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Denso 234-4209 Universal Oxygen Sensor with 11.5” 4-Wire Harness (connectors not included)

4.2 4.2 out of 5 stars 1,168 ratings

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List Price: $55.35

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Brand Denso
Item dimensions L x W x H 5.91 x 2.13 x 1.93 inches
Material Zirconium
Item Weight 4.64 ounces
Style Modern

About this item

  • Manufactured to the highest O.E. quality, guaranteed to fit right
  • Does NOT include the connectors
  • Aluminum oxide trap, this extra layer helps to protect from silicone and lead poisoning
  • Stainless steel housing and porous Teflon filter all contribute to make a long life
  • Improved engine performance and greater fuel efficiency
  • Prevents premature sensor failure
See more product details

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WARNING:

CHOKING HAZARD -- WARNING: This product contains small magnets. Swallowed magnets can stick together across intestines causing serious infections and death. Seek immediate medical attention if magnets are swallowed or inhaled.

From the manufacturer

About Us

DENSO is a supplier of advanced automotive technology, systems and components for major automakers.

The DENSO Philosophy guides our corporate actions, ensuring that we will continue to be trusted by people around the world.

Everything we do is based on our philosophy: "Contributing to a better world by creating value together with a vision for the future."

DENSO will prepare a brighter future for generations to come through our commitment to protecting lives. We believe the unique strengths of our research, production and people make anything possible.

Product Description

Denso Universal Oxygen Sensor is designed with precision, manufactured to the highest O.E. quality. This oxygen sensor is of superior quality and will outlast most other oxygen sensors. Constructed with exclusive aluminum oxide trap, this extra layer helps to protect from silicone and lead poisoning which causes premature sensor failure. This combined with other Denso high quality features such as stainless steel housing and porous Teflon filter all contribute to make a long life oxygen sensor with improved engine performance and greater fuel efficiency.

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Denso 234-4209 Universal Oxygen Sensor with 11.5” 4-Wire Harness (connectors not included)

Denso 234-4209 Universal Oxygen Sensor with 11.5” 4-Wire Harness (connectors not included)


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What's in the box

  • Oxygen Sensor
  • Product guides and documents

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    Denso 234-4209 Universal Oxygen Sensor with 11.5” 4-Wire Harness (connectors not included)
    Denso 234-4209 Universal Oxygen Sensor with 11.5” 4-Wire Harness (connectors not included)
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    Added to Cart
    Price-25% $41.28
    List:$55.35
    $34.99$6.99-29% $45.58
    List:$64.31
    -33% $24.88
    List:$37.24
    $41.99
    Delivery
    Get it as soon as Friday, May 17
    Get it as soon as Friday, May 17
    Get it as soon as Friday, May 17
    Get it as soon as Friday, May 17
    Get it as soon as Friday, May 17
    Get it as soon as Friday, May 17
    Customer Ratings
    Mileage
    4.1
    3.1
    3.6
    4.3
    3.0
    3.1
    Value for money
    4.0
    3.5
    3.8
    4.5
    4.0
    3.5
    Easy to install
    3.9
    4.1
    3.8
    4.7
    4.2
    4.1
    Easy to use
    4.4
    4.0
    4.4
    Sold By
    Amazon.com
    Marsflex
    YOGEIER
    Amazon.com
    Amazon.com
    Marsflex
    specific uses
    Universal Automotive Oxygen Sensor
    Oxygen Sensor
    Molybdenum
    Oxygen Sensor
    Oxygen Sensor
    Oxygen Sensor
    material
    Zirconium
    Steel
    Zirconium
    Zirconium
    Aluminum Oxide
    mounting type
    Threaded
    Flange Mount
    Flange Mount
    Threaded
    Threaded
    style
    Modern
    Upstream
    Compact
    Modern
    Modern
    Upstream
    weight
    0.29 pounds
    0.26 pounds
    0.01 ounces

    Looking for specific info?

    Customer reviews

    4.2 out of 5 stars
    4.2 out of 5
    1,168 global ratings

    Customers say

    Customers like the performance, value, and ease of installation of the electronic sensor. For example, they mention it works well, is reasonable for the right problem, and has clear installation instructions. That said, some complain about the connector. Opinions are mixed on quality and check engine light.

    AI-generated from the text of customer reviews

    148 customers mention109 positive39 negative

    Customers like the performance of the electronic sensor. For example, they mention it works well, has very little problems, and improves MPG. Some say that the car feels faster after installing it.

    "Worked great for my 2006 toyota matrix xr fwd downstream only it means is the one after the catalytic converter,the one before the catalytic is not..." Read more

    "Car feels alot faster with new 02 sensors.. replaced and spliced both upstream sensor harness...." Read more

    "...But it did not work on my friends 2001 Toyota. She has a 2001 v6 Camry automatic; the 1mz-fe engine...." Read more

    "...My MPG got better after installing it. Check Engine Light didn't come back yet and it is working fine so far. It has been a while." Read more

    85 customers mention74 positive11 negative

    Customers like the value of the electronic sensor. They say it's better than half the cost of a custom fit unit, and the best price for quality sensor. Some say it is reasonable for the right problem and an economical way to replace your OEM Denso sensor if you don't mind splicing the wires. Overall, customers are happy with the value and quality of the product.

    "Great value, clear installation instructions but might not suit a first time DIY mechanic job.working well for the past 30,000 miles" Read more

    "...Both tools are well made and inexpensive. Two tips: 1) remove the old sensor while the engine is hot (be careful), as it is much easier that way...." Read more

    "...Perfectly fine product and, as always with Amazon, got it at a GREAT price. But it did not work on my friends 2001 Toyota...." Read more

    "Great little product and had very little problems. Was able to jack the vehicle up and simply cut the old oxygen sensor off and put this one in...." Read more

    68 customers mention61 positive7 negative

    Customers find the installation of the electronic sensor to be easy. They mention that the instructions are clear and easy to follow. They also appreciate the crimp connectors and shrink wrap insulation that are included. Customers also say that the wiring is not very difficult with the provided crimpers and shrink wrapping. Overall, they recommend this product for its ease of installation.

    "Great value, clear installation instructions but might not suit a first time DIY mechanic job.working well for the past 30,000 miles" Read more

    "...In any case - installed easily (albeit in the wrong location) with some extra leverage from a cheater bar...." Read more

    "...Comes with everything you need to install." Read more

    "...Installation is super simple for the front exhaust manifold O2 sensor but you'll need a special 7/8" O2 sensor socket to remove the one on the back..." Read more

    40 customers mention28 positive12 negative

    Customers like the fit of the electronic sensor. They mention that it fits fine, it's a universal fit requiring splicing wires, and that the connections are super tight.

    "...However, the Denso 234-4209 sensor in this review was a perfect fit for my 2.4L Toyota engine, and the locations for both sensors are just under..." Read more

    "...Otherwise its perfect fit and has been working fine and code cleared immediately." Read more

    "...Knocked it down a star b/c had a hard time fitting the shrink wrap over the butt connectors and it was barely long enough to seal both ends; I'll..." Read more

    "...This was a great fit and check engine light went out.First, I disconnected the battery...." Read more

    91 customers mention50 positive41 negative

    Customers are mixed about the quality of the electronic sensor. Some mention it's a great product, while others say it'll not fit or is faulty.

    "...Both tools are well made and inexpensive. Two tips: 1) remove the old sensor while the engine is hot (be careful), as it is much easier that way...." Read more

    "...But I had the remaining fault code again with another brand of O2 sensor. After I drove 10-20 miles with Denso O2 sensor again, I scanned the..." Read more

    "...Also, the Bosch sensor seems to perform well too even though it does not look exactly like the Denso (Honda OEM) part it replaced." Read more

    "...Computer scan showed o2 sensor and bad high pressure switch for power steering reservoir...." Read more

    26 customers mention12 positive14 negative

    Customers have mixed opinions about the check engine light. Some customers say the sensor has cleared the light, while others say it still comes on.

    "...well after driving over 50 miles and two days later the engine light came back on and guess what bad o2 senor the same one i justed replaced with..." Read more

    "...4209 sensor, I ordered the 9021 and problem is now fixed; check engine light is gone...." Read more

    "...The fit was fine but the check engine light still comes on after being cleared...." Read more

    "...in my wife's CRV and have been driving around for a month and no check engine light. I am getting better fuel mileage and the engine runs smoother...." Read more

    43 customers mention8 positive35 negative

    Customers are dissatisfied with the connector provided with the electronic sensor. They mention that it does not have a plug to fasten into the car's wiring harness. Some customers also say that only three crimp connectors were included when four are required.

    "...the instructions to use old connector because the sensor did not come with a connector...." Read more

    "Only three crimp connectors were included when four are required. Otherwise, it arrived within 48 hours and instructions were decent." Read more

    "...my 2003 Mitsubishi Montero Sport - this was the only one that was not Plug-N-Play...." Read more

    "...Keep in mind, this is a universal replacement part and does not come with the connector plug for your vehicle...." Read more

    7 customers mention0 positive7 negative

    Customers find the connectivity of the electronic sensor to be difficult to connect, loose, and difficult to work with. Some mention that the reader keeps giving them a "cannot connect" error.

    "...the connector is IDENTICAL, the reader kept giving me a "cannot connect" error...." Read more

    "...I used the clamping method as suggested but found that the connection is not tight as I just used a regular wiring clamping tool...." Read more

    "...You are supposed to crimp but the connection is so loose I had to solder so the wires will not fall off...." Read more

    "This sensor did not work on my car. First it was difficult to work with connecting the wires to the conector, also once everything was connected it..." Read more

    A good DIY.
    5 Stars
    A good DIY.
    Great price. Detailed instruction. Heat shrink, butt connector, anti-seize provided. What else I can say!Take me an hour to remove the old one, connect the harness and put it on. The only trouble is the sensor wrench. I thought I have a wrench that size but it don't, only socket, so I had to run to local store for the wrench. Better buy it together with the sensor.I also notice that the difference between the original one and this universal sensor is the number of holes on the cover, as one comment has mentioned. Image attached. My car is Avalon 98 sold and run in California. I was a bit worried when notocing the difference, however, it clear the CEL, code P1133 and P1135.
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    Top reviews from the United States

    Reviewed in the United States on March 11, 2024
    Worked great for my 2006 toyota matrix xr fwd downstream only it means is the one after the catalytic converter,the one before the catalytic is not the same so don't get confused ,you do have to crimp the wires because it doesn't come with the connector to the car but it's pretty easy I made a video on the youtbe if you need help, it comes with the crimp connectors for the wire so you don't have to buy any ,make sure to connect the matching color wires, after I installed the sensor and driving for about 5 miles 3 codes came up but I just erased them with the cheap scanner and they never came back so that means it worked great after 50 miles of installation
    Reviewed in the United States on January 29, 2024
    Car feels alot faster with new 02 sensors.. replaced and spliced both upstream sensor harness. Basically match up the wiring colors and use included crimps and heat shrink. No need for solder. Overal saved crap ton of money going with these. Highly recommend.
    Reviewed in the United States on March 13, 2024
    Great value, clear installation instructions but might not suit a first time DIY mechanic job.
    working well for the past 30,000 miles
    Reviewed in the United States on July 16, 2013
    I was throwing a code for a misfire and bad 02 sensor 1 on my '09 taco four banger. Since this was one of only two search results for my truck that came up for Denso, I assumed that both 02 sensors were the same; not so! Sensor 1 Bank 1 is the UPSTREAM AIR FUEL RATIO sensor according to Amazon(despite the code reader saying "02 Sensor"). The A/F sensor isn't even listed under the 02 sensor category for my truck.

    Thankfully, the code came back right away and I double checked part numbers at another site.

    In any case - installed easily (albeit in the wrong location) with some extra leverage from a cheater bar. Also don't forget to remove the wire before wrenching it and to be aware of any locks on the wire connection you have to push down before pulling (it may help to have an extra person to hold the release). Knocked it down a star b/c had a hard time fitting the shrink wrap over the butt connectors and it was barely long enough to seal both ends; I'll ditto the other reviewer that advised to run out to radio shack to pick up the yellow 22GA butt connectors and get some longer shrink tubes.

    Overnighted the correct sensor now (Denso 234-9050) and hopefully the connectors are the same **knock on wood** since I might as well use this one to replace the old downstream sensor.

    Will update if any issues occur once sensor is installed correctly.
    One person found this helpful
    Report
    Reviewed in the United States on May 5, 2011
    I bought this denso oxygen sense 234-4209 universal back in march 22 of 2011. Weather has been bad in the chicago area, so i just replaced the o2 sensor may 3 2011. Reset the computer, so it can detect the good sensor well after driving over 50 miles and two days later the engine light came back on and guess what bad o2 senor the same one i justed replaced with this denso garbage.Trying to save money bought it through amazon which did save me money initially but know i'm out money for a part that never worked and now i have to spend more money on something i already bought, i will never buy automative stuff from amazon again. Bob is very very upset that amazon will not give me refund. Even though the part never work they sell JUNK.
    4 people found this helpful
    Report
    Reviewed in the United States on September 22, 2012
    After a long search this part turned out to be a perfect fit for my Japanese domestic model 2001 Toyota Estima (called the Previa in the USA). Five days after my engine warranty expired my engine check light turned on (go figure). As I'd just bought the car used, and since my salary is low and I'm trying to pay my Japanese bills in yen during the worst dollar/yen exchange rate in history, I decided to search online for a DIY cure. Since the car has an OSDII connector my first thought was to purchase a good middle-quality OSD reader from a USA vendor (they don't sell them here) so I could read the engine code. Such readers are standardized and supposed to work in ALL CARS MADE SINCE 1996, or so said the advertising. When it arrived I tested it, and although the connector is IDENTICAL, the reader kept giving me a "cannot connect" error. After much online searching I found that Japanese domestic cars do not use an OSDII connector, they use a PHYSICALLY IDENTICAL but ELECTRICALLY INCOMPATIBLE DLC3 CONNECTOR (the capitol letters are there to show my annoyance with the car manufacturers for creating "standards" that are anything but). Fortunately the vendor I bought the reader from gave me a refund for all but the return shipping. A kind car mechanic had the correct reader, tested the car for me for free, and gave me the code, P0155. An online search found that it referred to the Bank 2 Sensor 1 O2 sensor heating element. Now came the search for a replacement part, which was an almost as difficult task because there are many available and their prices vary widely depending on whether it comes with an original connector or not. It's very easy to get the wrong one. However, the Denso 234-4209 sensor in this review was a perfect fit for my 2.4L Toyota engine, and the locations for both sensors are just under the hood behind the radiator so getting to them was easy. I bought two at $36 each plus a split socket and a thread-chaser. The Lisle 12100 split-socket is a must, the Lisle 20200 thread-chaser is not, unless you're sloppy with the insertion. Both tools are well made and inexpensive. Two tips: 1) remove the old sensor while the engine is hot (be careful), as it is much easier that way. 2) don't use the crappy crimp-on thingies that come with the sensor, solder the wires instead, but use lots of flux as rosin-core solder alone won't bond to the sensor's very stiff wires. I found that bending the bare wires back into the shape of a fishhook and squeezing them tight with pliers stabilizes the joint long enough to apply the solder. Use the small-diameter heatshrinkable tubing that came in the kit on each joint PLUS a six inch piece of 1/2" heatshrinkable tubing to cover all four bonded and covered wires together. The latter is not absolutely necessary but it makes a tighter cover and it's better than using black tape. Also use the anti-seize compound that comes with the kit - there's enough for at least two sensors in each tube. Total cost for two sensors, tools, and shipping was less than $100, much less than the $300 fee most dealers would have charged to change just one sensor.
    3 people found this helpful
    Report

    Top reviews from other countries

    Translate all reviews to English
    andres a.
    5.0 out of 5 stars Cumplió mis espectativas, gracias
    Reviewed in Mexico on January 5, 2022
    Estoy satisfecho, lo utilicé en la reparación de una camioneta Sienna
    ken
    5.0 out of 5 stars excellent
    Reviewed in Canada on February 15, 2021
    not sure about these negative reviews...but.. the wires are color coded... and it also came with connectors and heat shrink and a bit of what i presume is anti seize.. also.. if connecting 4 wires together is too much a hassle then you deserve to get dinged an extra 50-100% cost..
    overall im thoroughly impressed with my purchase, it came faster than i needed it. and for the price i am still asking myself why anyone would pay 2-3 times more to save themselves 10 minutes of crimping.. unless of course you are some kind of multi millionaire...
    2 people found this helpful
    Report
    Luis M.
    1.0 out of 5 stars No tiene marca es generico
    Reviewed in Mexico on February 19, 2024
    No sirve para nada no tiene marca es genérico sólo fue una pérdida de tiempo y de dinero. No viene grabado de la marca ni modelo
    CThab
    5.0 out of 5 stars Perfect for my '99 Suzuki Esteem
    Reviewed in Canada on February 4, 2023
    Easy to solder with your existing connector, or just get the sensor with the connector included. About 3-4 years ago, and in a span of 2 years both sensors failed on my car so I purchased both sensors that came with and without the connector. Today February 3 '23 both are running strong.
    One person found this helpful
    Report
    Alex Stewart
    4.0 out of 5 stars Easy to splice in to old connector
    Reviewed in Canada on October 25, 2016
    Codes reset in a day. Easy to splice in to old connector. Very happy with the replacement (been a few weeks of no codes).
    One person found this helpful
    Report