QIYBONE O2 Sensor 2-Pack Upstream & Downstream for 1.4L Buick/Chevy — OEM Fit Stainless Steel

Two QIYBONE oxygen sensors (upstream 234-4529 and downstream 234-4528) built to match OEM fitment for select 1.4L Buick and Chevrolet models, restoring accurate air–fuel readings and stable engine operation.

These replacement oxygen (O2) sensors are made by QIYBONE to meet the electrical and dimensional specifications of the original equipment on many 1.4L L4 GM vehicles. Constructed with stainless steel housings and heat-resistant internals, the pair includes the upstream sensor (part 234-4529) that monitors pre‑catalytic converter exhaust, and the downstream sensor (part 234-4528) that checks catalyst efficiency. They are supplied with the common GM connector style so you can compare plugs and install quickly.

Which vehicles will these QIYBONE oxygen sensors fit?

These sensors are intended for a range of 1.4L L4 Buick and Chevrolet models across several model years. Confirm fit by checking your vehicle year, engine size (1.4L L4) and the original part number before ordering.

• Compatible: 2011–2015 Chevrolet Cruze (1.4L L4 Eco/LT/LTZ), 2016 Cruze Limited (1.4L)
• Compatible: 2012–2020 Chevrolet Sonic (1.4L L4 LS/LT/LTZ/Premier/RS)
• Compatible: 2013–2021 Chevrolet Trax (1.4L L4 LS/LT/LTZ/Premier) – note exclusions for certain 2021 engines
• Compatible: 2013–2021 Buick Encore (1.4L base/CX/CXL/Premier) with specific exclusions for some 2017 engines

How do these sensors affect fuel efficiency and engine performance?

Oxygen sensors provide the engine control unit with continuous information about the exhaust’s oxygen content so fuel delivery can be adjusted. Properly functioning sensors help maintain efficient combustion, reducing wasted fuel and helping the catalytic converter operate correctly.

• Upstream sensor measures exhaust before the catalytic converter for air–fuel adjustments.
• Downstream sensor monitors converter performance to detect catalyst inefficiency.
• Faster, accurate sensor response helps stabilize idle and throttle response.

What are the key construction and durability features of the QIYBONE pair?

QIYBONE oxygen sensors are built with corrosion-resistant stainless steel housings and high-temperature materials to withstand harsh exhaust conditions. Sealing and protective coatings reduce exposure to contaminants and extend service life under typical driving loads.

• Stainless steel body for rust resistance and mechanical strength.
• High-temperature internal components to tolerate exhaust heat cycles.
• Reinforced sealing to prevent exhaust leakage and protect wiring.

How easy is the installation and how do I confirm I'm ordering the right parts?

These sensors are manufactured to OEM-style specifications and use a common GM connector configuration for straightforward replacement. Installation usually requires basic hand tools and can be completed in minutes once the original sensor location and connection are accessed.

• Compare the original sensor part numbers (234-4529 upstream, 234-4528 downstream) with the listings on your vehicle.
• Check the plug shape and pin count against your factory harness to confirm compatibility.
• Replace sensors one at a time, using anti-seize where appropriate and torquing to factory specs.

Who this pair is for: mechanics, DIY enthusiasts and fleet owners who need a cost-effective, OEM-compatible replacement oxygen sensor set for 1.4L Buick Encore and Chevrolet Sonic/Trax/Cruze models. Choose QIYBONE if you want a stainless-steel, heat-resistant sensor pair that matches common GM part numbers (234-4529 upstream and 234-4528 downstream) and is intended to restore accurate air–fuel monitoring and catalytic converter feedback. Always verify vehicle year, engine code and original part number before purchase to ensure fitment.