Walker 350-34587 Oxygen Sensor - Downstream Rear
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 Walker Products Aftermarket

Walker 350-34587 Oxygen Sensor - Downstream Rear

Brand Walker 350-34587
Position Downstream Rear
Connector Gender Male
Connector Shape Radiused Polygon
Mounting Type Threaded
Overall Length 21.77
Sensor Type Heated
Thread Diameter 18.0
Universal Or Specific Fit Specific
Wire Gauge Measurement 20
Wire Quantity 4
Wiring Harness Length 18.23
Product line Walker Products Aftermarket
Fits Toyota · 31 vehicles

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

Heated sensor. Provides faster feedback for the engine management system.

Threaded mount. Installs with a secure, threaded connection.

$55.21Free shipping
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Walker 350-34587 Oxygen Sensor for Toyota Sienna

Walker Products 350-34587 is a heated oxygen sensor built as a specific-fit OE replacement for select Toyota Sienna applications. It is engineered to deliver the ECU feedback needed for downstream rear monitoring on covered vehicles, helping maintain proper fuel control and emissions system operation.

Key Features

  • Heated oxygen sensor for downstream rear placement
  • Specific-fit design for direct application matching
  • 18.0 mm thread diameter with threaded mounting
  • 4-wire configuration with 20-gauge wiring
  • Radiused polygon male connector for vehicle-specific connection
  • Wiring harness length: 18.23 in.; overall length: 21.77 in.

Application Details

This Walker Products Aftermarket sensor is part number 350-34587 and is intended for Toyota Sienna models with downstream rear oxygen sensor placement. It fits 2004-2010 Toyota Sienna, downstream rear, and 2015-2016 Toyota Sienna, downstream rear, including the 2015 models noted from 09/2014. Walker Products designs this engine management and oxygen/air-fuel sensor line as an OE-style replacement for vehicles worldwide, with application-specific fitment and ECU feedback requirements in mind.

This part cross-references no listed interchange numbers for the same application.

What It Helps Address

  • Check engine light related to oxygen sensor performance
  • Poor engine operation caused by inaccurate exhaust feedback
  • Increased fuel consumption from incorrect air-fuel correction
  • Higher exhaust emissions from a failing downstream sensor
  • Fault codes stored in the ECU for the affected sensor circuit

Installation Notes and Tips

Confirm the sensor is installed in the correct downstream rear position before replacement. Inspect the sensor, wiring harness, and connector for physical damage, since damaged components can shorten service life and affect signal quality. Verify thread size, connector shape, and wire count against the original part before installation on Toyota Sienna models.

Quality Assurance

Walker Products is an automotive ISO 9001/TS 16949 certified company with a long history in engine management and fuel system components. The 350-34587 oxygen sensor is manufactured for specific vehicle applications and built to provide the diagnostic feedback expected by the ECU.

Related reading

This part fits 31 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelSubmodelDrive TypeLitersCylindersFuel TypePositionNotes
2016ToyotaSiennaXLEFWD3.5LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2016ToyotaSiennaXLEAWD3.5LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2016ToyotaSiennaSE—3.5LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2016ToyotaSiennaLimitedFWD3.5LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2016ToyotaSiennaLimitedAWD3.5LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2016ToyotaSiennaLEFWD3.5LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2016ToyotaSiennaLEAWD3.5LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2016ToyotaSiennaL—3.5LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2015ToyotaSiennaXLEFWD3.5LV6GASDownstream RearDel 09/2014; Downstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaXLEAWD3.5LV6GASDownstream RearDel 09/2014; Downstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaSE—3.5LV6GASDownstream RearDel 09/2014; Downstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaLimitedFWD3.5LV6GASDownstream RearDel 09/2014; Downstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaLimitedAWD3.5LV6GASDownstream RearDel 09/2014; Downstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaLEFWD3.5LV6GASDownstream RearDel 09/2014; Downstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaLEAWD3.5LV6GASDownstream RearDel 09/2014; Downstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaL—3.5LV6GASDownstream RearDel 09/2014; Downstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaXLEFWD3.5LV6GASDownstream RearDownstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaXLEAWD3.5LV6GASDownstream RearDownstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaSE—3.5LV6GASDownstream RearDownstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaLimitedFWD3.5LV6GASDownstream RearDownstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaLimitedAWD3.5LV6GASDownstream RearDownstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaLEFWD3.5LV6GASDownstream RearDownstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaLEAWD3.5LV6GASDownstream RearDownstream; Rear; From 09/2014; Walker Products Aftermarket
2015ToyotaSiennaL—3.5LV6GASDownstream RearDownstream; Rear; From 09/2014; Walker Products Aftermarket
2010ToyotaSienna——3.5LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2009ToyotaSienna——3.5LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2008ToyotaSienna——3.5LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2007ToyotaSienna——3.5LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2006ToyotaSienna——3.3LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2005ToyotaSienna——3.3LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket
2004ToyotaSienna——3.3LV6GASDownstream RearRear downstream oxygen sensor must be installed in correct position.; Walker Products Aftermarket