FRONEZER 2PCS Oxygen Sensor 234-4528/234-4529 — Upstream & Downstream Sensor Set for Chevy Cruze/Sonic/Trax & Buick Encore

Upgrade your GM 1.4L engine sensors with FRONEZER

If you notice rough idling, uneven acceleration, or shifts in exhaust behavior, a reliable oxygen sensor can help your engine breathe more cleanly. FRONEZER’s 2PCS Oxygen Sensor set provides upstream and downstream coverage designed to fit a range of 1.4L GM models, combining durable materials with precise sensing to support smooth operation over time.

This pair is built to support compatibility across multiple models, including the Chevy Cruze, Sonic, Trax, and Buick Encore. The sensors work together to monitor exhaust oxygen levels, a critical part of how your engine determines the air-fuel mix during different driving conditions. While benefits vary by vehicle and driving style, the sensors are designed to offer dependable sensing and long-lasting performance.

Fitment you can rely on

The Upstream sensor is matched to 234-4529, while the Downstream sensor carries 234-4528. This duo is intended for the following models: 2011-2016 Chevy Cruze 1.4L Eco / LT / LTZ; 2012-2020 Chevy Sonic 1.4L; 2013-2021 Chevy Trax 1.4L; and 2013-2021 Buick Encore 1.4L. Note that some 1.4L engines within these families use different configurations; please refer to the main image for detailed fitment notes.

• Upstream: 234-4529
• Downstream: 234-4528

Premium build for lasting performance

Each sensor features a robust stainless steel exterior with a ceramic sensing element. This combination provides resistance to heat and corrosion, helping extend service life in typical driving environments and under varying exhaust temperatures.

• Heat resistant and corrosion protected
• Durable, long-lasting construction for daily driving and more demanding use

Precise detection for better engine management

Accurate measurement of exhaust oxygen helps the vehicle’s ECU tune the air-fuel ratio. The result can be smoother idling, steadier acceleration, and more consistent engine response across conditions, without implying guaranteed outcomes.

• Accurate sensing supports balanced air-fuel tuning
• Potential for more predictable performance and efficiency under real-world use

Real-world use and installation notes

Ideal for drivers performing routine maintenance or sensor replacement on compatible GM models. Benefits described here reflect the sensor’s sensing quality and durable construction, not a promise of specific results. Always verify fitment using the main image and model year details before installation.