TAUTOY O2 Oxygen Sensor 2-Pack for 1.4L Buick/Chevy — Upstream & Downstream, Stainless Steel

TAUTOY O2 Oxygen Sensor 2-pack replaces upstream and downstream sensors for 1.4L Buick Encore and multiple Chevy models to restore accurate air-fuel sensing and emissions monitoring.

These two TAUTOY oxygen sensors—one upstream and one downstream—are engineered as direct-fit replacements for a range of 1.4L Buick and Chevrolet vehicles. Built with a double laser-welded stainless steel housing and advanced sensing technology, they measure oxygen partial pressure to help the engine control module maintain the intended air-fuel ratio. Each set includes both required sensors and arrives backed by a one-year warranty for peace of mind.

Will these sensors fit my car model?

They are made to match factory fit and function for many 1.4L GM vehicles produced across several model years. Confirm compatibility by matching OEM part numbers or checking the vehicle fit list.

• Compatible models: 2013–2021 Buick Encore 1.4L
• Chevrolet coverage: 2011–2015 Cruze 1.4L (Eco/LT/LTZ), 2016 Cruze Limited 1.4L, 2012–2020 Sonic 1.4L, 2013–2021 Trax 1.4L
• OEM references included: 234-4529, 234-4528, 2344529, 2344528, 55569903, 55572993, 55572216, 55574136

How do these two sensors differ and why do you get both?

The upstream (pre-catalyst) sensor provides rapid oxygen readings that the engine computer uses for real-time fuel trimming. The downstream (post-catalyst) sensor monitors converter efficiency and emissions performance. Selling them as a matched pair ensures synchronized sensing behavior and simplifies a repair that often requires replacing both units.

• Upstream sensor: fast-response for air-fuel adjustments
• Downstream sensor: verifies catalytic converter operation
• Pairing reduces diagnostic mismatch and future check-engine triggers

What materials and construction improve reliability?

TAUTOY sensors use a stainless steel body with double laser welding for corrosion resistance and a secure seal around the sensing element. Advanced internal components measure oxygen partial pressure precisely, which helps the ECU maintain optimal fuel delivery and engine drivability.

• Double laser-welded stainless steel housing for durability
• High-precision sensing element for accurate oxygen measurement
• Designed to meet OEM electrical connectors and mounting

What about warranty and installation guidance?

Each two-piece set is backed by a one-year limited warranty covering defects in materials and workmanship. Installation is straightforward for a trained technician; always verify connector type and torque specifications, and clear codes after replacement to confirm proper operation.

• 1-year limited warranty included with purchase
• OEM part numbers supplied to confirm fitment before install
• Recommended: professional installation and post-replacement code reset

Who is this for: The TAUTOY O2 Oxygen Sensor 2-pack is aimed at DIYers, independent mechanics, and fleet technicians who need a reliable, direct-fit upstream and downstream sensor solution for 1.4L Buick Encore and compatible Chevy models. It’s intended for anyone replacing failed sensors, resolving emissions-related check-engine lights, or restoring proper air-fuel feedback after exhaust or catalytic work.