do upstream and downstream sensors differ and why replace both?

Upstream sensors measure exhaust gases before the catalytic converter to aid engine control, while downstream sensors monitor converter efficiency after the catalyst. Replacing both upstream and downstream sensors ensures the engine control module receives reliable inputs and helps avoid false trouble codes and poor fuel trim diagnostics.

• Upstream sensors (x2) control air-fuel adjustments in real time.
• Downstream sensors (x2) verify catalytic converter performance.
• Installing a matched set reduces troubleshooting time and prevents mismatch errors.

Are these TAUTOY sensors easy to install and do they require modifications?

TAUTOY sensors are manufactured to match OE-style fitment and electrical connections, so installation is typically straightforward for anyone with basic mechanical skills and the right tools. No custom wiring or exhaust modification is required when the sensors match the OEM part numbers for your vehicle.

• Direct-fit connectors and thread sizes follow original equipment specifications.
• Installation usually requires an oxygen sensor socket, ratchet, and anti-seize on threads if reusing mounting holes.
• Professional installation is recommended if you’re unfamiliar with exhaust-system work.

What warranty and part-number coverage comes with the kit?

The kit includes a 1-year limited warranty that covers defects in materials and workmanship under normal use. The listing references numerous OEM cross numbers so you can confirm compatibility with the sensor IDs your vehicle requires.

• One-year warranty for peace of mind after purchase.
• Cross-references include 234-4668, 234-4256 and many additional OEM numbers for fit confirmation.
• Keep receipts and vehicle information for warranty support.

Who this is for: This TAUTOY four-piece O2 sensor kit is suited for DIY mechanics, independent shops, and fleet managers who need a complete upstream and downstream replacement set for GM trucks and SUVs from the late 2000s to early 2010s. Buy this kit if you want OE-style replacements that cover multiple sensor locations, reduce diagnostic time, and come with a one-year warranty.