TAUTOY O2 Oxygen Sensor Kit — Upstream 234-5055 & Downstream 234-4568 for Kia/Hyundai 1.6L (2012–2018) OEM-fit, Stainless Steel

These two TAUTOY oxygen sensors (234-5055 upstream and 234-4568 downstream) replace factory O2 sensors to restore accurate air–fuel monitoring on compatible Kia and Hyundai 1.6L vehicles.

If your check engine light indicates an O2 sensor fault or your engine is running roughly, swapping both upstream and downstream sensors at the same time helps ensure the engine computer receives correct oxygen readings. This TAUTOY kit includes one upstream and one downstream sensor engineered to match OEM fit and electrical connections, making it a direct-replacement option for many 2012–2018 Kia Rio and Soul and 2012–2017 Hyundai Accent and Veloster models with the 1.6L engine.

Which cars and part numbers does this TAUTOY kit fit?

The sensors are designed to pair with the factory harness and mounting locations used on certain Kia and Hyundai models with L4 1.6L engines. TAUTOY lists multiple OEM cross-reference numbers so you can confirm compatibility before purchase.

• Primary part numbers: 234-5055 (upstream) and 234-4568 (downstream).
• Common OEM cross-refs: 39210-03060, 39210-2B110, 392102B110 and others in the 39210-2Bxxx family.
• Typical fitment: Kia Rio & Soul (2012–2018) and Hyundai Accent & Veloster (2012–2017) with 1.6L engines.

How do these sensors affect engine performance and emissions?

Oxygen sensors monitor exhaust oxygen to help the engine control module adjust fuel delivery. Replacing worn or faulty sensors restores accurate feedback, which supports stable idle, efficient fuel use, and proper emissions control.

• Upstream sensor provides the primary air–fuel mixture reading.
• Downstream sensor helps verify catalytic converter efficiency.
• Accurate readings reduce rough idling and can improve fuel economy when failing sensors are replaced.

What features and build quality does the TAUTOY kit offer?

TAUTOY’s sensors use a stainless-steel housing and robust welds to resist exhaust heat and vibration. The wiring and connector are made to align with OEM configurations for a plug-and-play replacement in compatible vehicles.

• Materials: double laser-welded stainless steel body for durability.
• Sensor technology tuned for precise oxygen partial-pressure measurement.
• Includes two sensors (one upstream, one downstream) to replace both positions at once.
• Backed by a 1-year limited warranty from TAUTOY.

How should I install and test these oxygen sensors?

Installation is typically straightforward for a mechanic or a DIYer with basic tools: unplug the old sensor, remove it with an O2 sensor socket, fit the replacement, and reconnect the wiring. After installation, clearing stored engine codes and running the vehicle ensures the engine control module recognizes the new sensors and confirms proper operation.

• Recommended tools: O2 sensor socket, ratchet, penetrating oil if original sensor is seized.
• Clear any related trouble codes after replacement and monitor for reoccurrence.
• If codes persist, verify wiring, connector pinout, and heater circuit integrity.

Who is this for: This TAUTOY two-piece oxygen sensor kit is aimed at owners and technicians working on Kia Rio, Soul and Hyundai Accent, Veloster 1.6L models from the listed years who need direct-fit replacements. It suits drivers addressing O2-related trouble codes, seeking to restore proper fuel trim and emissions performance, or performing scheduled maintenance where replacing both upstream and downstream sensors at once is preferred.