NewYall Oxygen Sensor Kit for Kia/Hyundai 1.6L L4 — Upstream & Downstream Pair (234-5055/234-4568) OEM-fit

NewYall L4 1.6L upstream and downstream oxygen sensor kit replaces faulty O2 sensors for Kia Rio, Soul and Hyundai Accent, Veloster model years 2012–2015 to restore accurate air-fuel monitoring.

This NewYall OEM-fit oxygen sensor pair is engineered specifically for L4 1.6L engines in selected Kia and Hyundai models. It includes both upstream (pre-catalyst) and downstream (post-catalyst) sensors with the compatible part numbers 234-5055 and 234-4568, so you can replace worn or failing sensors without guessing which unit you need. Each sensor is manufactured and tested to meet fitment and electrical specifications for direct installation where those part numbers apply.

Which vehicles and engines are these sensors designed for?

These oxygen sensors are made only for the 1.6L L4 engines listed; they do not fit other displacements or engine types. Confirm your vehicle year and engine code before purchase to ensure compatibility.

• Compatible Kia models: Rio (2012–2014), Soul (2012–2015)
• Compatible Hyundai models: Accent (2012–2014), Veloster (2012–2014)
• Engine: L4 1.6L ONLY — verify under-hood label or VIN engine code

How do upstream and downstream sensors differ and why replace both?

The upstream sensor measures exhaust oxygen before the catalytic converter to help the engine control unit tune fuel delivery. The downstream sensor monitors catalytic converter efficiency. Replacing both ensures reliable readings and helps the ECU maintain correct air-fuel ratios.

• Upstream (234-5055): primary air-fuel feedback sensor
• Downstream (234-4568): catalyst performance monitor
• Replacing both reduces mismatched readings and diagnostic trouble codes (DTCs)

What should I expect during installation and fitment?

These sensors are designed for direct, bolt-in replacement using factory connectors and threads. Basic mechanical skills are sufficient; typical steps include lifting the vehicle, locating each sensor, disconnecting the electrical connector, unscrewing the old sensor, and torquing the new sensor to spec.

• Direct-fit connectors and thread sizes for 1.6L L4 applications
• Standard oxygen sensor socket or 22mm wrench required
• Torque to manufacturer specification and use anti-seize where appropriate

What performance or maintenance benefits will I see after replacement?

Replacing failing oxygen sensors improves engine management accuracy and reduces the chance of check-engine lights caused by sensor faults. While not a guarantee of fuel economy changes, fresh sensors provide the ECU the correct data it needs to adjust combustion and emissions control systems.

• Restores accurate air-fuel measurements for the ECU
• Helps prevent false diagnostic trouble codes related to O2 sensors
• Supports emissions system monitoring and catalytic converter checks

Who is this for: This NewYall sensor kit is aimed at DIY mechanics, independent repair shops, and vehicle owners who need OEM-compatible oxygen sensors for Kia Rio, Soul or Hyundai Accent, Veloster with the 1.6L L4 engine from the specified years. It’s not suitable for other engines or model years, so verify your vehicle’s engine size and part numbers before ordering.