HTMXJA Oxygen Sensor Kit 2-Piece Upstream & Downstream for 2012–2018 Accent/Rio/Soul 2.4L — OEM Fit, Corrosion-Resistant

Two HTMXJA oxygen sensors—one upstream (234-5055) and one downstream (234-4568)—designed to restore accurate O2 readings and support optimal engine performance on compatible 2012–2017 Accent, 2012–2018 Rio, Veloster and 2012–2016 Soul 2.4L vehicles.

If your vehicle shows a check-engine light related to oxygen sensors or you want to replace aging sensors for steadier fuel trim and emissions monitoring, this HTMXJA 2-piece set provides direct-fit replacements built to OEM specifications. Each sensor is crafted from corrosion-resistant materials and supplied with the correct reference numbers so you can match fitment quickly. The kit includes both the upstream sensor (pre-catalyst, part 234-5055) and the downstream sensor (post-catalyst, part 234-4568) to address both measurement and catalytic converter monitoring needs.

How will these HTMXJA sensors affect my vehicle’s fuel performance?

Fresh oxygen sensors help the engine control module (ECM) adjust air-fuel mixture more precisely, which can stabilize idle and improve fuel economy compared with badly aging sensors. Replacing both upstream and downstream sensors ensures accurate feedback for both combustion tuning and emissions verification.

• Upstream sensor provides real-time exhaust oxygen readings to the ECM.
• Downstream sensor verifies catalytic converter efficiency.
• New sensors can reduce incorrect fuel trims caused by failing units.

Are these sensors easy to install and do they match OEM specs?

Yes—the HTMXJA parts are manufactured to match OEM lengths and connector types for a straightforward replacement without modifications. Basic hand tools and an oxygen sensor socket are typically all that’s needed, and the package notes fitment for model years and engine type to help you confirm compatibility before purchase.

• Upstream: OE reference 234-5055; downstream: OE reference 234-4568.
• Direct-fit design aimed at bolt-in replacement with existing wiring harnesses.
• Installation typically requires no cutting, splicing, or special adapters.

Which models and engine does this 2-pack fit?

This HTMXJA oxygen sensor pair is intended for 2.4L L4 engines in specific Hyundai and Kia models across the listed years. Always verify your vehicle’s engine displacement and sensor length against the listed reference part numbers before ordering to ensure a correct match.

• Hyundai Accent: 2012–2017 L4-2.4L compatibility.
• Kia Rio: 2012–2018 L4-2.4L compatibility.
• Kia Soul: 2012–2016 L4-2.4L compatibility (also applicable to select Veloster variants).

What should I know about durability and warranty?

HTMXJA builds these sensors from materials intended for harsh under-hood conditions and corrosion resistance, but expected life can vary with driving patterns and environment. The product includes a six-month warranty; confirm sensor length and connector fit before installation to avoid returns.

• Constructed with corrosion-resistant housings for extended service life.
• Six-month limited warranty included with purchase.
• Follow fitment guidance and verify reference numbers to prevent fitment issues.

Who is this for? This HTMXJA 2-piece oxygen sensor set is aimed at DIYers and professional mechanics replacing faulty O2 sensors on compatible 2.4L L4 Hyundai and Kia models. It’s suited for owners troubleshooting emissions-related codes, improving fuel-trim accuracy, or restoring catalytic converter monitoring—anyone needing an affordable, OEM-referenced upstream and downstream pair that installs with standard tools.