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Denso 234-9002 Air Fuel Ratio Sensor

4.6 4.6 out of 5 stars 685 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Automotive Replacement Oxygen Sensors by Denso

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Brand Denso
Material Zirconium
Item Weight 0.26 Pounds
Style Durable
Mounting Type Flange Mount

About this item

  • Efficient Fuel Consumption.Material:Zirconium
  • Highly accurate
  • Easy installation
  • Constructed from durable material
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Denso 234-9002 Air Fuel Ratio Sensor
Denso 234-9002 Air Fuel Ratio Sensor
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Price-26% $152.45
List:$204.95
-31% $96.21
List:$138.57
$36.99$56.99$76.16$6.99
Delivery
Get it as soon as Tuesday, Mar 26
Get it as soon as Tuesday, Mar 26
Get it as soon as Tuesday, Mar 26
Get it as soon as Tuesday, Mar 26
Get it as soon as Tuesday, Mar 26
Get it as soon as Tuesday, Mar 26
Customer Ratings
Easy to install
4.7
4.5
4.1
3.9
Mileage
4.4
4.6
3.1
3.7
Value for money
4.4
4.5
3.5
3.9
Sold By
Amazon.com
Amazon.com
Marsflex
BATU
Water Drop Store
YOGEIER
specific uses
Oxygen Sensor
Oxygen Sensor
Oxygen Sensor
Molybdenum
material
Zirconium
Zirconium
leather
Steel
mounting type
Flange Mount
Threaded
Flange Mount
Flange Mount
Flange Mount
style
Durable
Modern
Upstream
Modern
2 pc o2 sensors
Compact

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

Our parent company, Monarch Products, is a family business started in 1969 by Jim Gambill, selling motorcycle and garage accessories.

Over time and with much dedication, Jim grew the motorcycle accessory division, and in 1980, added automotive product lines.

Product Description

Denso 234-9002 Air Fuel Ratio Sensor

Product information

Technical Details

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Product Warranty: For warranty information about this product, please click here [PDF ]

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Denso 234-9002 Air Fuel Ratio Sensor


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What's in the box

  • Fuel Sensor
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    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    685 global ratings

    Customers say

    Customers like the ease of installation, fit, value, and check engine light of the electronic sensor. For example, they mention it's easy to install, fits perfectly, and is built exactly to Toyota specs. Some are happy with responsiveness, and ease of changing. That said, opinions are mixed on quality.

    AI-generated from the text of customer reviews

    73 customers mention73 positive0 negative

    Customers find the installation of the electronic sensor to be easy. They mention that there is no need to assemble the sensor, it installs far easier than expected, and no special tools are needed. Some mention that the sensor works great and comes with installation installation.

    "The sensor was an exact fit for my 2001 4runner. Good quality and easy installation." Read more

    "Product appears to be exactly the same as OEM, installation was easy and resolved my P1135 air fuel ratio code...." Read more

    "Purchased cheaper one online and never worked, this O2 sensor was simple install and engine light is off. I recommend this product" Read more

    "...my mechanic but this seemed like an easy enough fix and no special tools were needed...." Read more

    50 customers mention50 positive0 negative

    Customers are satisfied with the fit of the electronic sensor. They mention that it fits perfectly and is built exactly to Toyota specs.

    "The sensor was an exact fit for my 2001 4runner. Good quality and easy installation." Read more

    "...They are built EXACTLY to Toyota specs. The Toyota ECU is looking for VERY SPECIFIC DATA from these sensors...." Read more

    "Arrived very quickly! Product fit perfectly on my 2001 Toyota 4 Runner SR5 4-wheel drive. My check engine and VSC lights had been going off..." Read more

    "...It fit perfectly including correct electrical fitting and wire length...." Read more

    44 customers mention44 positive0 negative

    Customers appreciate the value of the electronic sensor. They say it is the right product at an excellent price and worth the extra cash. Some say it's easy to install and saves hundreds of dollars versus having a mechanic install it.

    "...than standard 2 day prime, but still came quickly and the price was excellent. Product appeared identical to the original...." Read more

    "Exactly what I needed and at a cheaper price then the brick and mortar options...." Read more

    "Fair price 👌 and on time......" Read more

    "Good price for quality Denso OEM product replacment 02 sensor" Read more

    29 customers mention22 positive7 negative

    Customers like the check engine light sensor. They say it works perfectly and resolves their check engine or VSC light.

    "...online and never worked, this O2 sensor was simple install and engine light is off. I recommend this product" Read more

    "...This Denso 234-9002 sensor fit my 4Runner perfectly and the check engine light is out. You won't be disappointed if you purchase it from Amazon." Read more

    "...Check Engine light is now out. Took 15-20 minutes to install on my 2001 4Runner SR5." Read more

    "Worked exactly as it should. Check engine light is out." Read more

    13 customers mention13 positive0 negative

    Customers are satisfied with the responsiveness of the electronic sensor. They mention that it clears codes and the engine runs smooth. Some say that the sensor improves how their vehicle runs and that it helps with MPG and throttle response.

    "...I then drove about 15 miles, and then tested it again. No codes came up! The next test was the smog check, which I passed easily...." Read more

    "...Now, I can see a difference right away with the responsiveness and a better MPG...." Read more

    "...Installed the new gasket and tighten to specs.So far so good, no code or CEL yet after 1000 miles." Read more

    "...I replaced it with little difficulty and the code is clear and the truck is running great." Read more

    10 customers mention10 positive0 negative

    Customers find the electronic sensor easy to replace. They mention that it takes almost no time to replace the old sensor. Some customers also say that the sensor can be easily replaced with two screws and a plug.

    "...It was very easy to swap out the old sensor and replace it with this one. Saved a few hundred dollars doing it myself...." Read more

    "Perfect fit, comes with gasket. Easy part to replace for nearly anyone with a 12mm wrench...." Read more

    "Denso is always great on my toyotas. They only last about 80k. Easy to change on my 1999 4Runner v6...." Read more

    "...The sensor was a breeze to replace and the CEL cleared right away once I was done. Very happy with this purchase." Read more

    41 customers mention28 positive13 negative

    Customers are mixed about the quality of the electronic sensor. Some mention it's a quality product, while others say that it was defective.

    "The sensor was an exact fit for my 2001 4runner. Good quality and easy installation." Read more

    "...My sensor bolts were in great condition with no corrosion so I did not bother replacing them as some people suggest...." Read more

    "...The Sensor internal heater circuit is NOT repairable, so unless you have a short in your wiring leading to the sensor, a replacement O2 Sensor is..." Read more

    "...Installation was easy. Part was GREAT, definately buy it and save yourself some money from the dealer $$$$!" Read more

    This Denso Part Is The Toyota OEM Part...A GREAT DEAL!
    5 Stars
    This Denso Part Is The Toyota OEM Part...A GREAT DEAL!
    I own a 2003 Toyota Tacoma 2WD EXT cab with an automatic transmission and 2.4 liter 4-cylinder engine. The vehicle has 65,000 miles.I recently got a CHECK ENGINE amber light. I attached my OBDII Diagnostic Reader/Scanner device which I purchased on Amazon a few years ago and discovered a P0135 code. This indicates a fault in the Air Fuel Sensor (aka, O2 Sensor…used interchangeably), Bank 1, Sensor 1, and more specifically, a fault in the forward Air Fuel Sensor Heater Circuit. The Toyota ECU expects to see the Air Fuel Sensor electrically heated to a pre-determined temperature in a specified period of time after start, or it will send a P0135 code.There are two O2 sensors on my Tacoma (four on some of the Toyota V8’s), one located immediately before the catalytic convertor and one immediately behind it. “Bank 1” is the forward of the two O2 sensors. The Sensor internal heater circuit is NOT repairable, so unless you have a short in your wiring leading to the sensor, a replacement O2 Sensor is in order if you’ve received the P0135 OBDII diagnostic code.Denso is the OEM manufacturer for the Toyota Air Fuel sensors. They are built EXACTLY to Toyota specs. The Toyota ECU is looking for VERY SPECIFIC DATA from these sensors. While some of the after market Chinese air fuel sensors offered on Amazon are less expensive, they may not meet specific Toyota ECU specs and will trip a CHECK ENGINE amber light regardless of their age. Accordingly, I recommend the Denso OEM Air Fuel Sensors to avoid any of these issues. When ordering the Denso Air Fuel Sensor on Amazon make absolutely sure you list ALL your vehicle details…model year, specific model type, specific engine size, manual or automatic transmission, etc. as the sensors vary in design based upon each of the preceding. You can check the Denso web site to cross reference what Amazon is showing as the correct part for additional peace of mind.Removing the old part and installing the new one doesn’t require a great deal of mechanical expertise. Your Toyota dealer will quote $350-$400 for parts and labor to complete the job. You can do it for the cost of the Denso OEM part on Amazon and your willingness to climb under your truck.The tools recommended for the job are:1. 12mm socket2. 12mm open end wrench3. 10mm socket4. 10mm open end wrench5. socket wrench6. small flat head screwdriver7. diagonal cutters8. Zip-tie9. Heat resistant anti-seize compoundToyota is notorious for their positive-locking electric connections, and this part is no exception. The electrical connector has a tiny locking tab located on the side of the connector which must be released to separate the male and female ends. More on that later.Here’s what I recommend to complete the process:1. Remove the electrical connector metal support bracket to allow easy access to the electrical connection. Use diagonal cutters to cut any retaining parts for the electrical cable. Use a 10mm socket and/or 10mm open end wrench to do this. It’s tight quarters…very tedious…one click at a time. BUT…it’s the only way you can truly obtain access/purchase to remove the electrical connection. This is the “easy” part…reattaching the bracket later is THE most difficult part of this entire job.2. Remove the old O2 sensor from the exhaust pipe. I used both an open end 12mm wrench and 12mm socket. If the bolts are rusted use your favorite penetrating oil. I applied this a day before I did the job.3. Separate the electrical connection. ****Here’s the trick to removing an infamous Toyota electrical connection: use a small flat head screwdriver to drive under the plastic locking clamp on the SHORTER SIDE of the electrical connector to move it up and off the plastic locking tab.**** If you do this you can easily pull the connector apart using you fingers.4. Install the new Air Fuel sensor. I began with the electrical connector. Push the male sensor connector on to the female connector attached to your vehicle. There are two ribs on the side of the connector to ensure you get this aligned correctly. You’ll hear a “snap” as the parts mate and the locking tab secures the two parts.5. Coat the 12mm studs with anti-seize compound. Place the NEW gasket on the fitting…DO NOT re-use an old gasket. Denso includes a new gasket with each sensor part. Using caution not to get anti-seize compound on the new sensor, slide it over the studs. Hand tighten the 12mm nuts. Then ALTERNATE tightening each nut in SMALL INCREMENTS until you’ve reached the magical 14 foot-pounds of torque recommended in the Toyota shop manual. If you have any doubt regarding the cleanliness of the sensor…clean it with isopropyl alcohol before installation.6. Now the HARD PART: reinstalling the electrical connection supporting bracket. This will be a tedious process. I initially aligned the bolt on the bracket and after MULTIPLE ATTEMPTS…finally got the bolt started. I hand-tightened it from there…and then used the 10mm socket. This process will test your patience…but you’ll eventually get it. Just think of the several hundred bucks you’ve saved to keep your sense of humor.7. Install a zip-tie to secure the O2 sensor electrical lead to one of the metal automatic transmissions lines…or whatever your vehicle originally had in place to secure the lead.8. Reset your OBDII to eliminate the P0135 code.9. Drive your truck long enough to allow it to become fully heated to normal operating temperature. The Toyota ECU expects to see the Air Fuel Sensor electrically heated to a pre-determined temperature in a specified period of time after start, or it will send a P0135 code. If your vehicle is fully warmed up…and you don’t get a CHECK ENGINE amber light…congratulations…you fixed the problem! I always turn off the engine and ignition and re-start a few times just to be sure.10. Politely apologize to your neighbors for any profanity they might’ve overheard during you many attempts to re-attach the electrical connection support bracket.I’ve attached photos of the major aspects of the installation process. Good luck!
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    Top reviews from the United States

    Reviewed in the United States on January 3, 2024
    Reviewed in the United States on December 27, 2018
    Customer image
    5.0 out of 5 stars This Denso Part Is The Toyota OEM Part...A GREAT DEAL!
    Reviewed in the United States on December 27, 2018
    I own a 2003 Toyota Tacoma 2WD EXT cab with an automatic transmission and 2.4 liter 4-cylinder engine. The vehicle has 65,000 miles.
    I recently got a CHECK ENGINE amber light. I attached my OBDII Diagnostic Reader/Scanner device which I purchased on Amazon a few years ago and discovered a P0135 code. This indicates a fault in the Air Fuel Sensor (aka, O2 Sensor…used interchangeably), Bank 1, Sensor 1, and more specifically, a fault in the forward Air Fuel Sensor Heater Circuit. The Toyota ECU expects to see the Air Fuel Sensor electrically heated to a pre-determined temperature in a specified period of time after start, or it will send a P0135 code.
    There are two O2 sensors on my Tacoma (four on some of the Toyota V8’s), one located immediately before the catalytic convertor and one immediately behind it. “Bank 1” is the forward of the two O2 sensors. The Sensor internal heater circuit is NOT repairable, so unless you have a short in your wiring leading to the sensor, a replacement O2 Sensor is in order if you’ve received the P0135 OBDII diagnostic code.
    Denso is the OEM manufacturer for the Toyota Air Fuel sensors. They are built EXACTLY to Toyota specs. The Toyota ECU is looking for VERY SPECIFIC DATA from these sensors. While some of the after market Chinese air fuel sensors offered on Amazon are less expensive, they may not meet specific Toyota ECU specs and will trip a CHECK ENGINE amber light regardless of their age. Accordingly, I recommend the Denso OEM Air Fuel Sensors to avoid any of these issues. When ordering the Denso Air Fuel Sensor on Amazon make absolutely sure you list ALL your vehicle details…model year, specific model type, specific engine size, manual or automatic transmission, etc. as the sensors vary in design based upon each of the preceding. You can check the Denso web site to cross reference what Amazon is showing as the correct part for additional peace of mind.
    Removing the old part and installing the new one doesn’t require a great deal of mechanical expertise. Your Toyota dealer will quote $350-$400 for parts and labor to complete the job. You can do it for the cost of the Denso OEM part on Amazon and your willingness to climb under your truck.
    The tools recommended for the job are:
    1. 12mm socket
    2. 12mm open end wrench
    3. 10mm socket
    4. 10mm open end wrench
    5. socket wrench
    6. small flat head screwdriver
    7. diagonal cutters
    8. Zip-tie
    9. Heat resistant anti-seize compound
    Toyota is notorious for their positive-locking electric connections, and this part is no exception. The electrical connector has a tiny locking tab located on the side of the connector which must be released to separate the male and female ends. More on that later.
    Here’s what I recommend to complete the process:
    1. Remove the electrical connector metal support bracket to allow easy access to the electrical connection. Use diagonal cutters to cut any retaining parts for the electrical cable. Use a 10mm socket and/or 10mm open end wrench to do this. It’s tight quarters…very tedious…one click at a time. BUT…it’s the only way you can truly obtain access/purchase to remove the electrical connection. This is the “easy” part…reattaching the bracket later is THE most difficult part of this entire job.
    2. Remove the old O2 sensor from the exhaust pipe. I used both an open end 12mm wrench and 12mm socket. If the bolts are rusted use your favorite penetrating oil. I applied this a day before I did the job.
    3. Separate the electrical connection. ****Here’s the trick to removing an infamous Toyota electrical connection: use a small flat head screwdriver to drive under the plastic locking clamp on the SHORTER SIDE of the electrical connector to move it up and off the plastic locking tab.**** If you do this you can easily pull the connector apart using you fingers.
    4. Install the new Air Fuel sensor. I began with the electrical connector. Push the male sensor connector on to the female connector attached to your vehicle. There are two ribs on the side of the connector to ensure you get this aligned correctly. You’ll hear a “snap” as the parts mate and the locking tab secures the two parts.
    5. Coat the 12mm studs with anti-seize compound. Place the NEW gasket on the fitting…DO NOT re-use an old gasket. Denso includes a new gasket with each sensor part. Using caution not to get anti-seize compound on the new sensor, slide it over the studs. Hand tighten the 12mm nuts. Then ALTERNATE tightening each nut in SMALL INCREMENTS until you’ve reached the magical 14 foot-pounds of torque recommended in the Toyota shop manual. If you have any doubt regarding the cleanliness of the sensor…clean it with isopropyl alcohol before installation.
    6. Now the HARD PART: reinstalling the electrical connection supporting bracket. This will be a tedious process. I initially aligned the bolt on the bracket and after MULTIPLE ATTEMPTS…finally got the bolt started. I hand-tightened it from there…and then used the 10mm socket. This process will test your patience…but you’ll eventually get it. Just think of the several hundred bucks you’ve saved to keep your sense of humor.
    7. Install a zip-tie to secure the O2 sensor electrical lead to one of the metal automatic transmissions lines…or whatever your vehicle originally had in place to secure the lead.
    8. Reset your OBDII to eliminate the P0135 code.
    9. Drive your truck long enough to allow it to become fully heated to normal operating temperature. The Toyota ECU expects to see the Air Fuel Sensor electrically heated to a pre-determined temperature in a specified period of time after start, or it will send a P0135 code. If your vehicle is fully warmed up…and you don’t get a CHECK ENGINE amber light…congratulations…you fixed the problem! I always turn off the engine and ignition and re-start a few times just to be sure.
    10. Politely apologize to your neighbors for any profanity they might’ve overheard during you many attempts to re-attach the electrical connection support bracket.
    I’ve attached photos of the major aspects of the installation process. Good luck!
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    38 people found this helpful
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    Reviewed in the United States on September 8, 2013
    30 people found this helpful
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    Top reviews from other countries

    Denny
    5.0 out of 5 stars My Mistake
    Reviewed in Canada on March 2, 2021
    Amazon Customer
    5.0 out of 5 stars Pretty simple guys. Costs dramatically more than the cheap knockoffs
    Reviewed in Canada on December 30, 2020
    Amazon Customer
    5.0 out of 5 stars great product. All pieces were shipped
    Reviewed in Canada on December 5, 2017
    Rod M.
    5.0 out of 5 stars so far so good.
    Reviewed in Canada on December 16, 2016