Denso 234-4946 Oxygen Sensor - Downstream or Downstream Left
OE Quality 60-Day Returns
Denso
 OE Style

Denso 234-4946 Oxygen Sensor - Downstream or Downstream Left

Brand Denso 234-4946
Position Downstream and Downstream Left
Wiring Harness Length 23.62
Sensor Type Heated
Universal Or Specific Fit Specific
Wire Quantity 4
Product line OE Style
Fits Toyota · 2 vehicles

OE style. Precision-built for exact replacement and a first-time fit.

Heated sensor. Helps deliver faster response and stable operation.

Aluminum oxide trap layer. Protects the ceramic element from silicone and lead contamination.

Cross-references NTK 24787, Toyota 8946508150 and Walker Products 250-241191 for the same application. See all 4.

$83.30Free shipping
In stock · usually ships same day before 1pm CST
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OE-Style Oxygen Sensor for Toyota Sienna

This Denso OE Style oxygen sensor is built for direct replacement on select Toyota Sienna applications. It is a heated, specific-fit sensor engineered to match the original mounting and electrical requirements for a precise repair.

For 2015-2016 Toyota Sienna models, Denso 234-4946 supports downstream oxygen sensor replacement with OE-style fitment and wiring length designed for the application.

Key Features

  • Heated oxygen sensor for downstream exhaust monitoring
  • Specific-fit design for direct replacement
  • 4-wire configuration
  • 23.62 in. wiring harness length
  • OE Style construction for factory-style fit and function
  • Built and tested to OE standards

Product Details

Denso 234-4946 is part of the OE Style line, which focuses on factory-matched replacement sensors for accurate fitment and dependable signal performance. The sensor uses Denso’s aluminum oxide trap layer to help protect the ceramic element from silicone and lead contamination, supporting stable operation in the exhaust stream. This makes it a practical replacement choice for Toyota Sienna owners addressing downstream sensor faults while maintaining original equipment-style integration.

This part cross-references Toyota 8946508150 and NTK 24787 for the same application.

What It Helps Fix

  • Check engine light related to downstream oxygen sensor faults
  • Incorrect air-fuel feedback from a worn sensor
  • Reduced fuel economy caused by inaccurate exhaust readings
  • Failed emissions inspection tied to sensor performance
  • Rough or inconsistent engine operation from degraded sensor output

Installation Notes

Fits 2016 Toyota Sienna, Downstream Left. Fits 2015 Toyota Sienna, Downstream, from 09/2014. Confirm connector style, wire routing, and exhaust location before installation. Use the vehicle’s original sensor position and verify the harness length matches the factory routing on the Toyota Sienna.

Quality Assurance

Denso manufactures and tests this oxygen sensor to strict OE standards for replacement accuracy and consistent performance. The OE Style line is designed to deliver the right part and the right fit for the listed Toyota Sienna applications.

Related reading

This part fits 2 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelDrive TypePositionNotes
2016ToyotaSiennaFWDDownstream LeftOE Style
2015ToyotaSiennaFWDDownstreamFrom 09/2014; OE Style
Directly replaces or cross-references 4 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
NTK — 24787Toyota — 8946508150Walker Products — 250-241191Walker Products — 350-341005