Are you trying to find automotive replacement oxygen sensors among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!
We investigated and evaluated a number of the top-selling automotive replacement oxygen sensors on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 15 hours of research and did 31 automotive replacement oxygen sensors tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!
An overview of our top picks
Table of contents
The best automotive replacement oxygen sensors you can buy today
- Efficient Fuel Consumption
- Easy installation
- Constructed from high quality material
- Manufactured with precision to meet OE standards
- [INNOVATIVE TECHNOLOGY] - Every Bosch Oxygen Sensor benefits from the technological and manufacturing experience gained from decades of production since first inventing the Oxygen Sensor in the late 1960's, ensuring long-lasting, superior performance
- [FACTORY TESTED] - Seared appearance of protection tube is a result of a 100% fully functional quality test to ensure every Bosch manufactured sensor meets Bosch's rigorous standards for quality and performance
- [STAINLESS STEEL BODY] - Exclusive double laser-welded stainless steel body is totally submersible and sealed tight to protect against damage from exhaust emissions — ensuring longer sensor service life
- [FAST ACTING HEATER] - Fast-acting heater optimizes sensor operation on Planar and 3, 4, and 5 wire Thimble type sensors allowing the oxygen sensor to reach its operating temperature quicker – within seconds – for optimum performance
- [READY TO INSTALL] - True Direct-fit OE connectors and harnesses, along with threads pre-coated with anti-seize compound right out of the box, make installation simple and hassle-free
- Compatible with select vehicles, including but not limited to the following (Note: verify specific fitment details, including sensor position, with fit checker above): FORD: 92-97 Aerostar, 90-96 Bronco, 92-11 Crown Victoria, 90-14 E-150, 90-14 E-250
- Compatible with (cont.): FORD: 90-05 E-350, 99-16 E-350 Super Duty, 00-16 E-450 Super Duty, 02-03 E-550 Super Duty, 96-99 Econoline Super Duty, 05-10 Escape, 94-03 Escort, 00-05 Excursion, 97-11 Expedition, 95-10 Explorer, 01-03,07-10 Explorer Sport Trac
- Compatible with (cont): FORD: 94-97 F Super Duty, 90-03,09-10 F-150, 90-11 F-250, 94-97,99-11 F-350, 99-08,10-12 F-450, 94-97 F53, 99-04,06-09,12-15 F53, 99-12 F-550, 12-15 F59, 05-07 Five Hundred, 10 Flex, 00-04 Focus, 04-07 Freestar, 05-07 Freestyle
- Compatible with (cont): FORD: 06-10 Fusion, 90-10 Mustang, 89-11 Ranger, 91-07 Taurus, 91-97,02-05 Thunderbird, 95-03 Windstar; LINCOLN: 03-05 Aviator, 91-94,97-02 Continental, 00-06 LS, 93-94,96-98 Mark VIII, 98-11 Navigator, 91-11 Town Car, 06 Zephyr
- Compatible with (cont): MAZDA: 01-10 B2300, 98-01 B2500, 95-08 B3000, 95,97-10 B4000; MERCURY: 91-02 Cougar, 92-11 Grand Marquis, 03-04 Marauder, 05-10 Mariner, 06-10 Milan, 05-07 Montego, 04-07 Monterey, 97-10 Mountaineer, 99-00 Mystique, 91-05 Sable
- [INNOVATIVE TECHNOLOGY] - Every Bosch Oxygen Sensor benefits from the technological and manufacturing experience gained from decades of production since first inventing the Oxygen Sensor in the late 1960's, ensuring long-lasting, superior performance
- [FACTORY TESTED] - Seared appearance of protection tube is a result of a 100 percent fully functional quality test to ensure every Bosch manufactured sensor meets Bosch's rigorous standards for quality and performance. Recommend to use OTC 6500 Flexihead O2 Sensor Wrench
- [STAINLESS STEEL BODY] - Exclusive double laser-welded stainless steel body is totally submersible and sealed tight to protect against contamination from exhaust emissions — ensuring longer sensor service life
- [FAST ACTING HEATER] - Fast-acting heater optimizes sensor operation on Planar and 3, 4, and 5 wire Thimble type sensors allowing the oxygen sensor to reach its operating temperature quicker – within seconds – for optimum performance
- [READY TO INSTALL] - True Direct-fit OE connectors and harnesses, along with threads pre-coated with anti-seize compound right out of the box, make installation simple and hassle-free
- Compatible with select 2000-07 vehicles (verify model years and specific fitment details with AmazonConfirmedFit fit checker above): BUICK: Allure, Century, LaCrosse, LeSabre, Lucerne, Park Avenue, Rainier, Regal, Rendezvous, Terraza; CADILLAC: CTS
- CADILLAC: DeVille, Eldorado, Escalade/ESV/EXT, Seville; CHEVROLET: Astro, Corvette, Equinox, Express 1500, Express 2500, Express 3500, Impala, Malibu, Monte Carlo, Silverado 1500/1500 HD, Silverado 2500/2500 HD, Silverado 3500/3500 HD, SSR,
- CHEVROLET: Suburban 1500/2500, Tahoe, Trailblazer EXT, Uplander, Venture; GMC: Envoy, Envoy XL/XUV, Safari, Savana 1500, Savana 2500, Savana 3500, Sierra 1500/1500 HD,Sierra 2500/2500 HD, Sierra 3500/3500 HD, Yukon, Yukon XL 1500/2500; HUMMER: H2
- ISUZU: Ascender; OLDSMOBILE: Aurora, Intrigue; PONTIAC: Aztek, Bonneville, Grand Prix, G6, Montana, Torrent; SAAB: 9-7x; SATURN: Aura, Relay
- REPLACEMENT OXYGEN SENSOR -The oxygen sensor, also known as air fuel ratio sensor, is an essential sensor for your car’s performance. The sensor is located in the exhaust system and helps with emissions control by allowing the fuel injection and engine timing to operate effectively.
- FITMENT - Compatible with 2005-2007 Chrysler 300, 2006-2007 Dodge Charger, 2004-2007 Dodge Dakota, 2004-2007 Dodge Durango, 2005-2007 Dodge Magnum, 2004-2007 Dodge Ram 1500 2500 3500, 2006 Jeep Commander, 2004 2005 2006 2007 2011 Jeep Grand Cherokee, 2004 - 2006 Jeep Liberty, 2004 2005 2006 2010 2011 Jeep Wangler, 2006 Mitsubishi Raider
- REPLACE OE NUMBER - For Mopar: 56028994AA, 56028994AB, 5149170AA, replace 56044627AA, 56044652AA, 05149170AA; for Spectra OS5249; other 23135, 18125, 56041698AA
- FUNTION & PREMIUM QUALITY - The sensor ensures that your car is driven with the optimal air-fuel ratio at all times, which helps extend the life of the catalytic converter. The oxygen sensor directly replaces the old parts and is easy to install.
- WHAT YOU'LL GET - 2pcs upstream oxygen sensor & 2pcs downstream oxygen sensor & 24 months' warranty. While these are not genuine OEM oxygen sensors, it is a direct replacement for the factory O2 sensors.
- GUIDE - Please clean the physical damage in the area before replacing the oxygen sensor.
- 【REPLACE#】15716, 15717, 15718, 15719, ZZC318861, XR3Z9G444CA, 15664, 234-4401, 234-4046. IF THE PLUG OF THE O2 SENSOR IS DIFFERENT FROM THE ORIGNAL PART, THIS PART WILL NOT FIT YOUR VEHICLE. PLEASE COMPARE THE ORIGINAL PART WITH PICTURES TO ENSURE YOU ARE ORDERING THE CORRECT PART
- 【PREMIUM QUALITY】Durability matters, that is why our o2 sensor is crafted from high temperature resistant material for quicker response times. Double laser-welded stainless steel body is totally submersible to seal tight for long life
- 【HIGH PERFORMANCE】A defective or sluggish oxygen sensor can cause a variety of issues, like decreased engine performance. This oxygen sensor will accurately detect the mixture of air and fuel, helps ensure your engine is constantly monitored and operating efficiently, while maximizing performance
- 【REPLACEMENT FOR】2003-2014 Ford E150 E250 | 1999-2016 Ford E350 Super Duty | 2001-2010 Ford Escape | 1997-2011 Ford Expedition | 1995-2010 Explorer | 1990-2010 F150 | 1999-2011 F250 F350 Super Duty | 1990-1996 Bronco | 92-11 Crown Victoria | 00-04 Focus | 91-07 Taurus | 98-11 Lincoln Navigator | 01-10 Mazda Tribute | 05-10 Mercury Mariner & more
- 【12-MONTH WARRANTY】If for any reason at all, you are not fully satisfied with the upstream downstream oxygen sensor, simply contact us through Amazon message to apply the service of carefree REPLACEMENT or REFUND
- Cautions: Please check your vehicle fitment carefully in the product description to avoid any wrong purchase.Please check your part pictures with our pictures, especially the plug, it must be completely same. Or it will not fit your car
- Application: Marsflex Oxygen O2 Sensor 234-4622 Compatible for Toyota Camry Hybrid 2007-2017,Camry LE 1994-1999 2004-2006 Camry LE 2.5L 2010-2017,Camry SE 1994-1996 2004-2006 Camry SE 2.5L 2010-2017,Camry XLE 1994-2000 Camry XLE 2.5L 2004-2017,Avalon Sienna 4Runner RAV4 Solara Matrix Lexus ES300 Pontiac Vibe
- Advantage: Made of high-quality materials, strong durability, to ensure service life, Marsflex O2 Sensor can improve engine performance and fuel economy, extend Catalytic Converter life
- Easy Installation:Marsflex oxygen sensor 234-4622 total length 16.5 inch. Manufactured to OE specification fit form and function, durable and easy installation
- Warranty: 1-YEAR WARRANTY. ALL Marsflex oxygen sensors are extensively tested during manufacturing to guarantee quality, reliability,and above all,always meet or exceed the original equipment specifications
- Detect oxygen content in the exhaust gases to optimize emissions and fuel economy
- GM-recommended replacement part for your GM vehicle’s original factory component
- Offering the quality, reliability, and durability of GM OE
- Manufactured to GM OE specification for fit, form, and function
- Efficient Fuel Consumption
- Easy installation
- Constructed from high quality material
- Manufactured with precision to meet OE standards
- Designed to detect the amount of oxygen in the exhaust system
- Constructed from high quality material.Connector Gender: Male
- Features double protection layer, aluminum oxide trap layer, PTFE filter and stainless steel housing
- Manufactured with precision to meet OE standards
- Easy installation
- [INNOVATIVE TECHNOLOGY] - Every Bosch Oxygen Sensor benefits from the technological and manufacturing experience gained from decades of production since first inventing the Oxygen Sensor in the late 1960's, ensuring long-lasting, superior performance
- [FACTORY TESTED] - Seared appearance of protection tube is a result of a 100 % fully functional quality test to ensure every Bosch manufactured sensor meets Bosch's rigorous standards for quality and performance
- [STAINLESS STEEL BODY] - Exclusive double laser-welded stainless steel body is totally submersible and sealed tight to protect against damage from exhaust emissions — ensuring longer sensor service life
- [FAST ACTING HEATER] - Fast-acting heater optimizes sensor operation on Planar and 3, 4, and 5 wire Thimble type sensors allowing the oxygen sensor to reach its operating temperature quicker – within seconds – for optimum performance
- [READY TO INSTALL] - True Direct-fit OE connectors and harnesses, along with threads pre-coated with anti-seize compound right out of the box, make installation simple and hassle-free
- Compatible with select vehicles (Note: verify specific fitment details, including sensor position, with fit checker above)
- [INNOVATIVE TECHNOLOGY] - Every Bosch Oxygen Sensor benefits from the technological and manufacturing experience gained from decades of production since first inventing the Oxygen Sensor in the late 1960's, ensuring long-lasting, superior performance
- [FACTORY TESTED] - Seared appearance of protection tube is a result of a 100% fully functional quality test to ensure every Bosch manufactured sensor meets Bosch's rigorous standards for quality and performance
- [STAINLESS STEEL BODY] - Exclusive double laser-welded stainless steel body is totally submersible and sealed tight to protect against damage from exhaust emissions — ensuring longer sensor service life
- [FAST ACTING HEATER] - Fast-acting heater optimizes sensor operation on Planar and 3, 4, and 5 wire Thimble type sensors allowing the oxygen sensor to reach its operating temperature quicker – within seconds – for optimum performance
- [READY TO INSTALL] - True Direct-fit OE connectors and harnesses, along with threads pre-coated with anti-seize compound right out of the box, make installation simple and hassle-free
- Compatible with select vehicles (Note: verify specific fitment details, including sensor position, with fit checker above)
- FITMENT: Compatible with 2006-2008 Honda Ridgeline RT - 3.5L, 2005-2008 Acura RL 3.5L,for 2003-2006 Acura MDX 3.5L, for 2003-2007 Honda Accord EX LX- 3.0L Auto Trans, for 2005-2006 Honda Odyssey EX EX-L LX- 3.5L
- Part Number: 234-5010 36531-RCA-A01 36531-RCA-A02 36531-RDJ-A01 36531-RDM-A01 36531-RDV-004 24302 234-4355 36532-PZA-L01 36532-RCA-A51 36532-RCJ-A01 36532-RJA-004 36532-RGL-A11
- EASY INSTALLATION: AUTO OCCASION car parts are made with strict quality control and high compatibility. Every car part undergoes rigorous testing before leaving the factory, and every plug matches the OE standard. This means that you can easily and quickly connect the car part to your vehicle and get an instant response. No more hassle or delay in installing your car part
- Customer Service: We welcome all questions through our Q&A section and will respond promptly. Even if your question is not related to the product, we are happy to help.
- Delivery: We will strictly check the quality of the goods before delivery
- OE Reference Part Number: Our automotive replacement oxygen o2 sensor upstream downstream can replaces 213-4229: 234-4407,234-4651,234-4256,12609457, 12569429,12573005,12573167,12611165, 92457789,25024736; 234-4668: 12569429, 12576131, 12583290, 12583804, 12584925, 12587785, 12590790, 12594452, 12596558, 12597878, 12607410, 12609001, 12611127, 8125731670. (Please check your vehicle information before purchasing.)
- Compatible with Vehicle Fitment: STZJAYE sensor de oxgeno up and down stream oxygen 02 sensors oem 213-4229 234-4668 compatible with-Cadillac for Escalade 2008-2014, for Chevrolet-Avalanche 2008-2013, for Silverado 1500 2008-2013, for Silverado 2500 HD 2008-2010, for Silverado 3500 HD 2008-2010, for Tahoe 2008-2014, for Suburban 1500 2008-2014, for GMC-Sierra 1500 2008-2013, for Sierra 2500 HD 2008-2010, for Sierra 3500 HD 2008-2010, for Yukon 2008-2014, for Yukon XL 1500 2008-2014,etc.
- How to Confirm the Vehicle Fitment: You can select the "Year/Make/Model" or other parameters of your car at the top of the description list and click "Confirm" before purchasing. Check if this oxygen 02 sensor is suitable for your vehicle completely. Bank 1 Sensor 1=Upstream(Right/Rear); Bank 2 Sensor 1=Upstream(Left/Front); Bank 1 Sensor 2=Downstream(Right/Rear); Bank 2 Sensor 2=Downstream(Left/Front).
- Easy Installation Oxygen Sensor: Manufactured to OE standard specification fit form and function. Our o2 sensor can directly replaces the old parts. How to Replace the Oxygen Sensor? STEP1. Diagnostic trouble codes to identify the faulty sensor; STEP2. Disconnect the oxygen sensor; STEP3. Remove the oxygen sensor; STEP4. Compare the faulty oxygen sensor with the replacement sensor; STEP5. Install the new sensor and connect the harness; Clear the codes then start the vehicle.
- One Year Unlimited Mileage Quality Guarantee
- Fit 2012-2017 Buick Enclave 3.6L; Fit 2013-2018 Cadillac XTS 3.6L; Fit 2012-2016 Chevrolet Caprice 3.6L; Fit 2015-2016 Chevrolet Colorado 3.6L; Fit 2014-2018 Chevrolet Impala 3.6L; Fit 2012-2017 Chevrolet Traverse 3.6L; Fit 2012-2016 GMC Acadia 3.6L; Fit 2015-2016 GMC Canyon 3.6L;
- 4pcs; Upstream and Downstream
- Before buying, check the “Select Your Vehicle” check (Make, model, year, engine, Note,The engine and Note in particular) at the top of the link to see if your car can be used.
- 100% OE Replacement
- Dual lower shield design, ceramic element
- Laser welded body and shield
- Plasma sprayed protective coating, and High Temperature Sleeving
- Industry proven performance - approved by professional technicians nationwide
- Efficient Fuel Consumption
- Easy installation
- Constructed from high quality material
- Manufactured with precision to meet OE standards
- Fit type: Vehicle Specific
- [INNOVATIVE TECHNOLOGY] - Every Bosch Oxygen Sensor benefits from the technological and manufacturing experience gained from decades of production since first inventing the Oxygen Sensor in the late 1960's, ensuring long-lasting, superior performance
- [FACTORY TESTED] - Seared appearance of protection tube is a result of a 100 % fully functional quality test to ensure every Bosch manufactured sensor meets Bosch's rigorous standards for quality and performance
- [STAINLESS STEEL BODY] - Exclusive double laser-welded stainless steel body is totally submersible and sealed tight to protect against damage from exhaust emissions — ensuring longer sensor service life
- [FAST ACTING HEATER] - Fast-acting heater optimizes sensor operation on Planar and 3, 4, and 5 wire Thimble type sensors allowing the oxygen sensor to reach its operating temperature quicker – within seconds – for optimum performance
- [READY TO INSTALL] - True Direct-fit OE connectors and harnesses, along with threads pre-coated with anti-seize compound right out of the box, make installation simple and hassle-free
- Compatible with select vehicles (Note: verify specific fitment details, including sensor position, with fit checker above)
- Efficient Fuel Consumption
- Package Dimensions: 4.826 L x 5.08 H x 15.24 W (centimeters)
- Model: 2344256
- Increases engine performance and throttle response
- Compatible with Jeep Cherokee 3.2 2014-2022, Grand Cherokee Non-5.7 2012-2022, Grand Cherokee WK 2022, Wrangler 2012-2017, Wrangler JK 2018
- Compatible with Chrysler 200 2011-2017, 300 2012-2023, Pacifica 2017-2025, Town & Country 2011-2016, Voyager 2020-2025
- Compatible with Ram 1500 5.7 2013-2018, Ram 1500 Classic 3.6 5.7 2019-2024, Ram 2500 5.7 6.4 2012-2024, Ram 3500 5.7 6.4 2012-2024, Ram 4500 2014-2020, Ram 5500 2014-2020, C/V 2012-2015
- Compatible with Dodge Avenger 2011-2014, Challenger Non-6.2 2012-2023, Charger Non-6.2 2012-2023, Durango Non-5.7 2012-2025, Grand Caravan 2011-2020, Journey 2011-2019
- YHTAUTO Affordable and Prime Oxygen Sensor, Directly Fit
- Replacement for BMW 323CI 2000 2.5L M52/ / 323I 1999-2000 2.5L M52 Sedan Only/ / 325CI 2.5L 2001(M52) 2002-2003/03 (M54)/ / 325I 2001-2003/03 2.5L M54/ / 325XI 2001-2005 2.5L M54/ / 328CI 2000 2.8L M52/ / 328I 1999-2000 2.8L M52 Sedan Only
- Replacement for BMW 330CI/330I 2001-2003/03 3.0L M54/ / 330XI 2001-2005 3.0L M54/ / 525I 2001-2003/03 2.5L M54/ / 528I 1999-2000 M52TU 2.8L/ / 530I 2001-2003/03 3.0L M54
- Replacement for BMW X3 2004-2005(2.5L M54) 2004-2006(3.0L M54 Standard Transmission)/ / X5 2001-2006 3.0L M54/ / Z3 1999-2000(2.8L M52) 2001-2002(3.0L M54)/ / Z4 2003-2005 2.5L/3.0L M54
- Please Confirm the Year, Make, Model and Engine of Your Car Before Purchasing, Especially Special Notes
How to choose a good automotive replacement oxygen sensors
Does the idea of finding a fantastic automotive replacement oxygen sensors make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!
Your presence here indicates that you are interested in automotive replacement oxygen sensors. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top automotive replacement oxygen sensors products available right now. You might be wondering how we came up with the list. How was this buying guide developed?
First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top automotive replacement oxygen sensors on the market right now!
The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:
Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top automotive replacement oxygen sensors brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.
Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top automotive replacement oxygen sensors based on those.
Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.
Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.
Customer ratings: Would it be accurate to suggest that the automotive replacement oxygen sensors were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.
Customer Reviews: Like ratings, provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.
Seller Rank: This is very intriguing! Not only do you need a good automotive replacement oxygen sensors, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.
Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your automotive replacement oxygen sensors.
Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting automotive replacement oxygen sensors for months and years to come.
Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.
Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.
These are the standards by which we selected our automotive replacement oxygen sensors. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.
Why should you believe us?
There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what automotive replacement oxygen sensors should you purchase in 2022?
This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on automotive replacement oxygen sensors.
