Will this fit my Toyota Prius?

It is listed for select Toyota and Lexus applications, including the Prius, Highlander, CT200h and RX350. Confirm your model year and engine, and check that the original sensor is a 4-wire downstream unit with a male connector.

Is this an upstream or downstream sensor?

Denso lists the 234-4400 for downstream positions, including downstream left, right and front where specified. Do not use it in place of an upstream sensor.

Does it replace Bosch 18018 or NTK 24834?

Yes. Denso cross-references this part to Bosch 18018 and NTK 24834, along with Bosch 18039 and Delphi ES20410, for the same application.

Do I need to splice the wiring?

No. It comes with a 22.32-inch harness and a male connector made for the factory plug, so it installs as a direct replacement rather than a universal splice-in sensor.

What does the aluminum oxide trap layer do?

It protects the ceramic sensing element from silicone and lead contamination, which can shorten sensor life and skew readings.

Will it clear my check engine light?

It addresses codes caused by a worn or failed downstream oxygen sensor. If the code comes from a different fault, such as a wiring or catalytic converter issue, replacing the sensor will not fix it.

Where is the Denso 234-4400 Oxygen Sensor cheapest?

At eBay, for $34.60, 73% under what the other stores charge, as of our latest check.

What do buyers say about the Denso 234-4400 Oxygen Sensor?

Rated 2.5 out of 5 from 4 ratings.

Where can I buy the Denso 234-4400 Oxygen Sensor?

17 stores we checked sell it, including Amazon, eBay, Partsgeek.com, Newparts.com, SparkPlugs.com Family.

Denso 234-4400 Oxygen Sensor Price History: $34.60 at eBay

From PartCatalog

OE style replacement built for exact replacement and a first-time fit
Heated sensor helps support faster operation and efficient engine performance
Specific-fit design with a male connector and 4-wire harness
Threaded mounting type for OE-style installation
Aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination
Cross-references Bosch 18018, Bosch 18039, Delphi ES20410, NTK 24834 and others

Fit: Specific fit; downstream left, downstream right, downstream front and downstream positions
Sizing: Verify the exact year, make, model and sensor position before ordering; confirm connector style, wire count and thread size match the original sensor
Guarantee: Guaranteed fit for your vehicle when fitment is verified
Returns: Free returns within 60 days if it doesn't fit when fitment is verified; free return shipping
Shipping: Free shipping to the continental U.S.; in stock, usually ships same day before 1pm CST

About the Denso 234-4400 Oxygen Sensor

The Denso 234-4400 is an OE-style heated oxygen sensor for specific-fit replacement on select Toyota and Lexus vehicles. It installs in downstream positions, including downstream left, downstream right and downstream front where listed. It is built to match the factory fit for direct installation.

The sensor has a 4-wire harness with a male connector and a threaded, flange-style mount. An aluminum oxide trap layer helps protect the ceramic element from silicone and lead contamination. The heated sensor supports exhaust feedback for drivability and emissions performance.

Listed applications include the Toyota Prius, Prius V, Highlander and Sienna, and the Lexus CT200h, RX350 and RX450h. Before ordering, verify the year, make, model and sensor position. Confirm that the connector style, wire count and thread size match the original sensor. After installation, clear diagnostic trouble codes and confirm the sensor works properly.

Brand: Denso
Part number: 234-4400
Style: OE style, direct fit
Sensor type: Heated
Position: Downstream (left, right, front where listed)
Wires: 4 wire leads
Connector: Male
Wire harness length: 22.32 in (566.9 mm)
Thread diameter: 0.71 in (18 mm)
Mounting type: Flange mount, screw installation
Output type: Electric
Max temperature: 800 °C
Color: Black
Size: 1.880
Cross-references: Bosch 18018, Bosch 18039, Delphi ES20410, NTK 24834 and others
Fits: Toyota Prius, Prius V, Highlander, Sienna; Lexus CT200h, RX350, RX450h