will Denso 234-4209 Oxygen Sensor work for Toyota sienna

Amazon allows for a car's make, model, year, etc. to be entered at its site to find out if a particular part will fit that car or not. Please do so to find out if Denso 234-4209 oxygen sensor will fit your car.

It does come with a connecter? So I'm buying what exactly?

You have to cut the connector off the old part & splice the wires to the new O2 sensor. Part comes with wire crimp fittings.

Is this for upstream or downstream?

To answer your question correctly I would have to know the vehicle year, make, model to complete your request. Most O2 sensors are for the front or back with the wiring connector being different, so if you do not find a match by running your vehicle off the Amazon site call Auto-Zone or look on their site to confirm the correct number for the sensor. I will warn you that using any aftermarket sensor is not the same as OEM which means the milliamp output is not the same by the aftermarket part and may not clear the code in your vehicle.

What is the heating coil resistance? I installed on the car and got check engine code. Measure the heater resistance 29Ohms, that seems too high.

It is a bad reading on your part, or the sensor is bad

Denso Oxygen O2 Sensor 234 4209 Universal Sensor Without Connector

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Description

🛠️ Upgrade your ride’s brain with precision sensing power!

PRECISION OE QUALITY FIT - Guaranteed first-time fit for seamless installation across 100+ vehicle models.
BOOSTED ENGINE EFFICIENCY - Optimizes oxygen detection to improve fuel economy and engine power, reducing emissions.
ADVANCED SENSOR PROTECTION - Exclusive aluminum oxide trap shields against silicone & lead poisoning, extending sensor life.
HIGH TEMPERATURE DURABILITY - Stainless steel housing and porous Teflon filter withstand up to 800°C for long-lasting performance.
DIY FRIENDLY INSTALLATION KIT - Includes butt connectors, shrink tubing, and anti-seize compound—no extra parts needed, just crimp and go.

The Denso 234-4209 universal oxygen sensor delivers OE-level accuracy and durability with a stainless steel build and advanced aluminum oxide trap technology. Designed for over 100 vehicle models, it enhances engine performance and fuel efficiency while resisting contamination and extreme heat up to 800°C. Comes with a complete DIY installation kit (excluding connector) for a cost-effective, reliable upgrade that prevents premature sensor failure.

Specifications

ASIN	B000C5WCUE
Best Sellers Rank	#855,112 in Automotive ( See Top 100 in Automotive ) #4,894 in Automotive Replacement Oxygen Sensors
Brand	Denso
Brand Name	Denso
Customer Reviews	4.2 out of 5 stars 1,232 Reviews
Global Trade Identification Number	00042511142091
Included Components	Oxygen (O2) Sensor
Item Dimensions	5.75 x 2.19 x 1.88 inches
Item Type Name	Oxygen Sensor
Item Weight	0.25 Pounds
Item dimensions L x W x H	5.75 x 2.19 x 1.88 inches
Manufacturer	Denso
Material	Stainless Steel, Zirconium
Material Type	Stainless Steel, Zirconium
Maximum Supply Voltage	12 Volts
Model	234-4209
Mounting Type	Thread-In
Output Type	electrical signal
Part Number	234-4209
Smart Home Compatibility	Not Smart Home Compatible
Specific Uses For Product	Replacement Oxygen (O2) Sensor
Style	Replacement Part
Style Name	Replacement Part
UPC	042511142091
Unit Count	1.0 Count
Upper Temperature Rating	800 Degrees Celsius
Warranty Description	Includes manufacturer provided warranty

Reviews

L**.

11.03.2024

N**T

22.09.2012

C**W

22.06.2013

J**.

22.01.2026

E**N

12.09.2015

W**E

30.05.2011

D**N

2.10.2011

S**S

12.01.2018

A**R

24.07.2025

B**K

17.01.2026

A**.

5.01.2022

C**B

4.02.2023

L**.

19.02.2024

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Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

€ 81.80

Duties & taxes included

In stock

Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Portugal.

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Denso Oxygen (O2) Sensor - 234-4209 (Universal Sensor Without Connector)

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