TAUTOY O2 Oxygen Sensor Kit 4-Pc Upstream & Downstream for GM V6/V8 2008-2014 — Direct-Fit, Matched Set

TAUTOY O2 Oxygen Sensor Up Downstream 4Pcs is a four-piece sensor kit (two upstream, two downstream) engineered to restore accurate oxygen readings for compatible GM V8 and V6 engines.

This TAUTOY kit replaces worn or failing oxygen sensors on a range of GM trucks and SUVs, delivering reliable lambda feedback to the engine management system. The set includes two upstream (pre-catalyst) sensors and two downstream (post-catalyst) sensors, matched to many OEM part numbers for direct-fit replacements. Each sensor is built to meet fit, form, and function expectations and comes with a one-year warranty for added confidence.

Which vehicles and engines does this kit fit?

The TAUTOY 4-piece O2 sensor set covers a broad list of GM models from 2008–2014 when equipped with the specified engine sizes. It fits Cadillac Escalade, Chevy Avalanche, Silverado, Suburban, Tahoe and GMC Sierra, Yukon and Yukon XL across multiple model years and displacement options. Verify your exact model year and engine code against the listed fitment before purchase.

• Cadillac Escalade 2009–2014 (including ESV/EXT 6.2L models)
• Chevrolet Avalanche 2008–2013 (5.3L, 6.0L), Silverado 1500/2500/3500 (2008–2013)
• Chevrolet Suburban and Tahoe, and GMC Sierra, Yukon, Yukon XL across specified years
• Check engine displacement (4.8L, 5.3L, 6.0L, 6.2L) and model year for compatibility

How do these upstream and downstream sensors differ, and why both matter?

Upstream sensors measure oxygen content in exhaust gases before the catalytic converter so the ECU can control air-fuel ratio. Downstream sensors sit after the catalytic converter to monitor converter efficiency and detect performance issues. Replacing both sensor types in a set ensures the engine control system receives consistent, balanced feedback from both positions.

• Upstream (pre-cat): two sensors included for accurate fuel trim adjustments
• Downstream (post-cat): two sensors included to verify catalyst performance
• Replaces failing sensors that trigger check-engine lights or poor fuel economy
• Sold as a matched set to avoid cross-compatibility issues

What OEM part numbers and compatibility references does this kit cover?

The TAUTOY set is cross-referenced to a wide range of OEM numbers so it can replace many factory sensors without modification. This list helps ensure you’re ordering the correct replacement for your vehicle when compared to the part number on the original sensor. Always compare the connector style and thread pitch in addition to part numbers for a guaranteed fit.

• Common cross-references include 234-4668, 234-4256 and multiple GM part numbers
• Also referenced to long lists like 12559849, 12561777, 12567497 and others
• Compatible with many ES2xxx and 21x/213-series OEM references
• Verify your vehicle’s original sensor number or consult fitment guide

What warranty and quality expectations come with the TAUTOY kit?

Each TAUTOY 4-piece O2 sensor kit includes a one-year warranty that covers defects in materials and workmanship. Sensors are manufactured to meet fit and performance standards suitable for replacement use, though they are not OEM parts. The warranty provides short-term protection while you confirm fit and initial operation after installation.

• 1-year limited warranty included with the kit
• Sold as a full four-sensor set for upstream and downstream positions
• Engineered for direct-fit replacement on listed GM vehicles
• Installation by a qualified technician recommended

Who is this for: The TAUTOY O2 Oxygen Sensor Up Downstream 4Pcs kit is designed for owners and mechanics who need a complete sensor replacement for GM trucks and SUVs from 2008–2014. Choose this kit if your vehicle shows oxygen-sensor-related diagnostic codes, has reduced fuel efficiency, or if you are replacing sensors proactively during exhaust or catalytic converter service. Verify fitment with your vehicle’s year, engine size, and OEM part number before ordering.