ChawYI O2 Sensors for Chevy & Buick 234-4528/234-4529 Upstream & Downstream 1.4L Direct-Fit OEM-Tested

ChawYI 234-4528 (downstream) and 234-4529 (upstream) are direct-fit oxygen sensors designed to replace the factory O2 sensors on select Chevy and Buick 1.4L models.

These ChawYI oxygen sensors are built to match OEM form, fit and function for specific 1.4L engines used in Chevy Cruze, Sonic, Trax and the Buick Encore across listed model years. They carry equivalent replacement numbers (upstream: 234-4529 / 2344529 / 55569903 / 55572993; downstream: 234-4528 / 2344528 / 55572216 / 55574136) and are 100% tested to the same performance criteria used by original equipment manufacturers. The sensors come with factory-style connectors and harness lengths intended to make installation straightforward for a mechanic or an experienced DIYer.

Which vehicles and engines does this sensor fit?

These ChawYI O2 sensors fit 1.4L turbocharged engines in several GM compact models. Compatibility covers model years and trims listed below, but always verify fitment for your VIN or use the seller’s fit-check tool before purchase.

• Buick Encore 1.4L: 2013–2021
• Chevrolet Cruze 1.4L: 2011–2015 and Cruze Limited 2016 (Eco/LT/LTZ)
• Chevrolet Sonic 1.4L: 2012–2020
• Chevrolet Trax 1.4L: 2013–2021

How do upstream and downstream O2 sensors differ, and which part number do I need?

Upstream (pre-catalyst) sensors monitor exhaust oxygen content for fuel trim adjustments; downstream (post-catalyst) sensors monitor catalytic converter efficiency. Choosing the correct number depends on the sensor location on your vehicle’s exhaust system.

• Upstream replacement: 234-4529 / 2344529 / 55569903 / 55572993
• Downstream replacement: 234-4528 / 2344528 / 55572216 / 55574136
• Inspect the old sensor or consult service manual to confirm location before ordering

What quality and testing standards does ChawYI use for these sensors?

ChawYI manufactures these sensors under OEM-style processes and subjects each unit to full testing to match the acceptance criteria used by OE suppliers. That testing verifies electrical function, heater circuits and response characteristics so the unit performs predictably after installation.

• Produced to OEM form, fit and connector specifications
• 100% functional testing against OE performance benchmarks
• Designed to integrate with factory wiring and engine control systems

Can I install these O2 sensors myself, and what should I expect during replacement?

Installation is straightforward for someone with basic automotive tools and experience; upstream and downstream sensors use threaded ports and factory connectors. Allow time for the exhaust to cool, use the correct oxygen-sensor socket, and follow torque recommendations to avoid damage.

• Requires oxygen-sensor socket or open-ended wrench and possible penetrating oil for seized threads
• Ensure connector tabs fully engage and wiring is routed away from hot components
• After installation, clear any stored codes and verify proper engine operation

Who is this for: Drivers and professional technicians who need a reliable, OEM-form oxygen sensor replacement for certain GM 1.4L compact vehicles. Choose ChawYI 234-4528 or 234-4529 if you want a cost-effective, fully tested sensor compatible with the listed Chevy Cruze, Sonic, Trax and Buick Encore model years, and always confirm part numbers and fitment for your specific vehicle before ordering.