AULINK Oxygen Sensor 2-Pack Upstream & Downstream for 2009–2016 Hyundai/Kia 2.0L–2.4L, OEM Fit Stainless Steel

AULINK 2-pack upstream and downstream oxygen sensors (234-4238 & 234-5029) replace factory units on select 2.0L and 2.4L Hyundai and Kia models to restore accurate exhaust readings and improve engine management.

If your check engine light points to an O2 sensor or your vehicle shows rough idle, poor fuel economy, or failed emissions checks, replacing both upstream and downstream sensors with matched units is a dependable step. These AULINK sensors are designed to match OEM fit and electrical characteristics for many Hyundai and Kia 2.0L and 2.4L engines from model years 2009–2016, offering stainless steel housings, laser-welded construction, and protective venting that stops moisture entry while allowing atmospheric sensing.

Which vehicles and engines do these oxygen sensors fit?

These sensor pairings are built to directly replace original equipment on multiple Hyundai and Kia models with 2.0L or 2.4L L4 engines. Fitment covers upstream and downstream positions where the listed OEM part numbers apply.

• Hyundai Sonata (2009–2014) 2.4L L4
• Hyundai Santa Fe (2010–2012) 2.4L L4
• Hyundai Tucson (2010–2014) 2.0L / 2010–2014 2.4L L4
• Kia Forte5 (2012–2013), Optima (2011–2015) including Optima Hybrid (2011–2013), Rondo (2009–2012), Sorento (2011–2015), Sportage (2011–2016) 2.4L L4

How do these sensors match OEM quality and performance?

AULINK sensors use a stainless steel body and double laser-welded seams to resist corrosion and maintain a tight seal, replicating the durability and electrical behavior of factory parts. The design keeps moisture out while allowing proper air exchange for accurate oxygen measurement.

• Double laser-welded stainless steel housing for long-term durability
• Water-resistant venting prevents filter clogging while permitting atmospheric sensing
• Engineered to match OEM electrical characteristics and mounting dimensions

What benefits will you notice after installation?

Replacing both upstream and downstream sensors with matched AULINK units helps stabilize air-fuel mixture readings, which improves drivability and can recover fuel efficiency lost to failing sensors. It also reduces the chance of false fault codes and helps emissions systems operate correctly.

• More consistent engine idle and throttle response
• Improved fuel economy compared with deteriorated sensors
• Lower risk of recurring diagnostic trouble codes and failed emissions tests

Are there any warranty or part number details I should know?

Each pack includes two sensors with multiple cross-referenced OEM part numbers for easy verification. AULINK backs these sensors with a 1-year or 50,000 km warranty for added confidence after installation.

• Cross-referenced OEM numbers: 234-4238, 234-5029, 392102G100, 392102G200 and more
• Warranty: 1 year or 50,000 km coverage
• Sold as an upstream + downstream matched pair for reliable diagnostics

Who is this for: Automotive DIYers, maintenance shops, and vehicle owners who need a reliable OEM-compatible replacement for failing oxygen sensors on selected Hyundai and Kia 2.0L and 2.4L engines. Choose this AULINK 2-pack when you want corrosion-resistant construction, matched upstream/downstream performance, and a straightforward warranty for peace of mind during repairs or routine exhaust-system maintenance.