Upstream Downstream Oxygen O2 Sensor 234-4528 234-4529 - Direct Fit

In this review the 234-4528/234-4529 oxygen sensors are evaluated as direct replacements for 1.4L Chevy and Buick models. The bottom line: this pair is for DIY mechanics and independent shops that need a reliable, OEM-standard O2 sensor replacement without extra calibration steps. The reviewer found the sensors offer consistent functionality and straightforward installation, backed by the manufacturers 100% reliability testing process, making them a sensible buy when the original upstream or downstream sensor fails.

Key Features

• Direct replacement numbers: Supplied with the listed upstream and downstream replacement codes so users can match parts quickly for known applications.
• Wide vehicle fitment: Designed to fit multiple 1.4L engines including Chevy Cruze, Sonic, Trax and Buick Encore for model years stated, reducing the need to hunt for different part variants.
• OEM manufacturing process: Produced to OEM standards so the sensor matches original form and fit for straightforward swapping into the factory location.
• Full reliability testing: Each sensor is 100% tested to the same criteria used by original equipment manufacturers, which helps ensure consistent performance out of the box.
• After-sales support: The brand provides pre-sales consultation and technical support to help with compatibility and installation questions.

Who It's For

This product suits owners of Chevy Cruze (2011-2016 variants noted), Chevy Sonic (2012-2020), Chevy Trax (2013-2021) and Buick Encore (2013-2021) with 1.4L engines who need a direct upstream or downstream oxygen sensor replacement. It is aimed at people comfortable with basic underhood work or independent repair shops looking for a tested, OEM-style substitute for the original sensor.

It is less appropriate for drivers who require manufacturer-branded parts or dealer-level warranty service tied to dealer-installed components, or for vehicles outside the listed model years and 1.4L engine configuration where fitment is not guaranteed.

Pros & Cons

Pros

• Functionality is reliable thanks to 100% testing that mirrors OE criteria.
• Installation is generally easy and straightforward for users familiar with basic automotive repair.
• Good value compared with dealer parts while matching OEM form and fit for targeted models.

Cons

• Fit and value received mixed feedback from some customers, so confirm compatibility before purchase.
• Not the original dealer-branded part, which may matter for some under-warranty repairs.

Specifications

Part Numbers	Upstream 234-4529; Downstream 234-4528
Alternate Numbers	55569903, 55572993, 55572216, 55574136
Compatible Engines	1.4L 1364cc
Compatible Models	Chevy Cruze, Chevy Sonic, Chevy Trax, Buick Encore (model years listed)
Manufacturing Standard	Produced under OEM standards
Testing	100% reliability testing per OE criteria
Support	Pre-sales and technical after-sales service

Our Verdict

The 234-4528/234-4529 oxygen sensors are a practical, cost-conscious replacement for owners of the listed 1.4L Chevy and Buick vehicles who want an OEM-standard part that is easy to install and thoroughly tested. For those who need dealer-branded parts or have vehicles outside the fitment list, a different option may be better, but for routine O2 sensor failures this pair represents dependable performance and solid value.

Frequently Asked Questions

Will these sensors fit my 1.4L Cruze?
They are listed as compatible with 2011-2015 Chevy Cruze 1.4L and 2016 Cruze Limited 1.4L, but you should verify fitment for your exact year and trim before ordering.

Are these original equipment parts?
They are manufactured under OEM standards and tested to OE criteria, but they are supplied as replacement sensors rather than factory-branded dealer parts.

Do they require programming after installation?
No additional programming is typically required; these are direct-fit replacements intended to match the original sensor form and function.