Walker 350-34074 Oxygen Sensor - Downstream or Downstream Front
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Walker
 Walker Products Aftermarket

Walker 350-34074 Oxygen Sensor - Downstream or Downstream Front

Brand Walker 350-34074
Position Downstream
Connector Gender Male
Connector Shape Radiused Polygon
Mounting Type Threaded
Overall Length 23.74
Sensor Type Heated
Thread Diameter 18.0
Universal Or Specific Fit Specific
Wire Gauge Measurement 20
Wire Quantity 4
Wiring Harness Length 20.2
Product line Walker Products Aftermarket
Fits Toyota and Lexus · 101 vehicles

OE replacement. Engineered as a direct-fit oxygen sensor for reliable ECU feedback.

Heated sensor. Helps the system reach operating temperature quickly for consistent readings.

Threaded mount. Installs with a secure, threaded connection.

$71.95Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.

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Step 2 — Quantity
Order total $71.95
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 350-34074 Oxygen Sensor for Toyota and Lexus

Walker Products 350-34074 is a specific-fit heated oxygen sensor engineered as an OE-style replacement for select Toyota and Lexus applications. It is built to deliver the diagnostic feedback the ECU expects, helping maintain proper fuel control and emissions monitoring on downstream positions.

Key Features

  • Heated oxygen sensor for downstream and downstream front locations
  • Specific-fit design with 4-wire configuration
  • Threaded mounting with 18.0 mm thread diameter
  • Radiused polygon male connector for application-specific fitment
  • 20.2 in. wiring harness length and 20-gauge wire
  • Overall length: 23.74 in.
  • OE replacement design for select Toyota Prius, Prius C, Prius V, Prius Plug-In, Highlander, Sienna, and Lexus CT200h and RX models

Detailed Description

Walker Products Aftermarket focuses on engine management and oxygen/air-fuel sensors built for exact vehicle applications. Part number 350-34074 is designed for specific fitment and the correct sensor position, including downstream bank 1 sensor 2 applications on select Toyota Prius, Prius C, Prius V, Prius Plug-In, and Lexus CT200h models, plus downstream front coverage on select Toyota Highlander, Sienna, RX350, and RX450h applications. This Walker 350-34074 oxygen sensor supports ECU feedback needed for emissions control and drivability on the listed vehicles.

Walker Products has supplied engine management components since 1946 and manufactures to automotive ISO 9001/TS 16949 standards. The brand line is centered on aftermarket replacement sensors and fuel system components for vehicles worldwide, with application-specific cataloging and fitment-focused design.

What It Helps Address

  • Check engine light related to oxygen sensor performance
  • Poor fuel economy caused by incorrect exhaust feedback
  • Rough engine operation tied to faulty downstream sensor data
  • Elevated exhaust emissions from inaccurate air-fuel monitoring
  • Stored ECU fault codes for the affected sensor circuit

Installation Notes and Tips

Verify the sensor position before ordering, since this part is listed for downstream and downstream front locations depending on the vehicle. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion before installation. Confirm the connector shape, wire count, and thread size match the original sensor on your Toyota Prius, Prius C, Prius V, Prius Plug-In, Highlander, Sienna, CT200h, RX350, or RX450h application.

  • Fits 2020-2021 Toyota Prius C, downstream
  • Fits 2012-2019 Toyota Prius C, downstream
  • Fits 2018 Toyota Prius V, downstream
  • Fits 2011-2017 Lexus CT200h, downstream
  • Fits 2012-2017 Toyota Prius V, downstream
  • Fits 2011-2016 Toyota Highlander, downstream front
  • Fits 2016 Toyota Sienna, downstream front
  • Fits 2015 Lexus RX350, downstream front
  • Fits 2011-2015 Lexus RX450h, downstream front
  • Fits 2010-2015 Toyota Prius, downstream
  • Fits 2015 Toyota Prius Plug-In, downstream
  • Fits 2015 Toyota Sienna, downstream front
  • Fits 2014 Lexus RX350, downstream front
  • Fits 2012-2014 Toyota Prius Plug-In, downstream

Quality Assurance

Walker Products manufactures this sensor as an OE replacement under its automotive ISO 9001/TS 16949 quality framework, with application-specific fitment and ECU feedback requirements in mind.

Related reading

This part fits 101 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelDrive TypeLitersCylindersFuel TypePositionNotes
2021ToyotaPrius C——1.5LL4—DownstreamOE Replacement
2020ToyotaPrius C——1.5LL4—DownstreamOE Replacement
2019ToyotaPrius CLE—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2019ToyotaPrius CL—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018ToyotaPrius CTwo—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018ToyotaPrius CThree—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018ToyotaPrius COne—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018ToyotaPrius CFour—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2018ToyotaPrius V——1.8LL4—DownstreamOE Replacement
2017LexusCT200h——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017ToyotaPrius CTwo—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017ToyotaPrius CThree—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017ToyotaPrius COne—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017ToyotaPrius CFour—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017ToyotaPrius VTwo—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017ToyotaPrius VThree—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017ToyotaPrius VFour—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2017ToyotaPrius VFive—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016LexusCT200h——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016ToyotaHighlanderXLE—3.5LV6GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2016ToyotaHighlanderLimited—3.5LV6GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2016ToyotaHighlanderLE—3.5LV6GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2016ToyotaHighlanderLE Plus—3.5LV6GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2016ToyotaHighlanderHybrid Limited—3.5LV6ELECTRIC/GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2016ToyotaPrius CTwo—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016ToyotaPrius CThree—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016ToyotaPrius CPersona Series—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016ToyotaPrius COne—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016ToyotaPrius CFour—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016ToyotaPrius VTwo—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016ToyotaPrius VThree—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016ToyotaPrius VFour—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016ToyotaPrius VFive—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2016ToyotaSiennaXLEAWD3.5LV6GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2016ToyotaSiennaLimitedAWD3.5LV6GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2016ToyotaSiennaLEAWD3.5LV6GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2015LexusCT200h——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015LexusRX350F Sport—3.5LV6GASDownstream FrontJapan Built Vehicle; Vehículo hecho en Japón; Downstream; Front; Walker Products Aftermarket
2015LexusRX350Base—3.5LV6GASDownstream FrontJapan Built Vehicle; Vehículo hecho en Japón; Downstream; Front; Walker Products Aftermarket
2015LexusRX350——3.5LV6GASDownstream FrontExc.Japan Built Vehicle; Excluye vehiculos construido en Japón; Downstream; Front; Walker Products Aftermarket
2015LexusRX350F Sport—3.5LV6GASDownstream FrontJapan Built Vehicle; Downstream; Front; Walker Products Aftermarket
2015LexusRX350Base—3.5LV6GASDownstream FrontJapan Built Vehicle; Downstream; Front; Walker Products Aftermarket
2015LexusRX350——3.5LV6GASDownstream FrontExc.Japan Built Vehicle; Downstream; Front; Walker Products Aftermarket
2015LexusRX450h——3.5LV6ELECTRIC/GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2015ToyotaHighlanderXLE—3.5LV6GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2015ToyotaHighlanderLimited—3.5LV6GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2015ToyotaHighlanderLE—3.5LV6GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2015ToyotaHighlanderLE Plus—3.5LV6GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2015ToyotaHighlanderHybrid Limited—3.5LV6ELECTRIC/GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2015ToyotaPriusTwo—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPriusThree—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPriusPersona Series—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPriusOne—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPriusFour—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPriusFive—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPrius CTwo—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPrius CThree—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPrius COne—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPrius CFour—1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPrius Plug-InBase—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPrius VTwo—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPrius VThree—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPrius VFour—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaPrius VFive—1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2015ToyotaSiennaXLEAWD3.5LV6GASDownstream FrontDel 09/2014; Downstream; Front; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaLimitedAWD3.5LV6GASDownstream FrontDel 09/2014; Downstream; Front; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaLEAWD3.5LV6GASDownstream FrontDel 09/2014; Downstream; Front; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaXLEAWD3.5LV6GASDownstream FrontDownstream; Front; From September 2014; Walker Products Aftermarket
2015ToyotaSiennaLimitedAWD3.5LV6GASDownstream FrontDownstream; Front; From September 2014; Walker Products Aftermarket
2015ToyotaSiennaLEAWD3.5LV6GASDownstream FrontDownstream; Front; From September 2014; Walker Products Aftermarket
2014LexusCT200h——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014LexusRX350——3.5LV6GASDownstream FrontExc.Japan Built Vehicle, From 03/2014; Excluye vehiculos construido en Japón, desde 03/2014; Downstream; Front; Walker Products Aftermarket
2014LexusRX350——3.5LV6GASDownstream FrontJapan Built Vehicle, From 03/2014; Vehículo hecho en Japón, Del 03/2014; Downstream; Front; Walker Products Aftermarket
2014LexusRX350——3.5LV6GASDownstream FrontExc.Japan Built Vehicle, From 03/2014; Downstream; Front; Walker Products Aftermarket
2014LexusRX350——3.5LV6GASDownstream FrontJapan Built Vehicle, From 03/2014; Downstream; Front; Walker Products Aftermarket
2014LexusRX450h——3.5LV6ELECTRIC/GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2014ToyotaHighlander——3.5LV6GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2014ToyotaHighlander——3.5LV6ELECTRIC/GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2014ToyotaPrius——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014ToyotaPrius C——1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2014ToyotaPrius Plug-In——1.8LL4—DownstreamOE Replacement
2014ToyotaPrius V——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2013LexusCT200h——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2013LexusRX450h——3.5LV6ELECTRIC/GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2013ToyotaHighlander——3.5LV6ELECTRIC/GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2013ToyotaPrius——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2013ToyotaPrius C——1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2013ToyotaPrius Plug-In——1.8LL4—DownstreamOE Replacement
2013ToyotaPrius V——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2012LexusCT200h——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2012LexusRX450h——3.5LV6ELECTRIC/GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2012ToyotaHighlander——3.5LV6ELECTRIC/GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2012ToyotaPrius——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2012ToyotaPrius C——1.5LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2012ToyotaPrius Plug-In——1.8LL4—DownstreamOE Replacement
2012ToyotaPrius V——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2011LexusCT200h——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2011LexusRX450h——3.5LV6ELECTRIC/GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2011ToyotaHighlander——3.5LV6ELECTRIC/GASDownstream FrontDownstream front oxygen sensor required.; Walker Products Aftermarket
2011ToyotaPrius——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket
2010ToyotaPrius——1.8LL4ELECTRIC/GASDownstreamFits downstream bank 1 sensor 2 on specific vehicle models.; Walker Products Aftermarket