TLYZSCGKZY Oxygen Sensor 2-Pack — Upstream & Downstream OEM-Style Fit for Kia/Hyundai 2012-2018 1.6L

Two OEM-style oxygen sensors (upstream and downstream) engineered to replace worn O2 units on 2012–2018 Kia Soul/Rio and 2012–2017 Hyundai Accent/Veloster 1.6L 4-cylinder engines.

If your vehicle is showing reduced fuel economy, hesitation, rough idle, or a Check Engine Light related to oxygen sensor codes, replacing both the upstream (pre-catalyst) and downstream (post-catalyst) sensors is a common repair. This TLYZSCGKZY 2-piece set is designed to directly substitute the factory sensors (replacing part numbers such as 39210-2B210 / 234-5055 and 39210-2B220 / 234-4568), restoring accurate air–fuel mixture readings and helping the engine management system correct fuel trim.

Which models and years will these sensors fit?

These oxygen sensors are built for specific 1.6L 4-cylinder Kia and Hyundai platforms. Confirm plug shape and connector location against your vehicle listing before purchase to ensure proper fitment.

• Fits: Kia Soul, Kia Rio (2012–2018) 1.6L L4
• Fits: Hyundai Accent, Hyundai Veloster (2012–2017) 1.6L L4
• Replaces factory codes: upstream 39210-2B210 / 234-5055 and downstream 39210-2B220 / 234-4568
• Check vehicle compatibility section at the top of the page before ordering

How do these sensors affect engine performance and fuel economy?

Oxygen sensors provide the ECU with exhaust oxygen measurements so it can adjust injector timing and fuel quantity. New, functioning sensors give more accurate data, which helps maintain stable idling, sharper throttle response, and better fuel efficiency compared with failing sensors.

• Upstream sensor monitors combustion for immediate fuel trim corrections
• Downstream sensor monitors catalytic converter efficiency
• Accurate readings prevent long-term damage from incorrect fuel mixtures
• Can reduce rough idle and improve fuel consumption when both sensors are replaced

What should I expect during installation and testing?

These sensors are manufactured to match factory interface points for a straightforward swap. Installation generally requires basic hand tools and a sensor socket; post-install, the vehicle’s ECU may need a short drive cycle to clear fault codes and re-learn operating parameters.

• Plug-and-play electrical connector and factory-style thread size
• Typical install time: 30–90 minutes depending on access and rust
• Use penetrating oil on seized fittings; torque to manufacturer spec
• After install, clear codes and perform a few driving cycles to confirm operation

Are these sensors durable and tested for reliability?

The set is constructed from durable materials and undergoes functional testing to ensure it delivers consistent oxygen readings across expected operating conditions. While quality controls aim to match factory performance, real-world longevity can vary with driving conditions and exposure to contaminants.

• Engineered materials resist exhaust heat and corrosion
• Bench-tested to confirm signal response and heater circuit integrity
• Replacing both sensors together helps ensure balanced monitoring
• Follow vehicle maintenance recommendations to prolong sensor life

Who is this for: This two-piece oxygen sensor kit is intended for DIY mechanics, independent repair shops, and vehicle owners who need a direct-fit replacement for the upstream and downstream O2 sensors on 2012–2018 Kia Soul and Rio or 2012–2017 Hyundai Accent and Veloster models with the 1.6L L4 engine. If your car is showing O2-related fault codes, poor fuel economy, or catalytic efficiency warnings, this set provides a cost-effective option to restore accurate exhaust sensing—just confirm compatibility with your vehicle before purchasing.