Walker 350-34630 Oxygen Sensor - Downstream
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 Walker Products Aftermarket

Walker 350-34630 Oxygen Sensor - Downstream

Brand Walker 350-34630
Position Downstream
Connector Gender Male
Connector Shape Radiused Polygon
Mounting Type Threaded
Overall Length 24.72
Sensor Type Heated
Thread Diameter 18.0
Universal Or Specific Fit Specific
Wire Gauge Measurement 20
Wire Quantity 4
Wiring Harness Length 21.18
Product line Walker Products Aftermarket
Fits Kia and Hyundai · 114 vehicles

OE replacement. Engineered as an original-equipment-style oxygen sensor replacement.

Heated sensor. Helps deliver faster feedback to the engine management system.

Threaded mount. Installs with a secure, direct-fit threaded design.

$54.86Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
Order total $54.86
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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Walker Oxygen Sensor for Downstream Applications

Walker Products 350-34630 is a heated oxygen sensor built as an OE-style replacement for specific downstream applications. It is engineered for vehicles that rely on accurate ECU feedback to manage fuel delivery and emissions performance.

Compatible With Hyundai Santa Fe Sport, Kia Optima, Kia Sportage, Hyundai Sonata, Hyundai Tucson, Kia Sorento, Hyundai Genesis Coupe, Hyundai ix35, Hyundai Santa Fe, Kia Forte, Kia Forte Koup, and Hyundai Santa Fe Sport downstream positions across select 2009-2016 models.

Key Features

  • Part number: 350-34630
  • Heated oxygen sensor design
  • Specific fit for the listed downstream applications
  • 4-wire configuration with 20-gauge wiring
  • Threaded mounting with 18.0 mm thread diameter
  • Radiused polygon male connector for vehicle-specific connection
  • Wiring harness length: 21.18 in.
  • Overall length: 24.72 in.

Product Details

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors developed as OE replacement parts for a wide range of vehicles. This sensor is built for the downstream Bank 1 Sensor 2 position on the listed Hyundai and Kia applications, where the ECU depends on stable signal feedback to monitor exhaust system performance. If the original sensor is aging or damaged, the vehicle may store fault codes and show drivability or emissions-related symptoms. Walker Products 350-34630 is a direct-fit replacement for the specified applications, including Hyundai Sonata, Hyundai Tucson, Kia Optima, and Kia Sportage models in the fitment list.

What It Can Help Address

  • Check engine light related to downstream oxygen sensor faults
  • Poor fuel economy caused by inaccurate exhaust feedback
  • Elevated exhaust emissions from a failing sensor
  • Rough engine operation tied to incorrect ECU input
  • Fault codes associated with Bank 1 Sensor 2 monitoring

Installation Notes and Tips

Confirm the vehicle’s year, make, model, and downstream Bank 1 Sensor 2 location before installation. Inspect the sensor connector, wiring harness, and surrounding exhaust components for heat damage, corrosion, or physical wear before replacing the part. Because this is a threaded sensor, proper removal and installation technique helps prevent thread damage and ensures a secure seal.

Quality Assurance

Walker Products has supplied engine management components since 1946 and operates with Automotive ISO9001/TS 16949 certification. The 350-34630 is manufactured for the specified application and fitment position to provide the ECU feedback required by the vehicle’s emissions control system.

Related reading

This part fits 114 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelTransmissionLitersCylindersFuel TypePositionNotes
2016HyundaiSanta Fe Sport——2.4LL4—DownstreamB1S2; OE Replacement
2016KiaOptimaHybrid—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016KiaOptimaHybrid EX—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016KiaSportage——2.4LL4—DownstreamB1S2; OE Replacement
2015Hyundaiix35——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015HyundaiSanta Fe Sport——2.4LL4—DownstreamB1S2; OE Replacement
2015HyundaiSonataHybrid—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015HyundaiSonataHybrid Limited—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015HyundaiTucsonSE—2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015HyundaiTucsonLimited—2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015KiaOptimaSX—2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015KiaOptimaLX—2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015KiaOptimaHybrid LX—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015KiaOptimaHybrid EX—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015KiaOptimaEX—2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015KiaSorento——2.4LL4—DownstreamB1S2; OE Replacement
2015KiaSportage——2.4LL4—DownstreamB1S2; OE Replacement
2014HyundaiGenesis Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014HyundaiSanta Fe Sport——2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014HyundaiSonataHybrid—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014HyundaiTucson——2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014HyundaiTucson——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014KiaOptima——2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014KiaOptima——2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014KiaSorento——2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014KiaSportage——2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2013HyundaiGenesis Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2013HyundaiSanta Fe Sport——2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2013HyundaiSonataHybrid—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2013HyundaiTucson—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2013HyundaiTucson——2.0LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2013HyundaiTucson—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2013HyundaiTucson——2.0LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2013KiaForte—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2013KiaForte—Automatic2.0LL4GASDownstreamCalif-ESV , A/T; B1S2; Downstream; Walker Products Aftermarket
2013KiaForte—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2013KiaForte—Automatic2.0LL4GASDownstreamCalif-ESV , A/T; Downstream; B1S2; Walker Products Aftermarket
2013KiaForte Koup—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2013KiaForte Koup—Automatic2.0LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2013KiaForte Koup—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2013KiaForte Koup—Automatic2.0LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2013KiaOptimaHybrid—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2013KiaOptima—Automatic2.4LL4—DownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2013KiaOptima—Automatic2.4LL4—DownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2013KiaSorento——2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2013KiaSportage—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2013KiaSportage—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2012HyundaiGenesis Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2012HyundaiSanta Fe——2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2012HyundaiSonataHybrid—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2012HyundaiTucson—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2012HyundaiTucson——2.0LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2012HyundaiTucson—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2012HyundaiTucson——2.0LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2012KiaForte—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2012KiaForte—Automatic2.0LL4—DownstreamCalif-ESV, A/T; B1S2; Downstream; Walker Products Aftermarket
2012KiaForte—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2012KiaForte—Automatic2.0LL4—DownstreamCalif-ESV, A/T; Downstream; B1S2; Walker Products Aftermarket
2012KiaForte Koup—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2012KiaForte Koup—Automatic2.0LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2012KiaForte Koup—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2012KiaForte Koup—Automatic2.0LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2012KiaOptimaHybrid—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2012KiaOptima—Automatic2.4LL4—DownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2012KiaOptima—Automatic2.4LL4—DownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2012KiaSorento——2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2012KiaSportage—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2012KiaSportage—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2011HyundaiGenesis Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2011HyundaiSanta Fe——2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2011HyundaiSonataHybrid—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2011HyundaiSonata—Manual2.4LL4GASDownstreamFrom 3/21/2011; B1S2; Del 3/21/2011; Downstream; Walker Products Aftermarket
2011HyundaiSonata—Automatic2.4LL4GASDownstreamCalif-ESV; From 3/21/2011; B1S2; Calif-ESV; Del 3/21/2011; Downstream; Walker Products Aftermarket
2011HyundaiSonata—Automatic2.4LL4GASDownstreamNon Calif-ESV; From 3/21/2011; B1S2; No Calif-ESV; Del 3/21/2011; Downstream; Walker Products Aftermarket
2011HyundaiSonata—Manual2.4LL4GASDownstreamFrom 3/21/2011; Del 3/21/2011; Downstream; B1S2; Walker Products Aftermarket
2011HyundaiSonata—Automatic2.4LL4GASDownstreamCalif-ESV; From 3/21/2011; Calif-ESV; Del 3/21/2011; Downstream; B1S2; Walker Products Aftermarket
2011HyundaiSonata—Automatic2.4LL4GASDownstreamNon Calif-ESV; From 3/21/2011; No Calif-ESV; Del 3/21/2011; Downstream; B1S2; Walker Products Aftermarket
2011HyundaiSonata—Manual2.4LL4GASDownstreamFrom 3/21/2011; B1S2; Downstream; Walker Products Aftermarket
2011HyundaiSonata—Automatic2.4LL4GASDownstreamCalif-ESV; From 3/21/2011; B1S2; Downstream; Walker Products Aftermarket
2011HyundaiSonata—Automatic2.4LL4GASDownstreamNon Calif-ESV; From 3/21/2011; B1S2; Downstream; Walker Products Aftermarket
2011HyundaiTucson—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2011HyundaiTucson——2.0LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2011HyundaiTucson—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2011HyundaiTucson——2.0LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2011KiaForte—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2011KiaForte—Automatic2.0LL4GASDownstreamCalif-ESV , A/T; B1S2; Downstream; Walker Products Aftermarket
2011KiaForte—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2011KiaForte—Automatic2.0LL4GASDownstreamCalif-ESV , A/T; Downstream; B1S2; Walker Products Aftermarket
2011KiaForte Koup—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2011KiaForte Koup—Automatic2.0LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2011KiaForte Koup—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2011KiaForte Koup—Automatic2.0LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2011KiaOptimaHybrid—2.4LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2011KiaOptima—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2011KiaOptima—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2011KiaSorento——2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2011KiaSportage—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2011KiaSportage—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2010HyundaiGenesis Coupe——2.0LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2010HyundaiSanta Fe——2.4LL4GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2010HyundaiSonata——2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2010HyundaiSonata——2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2010HyundaiTucson—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2010HyundaiTucson—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2010KiaForte—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2010KiaForte—Automatic2.0LL4GASDownstreamCalif-ESV , A/T; B1S2; Downstream; Walker Products Aftermarket
2010KiaForte—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2010KiaForte—Automatic2.0LL4GASDownstreamCalif-ESV , A/T; Downstream; B1S2; Walker Products Aftermarket
2010KiaForte Koup—Automatic2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2010KiaForte Koup—Automatic2.0LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2010KiaForte Koup—Automatic2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2010KiaForte Koup—Automatic2.0LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket
2009HyundaiSonata——2.4LL4GASDownstreamDownstream oxygen sensor for B1S2 position in California emissions.; Walker Products Aftermarket
2009HyundaiSonata——2.4LL4GASDownstreamDownstream oxygen sensor compatible with California-ESV vehicles in bank 1 position 2.; Walker Products Aftermarket