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Denso 234-9001 Upstream Air Fuel Ratio Oxygen Sensor with 10.6” 4-Wire Harness, for Auto Trans Equipped Vehicles

Brand: Denso

4.6 786 ratings

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Amazon's Choice in Automotive Replacement Oxygen Sensors by Denso

$134.95

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Purchase options and add-ons

Brand	Denso
Material	Zirconium
Item Weight	3.2 ounces
Style	Modern
Mounting Type	Flange Mount

About this item

Denso "first time fit" planar air fuel sensor, original equipment direct plug in, no wire cutting
Sample Image Provided May Differ From Actual Product
Features zirconia solid electrolyte
Highly accurate

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Denso 234-9001 Upstream Air Fuel Ratio Oxygen Sensor with 10.6” 4-Wire Harness, for Auto Trans Equipped Vehicles

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Product Description

DENSO REPLACEMENT OXYGEN SENSOR, FRONT -- Front OE Type, Original Replacement Oxygen Sensor, Direct Fit, 1 Required Per Vehicle, Sold Individually

Location: Front

Product information

Technical Details

Brand

‎Denso

Material

‎Zirconium

Item Weight

‎3.2 ounces

Style

‎Modern

Mounting Type

‎Flange Mount

Specific Uses For Product

‎Time

Manufacturer

‎Denso Sales Californ

Item model number

‎234-9001

Is Discontinued By Manufacturer

‎No

Manufacturer Part Number

‎234-9001

OEM Part Number

‎234-9001

Additional Information

ASIN

B000C5WD2Q

Customer Reviews

4.6 786 ratings

4.6 out of 5 stars

Best Sellers Rank

#83,281 in Automotive (See Top 100 in Automotive)
#203 in Automotive Replacement Oxygen Sensors

Date First Available

January 2, 2007

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.

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	This Item Denso 234-9001 Upstream Air Fuel Ratio Oxygen Sensor with 10.6” 4-Wire Harness, for Auto Trans Equipped Vehicles	Recommendations Marsflex O2 Oxygen Air Fuel Ratio Sensor 234-9002 Upstream Compatible with Toyota 4Runner 2.4L 2.7L 3.4L Tacoma 2.4L 3.4L Replacment 89467-35010…	dummy Denso 234-9021 Upstream Heated Oxygen Sensor with 4-Wire Plug and 14.17â€ Harness	dummy Denso 234-9002 Air Fuel Ratio Sensor	dummy Germban 234-9001 Air Fuel Ratio O2 Oxygen Sensor Upstream Fits for 4Runner 2.7L-L4 Tundra Tacoma 3.4L-V6 2000-2004 89467-35060	dummy 234-4162 234-4153 234-4154 234-4205 Oxygen O2 Sensor Upstream Downstream Compatible with Toyota Tacoma 4Runner Pickup T100 1996-2000，2344162 2344205 2344153 2344154
	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart	Try again! Details Added to Cart
Price	$134.95	$36.99	-31% $127.99 List: $186.27	-26% $152.45 List: $204.95	$56.99	$22.99
Delivery	Get it May 8 - 13	Get it as soon as Saturday, May 11	Get it as soon as Saturday, May 11	Get it as soon as Saturday, May 11	—	Get it as soon as Saturday, May 11
Customer Ratings	4.6786	4.02,981	4.5937	4.6690	4.253	4.3150
Easy to install	4.7	4.1	4.5	4.7	5.0	4.1
Value for money	4.4	3.5	4.4	4.4	5.0	3.9
Mileage	4.4	3.1	4.3	4.4	—	—
Sold By	Newparts	Marsflex	Amazon.com	Amazon.com	Germban Automotive	TAMKKEN
specific uses	Time	—	Oxygen Sensor	—	Oxygen Sensor	Time
material	Zirconium	—	Zirconium	Zirconium	—	—
mounting type	Flange Mount	Flange Mount	Threaded	Flange Mount	—	Flange Mount
style	Modern	Upstream	Modern	Durable	Modern	Modern
weight	0.2 pounds	—	0.26 pounds	0.26 pounds	0.15 kilograms	—

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Customer reviews

4.6 out of 5

786 global ratings

How customer reviews and ratings work

Customers say

Customers like the quality, ease of installation, value, fit and check engine light of the electronic sensor. For example, they mention it works well, is easy to install and the price is good. Some appreciate the performance.

AI-generated from the text of customer reviews

138 customers mention129 positive9 negative

Customers are satisfied with the quality of the electronic sensor. They say it works well, is of superior quality, and is a perfect OEM replacement. Some customers also mention that the sensor is likely fine and feels strong.

"...Comes with new gasket. No issues so far." Read more

"...Used PB Blaster to help loosen EXTREMELY rusty nuts; this product works wonderfully (just use latex gloves)...." Read more

"Works well and is fairly straight forward to install on a 2004 Tundra...." Read more

"...Anyway, this product is a direct replacement for the original part, and it includes the gasket as well...." Read more

86 customers mention83 positive3 negative

Customers find the installation of the electronic sensor to be easy and straightforward. They say it's easy to remove and replace the old sensor, and that it comes with a new gasket.

"Pretty simple to remove old and install new one. Comes with new gasket. No issues so far." Read more

"...Its that easy. Make sure the car isn't warm or hot. You could burn yourself down there...." Read more

"Works well and is fairly straight forward to install on a 2004 Tundra...." Read more

"...Overall, it is a very easy job that took me no more than 20 mins...." Read more

76 customers mention73 positive3 negative

Customers are satisfied with the value of the electronic sensor. They mention that it has an extremely good price, it saved them a few bucks, and that it is the least expensive sensor they have found.

"...Great price here at Amazon, I saved $80 buying it here than the local auto parts." Read more

"Great price and the correct part for my 2002 V6 Tacoma. No more P1135 codes since replacing the original 19 year old sensor." Read more

"Performing as expected. Truck runs a lot better now. I also saved a lot of money compared to the local auto parts store...." Read more

"...Extremely good price." Read more

74 customers mention71 positive3 negative

Customers are satisfied with the fit of the electronic sensor. They mention that it fits perfectly, and is easy to install. Some customers also say that it saves them hundreds of dollars.

"Item works well and as intended. Direct fit to my 2002 Toyota Tacoma 4 cyl...." Read more

"What I like abought this sensor is the exact fit and not too hard to put in or take out...." Read more

"Perfect fit on my 2002 V6 Tundra 4x4 with AT. Spray the two 12mm nuts a few days prior to make sure they come off easier...." Read more

"Almost perfect fit...." Read more

38 customers mention31 positive7 negative

Customers like the check engine light sensor. For example, they mention it's easy to install and fixes the issue. Some say the light went off immediately after installation.

"...after that, smooth sailing and no annoying light. Thanks Amazon and other reviewers! go Tacos!" Read more

"...10 minutes total, no more check engine light." Read more

"...The check engine light went out, and my fuel economy went up about 2 miles per gallon. I used this for my 2001 Toyota Tundra with the 3.4 liter V6...." Read more

"...It took me about 20 min to install, now engine check light is gone and saved a lot. Thank you to all previous reviews which helped a lot...." Read more

22 customers mention22 positive0 negative

Customers are satisfied with the performance of the electronic sensor. They mention that it improves the performance and engine power of their vehicles. Some customers also report that the engine light is now off and they are getting better gas mileage.

"...Installed it, cleared the code with scan tool. Engine ran much smoother immediately. Performance was also improved immediately as well...." Read more

"...took me about 20 min to install, now engine check light is gone and saved a lot. Thank you to all previous reviews which helped a lot...." Read more

"This made my truck run even smoother, i cant even tell that its running!..." Read more

"...I change the sensor the check engine light went off and my truck runs like a champion...." Read more

10 customers mention0 positive10 negative

Customers are dissatisfied with the length of the electronic sensor. For example, they mention the cable is too short.

"...The only reason that it does not fit is because the cables are 5 inches too short...." Read more

"...(too short)...." Read more

"...Mine has a 5 speed manual transmission, and the wiring harness is too short to reach for the manual transmissions...." Read more

"...with the installation went as expected, except the electrical cable is shorter than the one I pulled off, so I had to break a clip to get it..." Read more

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Chad

Fits 2003 toyota tacoma 3.4 4x4 with auto transmission

Reviewed in the United States on February 12, 2024

Verified Purchase

Pretty simple to remove old and install new one. Comes with new gasket. No issues so far.

Helpful

Texas Bigfoot

Good price on Amazon

Reviewed in the United States on August 5, 2013

Verified Purchase

1) Amazon has the best price I could find anywhere for this product
2) installed it on a 2002 Toyota Tacoma 3.4L V-6 4WD Double Cab Automatic; upstream sensor (right after the engine, before the two catalytic converters). Location is readily visible if you crawl under the truck on the passenger side, right after where the exhaust pipes from either side of the engine come together on the underside of the truck.
3) Used PB Blaster to help loosen EXTREMELY rusty nuts; this product works wonderfully (just use latex gloves).
4) 12mm nuts, was able to reach them with a deep socket - the socket is the only tool needed for this repair (you don't need an oxygen sensor wrench)
5) Used Permatex Anti-seize lubricant on the threads when placing the nuts back on to tighten the air/fuel sensor to the exhaust pipe - 14 ft lbs of torque for the nuts (the threads are the two bolts permanently mounted to the flange on either side of the air/fuel sensor). Permatex is a very good product which has a temperature range of -60°F to 1600°F (-51°Cto 871°C) and is salt, corrosion and moisture resistant.
6) disconnected the battery before doing the repair (remember to disconnect the NEGATIVE side of the battery).
7) the electrical connection has four wires; the two black wires can be checked with an ohm meter (open/OL/high resistance is bad, should be 11-16 ohms). I used a 10mm socket to remove the bolt for the metal support for the female side of the connector; the connector has a rocker-arm on top which locks it in place - mine was pretty hard to press down so removing the bolt allowed me to get a better grip on it, made the repair much easier.
8) The gasket should be oriented with the part having the most white facing toward the exhaust pipe
9) DON'T TOUCH THE SENSOR TO ANYTHING at all when you install it - prevent grease/oil/lubricants from getting on it
10) the error code I had was p1135 - P1135 A/F Sensor Heater Circuit Malfunction (Bank #1 Sensor #1); my truck only has two sensors, one upstream (before the catalytic converters) and one downstream (after the two catalytic converters but before the muffler).
11) I am having to install the downstream (rear) sensor as it failed 3 days after I installed the upstream sensor. Glad I ordered them both at the same time! The downstream sensor required me to buy a new intermediate pipe (WALKER Part # 53398) as the old pipe had rusted out where the oxygen sensor gets attached to the flange on the pipe. A perfect place to find all the parts to your exhaust is rockauto(dot)com, look under exhaust>pipe and click on the blue square with white lettering that says "info"

Hope this helps someone out there!

103 people found this helpful

Helpful

Jon

2004 Tacoma, double cab 3.4L prerunner

Reviewed in the United States on June 2, 2013

Verified Purchase

Few months of driving around with the annoying engine light on. Showing code P0031, I thought it was gas cap, since it didnt click once and when i filled up, i realized it wasnt on tight. That could've caused it to damage or fool the air fuel sensor. Once i replaced the cap, every time I filled up, I could hear the air pressure release when I open it. After 9 years, the old gas cap couldn't hold pressure anymore. I STRONGLY suggest you buy the gas cap from your car's manufacture and not an aftermarket one or universal one. I found my toyota one on amazon for 20 when the dealer wanted 32. Either way, I still got P0031.

So the dealer wanted $240 and local mechanics wanted between 100-200 just for the sensor. Labor was between 20-60 at local mechanics and up to 200 at dealer. wouldve cost me 150-500! Found this here on Amazon for Around $100, and jumped at the opportunity. Don't use Amazon's part checker to see if it fits your vehicle. Go on Denso after market's website and use that. 234-9001 did fit mine, although Amazon's part checker only said it fit 2 out of the 6 times I checked.

That being said, I don't believe this is 100% Denso, as it even says on amazon's website. It looks like it's made by a company with strict Denso standards, and have to pass certain requirements. Denso then puts their label, "Denso First time fit" on it.

These parts are pretty sensitive, so don't drop them or anything. Surprised the box didn't come with any padding. I returned the first order because the package seemed damaged. I didn't open the bag because I didn't want to be responsible in case it didn't work. Amazon promptly sent me a return label and issued me a refund. I bought it again, and it came perfectly.

This part is for the front. This particular tacoma has two. below the car, toward the passenger side before the cat is called upstream and that is this particular sensor i replaced. It is a "fuel and air ratio sensor". the 2nd is toward the middle end of the car, by the cat. Apparently this is the downstream one, and it's an 02 Sensor. I hear the front one is the one that needs most replacing.

It took me 6-8 minutes to replace it. It was my first time replacing it and I don't work on my car very much. Its that easy. Make sure the car isn't warm or hot. You could burn yourself down there. Snap off the gray electrical connector, either w a push at the groove and pull it apart, or a flat screwdriver. Then for the two 12 mm nuts, maybe use pb blaster or wd40 to lubricate it a bit(i used wd40) but I'd wipe it down, especially around the sides. I wouldn't want that stuff dripping into the hole when you loosen the nuts and remove the old sensor. loosen the nut a little bit and you should be able to use our hands to take it off. remove everything. put new sensor in, with the supplied gasket, put the nuts back on, but i guess not too tight. just hand tight. snap the electrical connector on and be sure the wire is away from anything moving or hot. there should be a little area that the connectors snap onto.

I removed the negative cable for the battery for 10 minutes to allow everything to clear. then put it back on, changed back all my radio codes and preset stations and whatnot. Started the car and the light was gone. Now if you don't know too much about cars, when you remove a battery or just the cable, it resets the computer. So your car may be a little shaky or hesitant for the first 10-40 miles, as it learns how to adapt to your driving habits again. after that, smooth sailing and no annoying light. Thanks Amazon and other reviewers! go Tacos!

11 people found this helpful

Helpful

Joe's hobby workshop

Works and fits out of the box.

Reviewed in the United States on November 10, 2019

Verified Purchase

Works well and is fairly straight forward to install on a 2004 Tundra. Tried cheaper made in China version that threw a code immediately so I had to go back to the Denso OEM version that it replaced which lasted 7 years before the heater quit. Hoping this one lasts longer. Except for the longevity of the one that was replaced I would have given it 5 stars. Mind you, the original factory sensor lasted 8 years so that might be the expectation.

One person found this helpful

Helpful

Top reviews from other countries

Amazon Customer

Heated o2 sensor

Reviewed in Canada on March 21, 2024

Verified Purchase

Cheaper than the dealer and any parts counter and it’s oem

E. S.

It did what is was supposed too and fixed the problem

Reviewed in Canada on April 23, 2023

Verified Purchase

It did what is was supposed too and fixed the problem

amp3d

Toyota OEM. The good stuff

Reviewed in Canada on November 6, 2017

Verified Purchase

Denso sensor, works awesome! There's a reason why this is a Toyota OEM part.
Fit my 2002 Toyota Tacoma like a glove. In case you're not sure, this is the sensor AFTER the cat, not the O2 sensor before it.

Kilometers

‘03 Tacoma 3.4L V6

Reviewed in Canada on July 26, 2023

Verified Purchase

This part worked for my Tacoma and appears to be a genuine Denso part.

Check engine light was deleted after install and it has not come back on after 3 months of driving.

This part is for the sensor located upstream of the catalytic converter. 02 sensor is downstream.

Amazon Customer

Proper fit and the right unit as it was identified ...

Reviewed in Canada on July 30, 2018

Verified Purchase

Proper fit and the right unit as it was identified to be. So much cheaper than at dealership! Toyota Dealer is a robber!

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Denso 234-9001 Upstream Air Fuel Ratio Oxygen Sensor with 10.6” 4-Wire Harness, for Auto Trans Equipped Vehicles

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