9 Best Oxygen Sensors Reviews and Buying Guide 2021

Oxygen sensors are a crucial component in your trucks, SUVs, and cars. An oxygen sensor is also known as an O2 sensor. The work of the oxygen sensor is to detect the level of oxygen in the engine’s exhaust flow. It then reports that level to the ECU, thus helping the engine adjust the fuel to the air mixture.

This keeps the exhaust oxygen levels at adequate levels. At times the oxygen sensors will go bad, and you will be required to replace them with the best oxygen sensors. When the oxygen sensors fail, the ECU gets the wrong information, thus making the engine the wrong fuel to air ratio.

This makes the engine backfiring, cascading, poor performance, and other undesirable complications. The market is over-flooded with many oxygen sensor brands, and it may confuse you to choose the best. Here we shall discuss some of the best oxygen sensors, the top O2 sensors, and a buying guide.

Top 3 O2 Sensors for Quick selections 

Denso12594452 Oxygen...
Denso 234-9005 Air- Fuel...
GM Genuine Parts AFS138...
Denso12594452 Oxygen...
Denso 234-9005 Air- Fuel...
GM Genuine Parts AFS138...
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1,726 Reviews
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417 Reviews
Denso12594452 Oxygen...
Denso12594452 Oxygen...
1,726 Reviews
Denso 234-9005 Air- Fuel...
Denso 234-9005 Air- Fuel...
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GM Genuine Parts AFS138...
GM Genuine Parts AFS138...
417 Reviews

Oxygen Sensors Brands

The number of O2 sensor manufacturers keeps on increasing in the market. This makes it difficult to differentiate genuine manufacturers from fake ones. To save you the confusion on what brand you should consider, let me discuss some of the best brands you should consider.

A good brand should have a wide variety of products to meet diverse customer needs. These reputable brands have served the market, and they have managed to maintain quality in their products. They include:

Bosch

Bosch is one of the most common manufacturers of auto repair parts. It was started in 1886 by Robert Bosch. Their headquarters are located in Stuttgart, Germany. This company is the original inventor of oxygen sensors. It started the production of O2 sensors in 1976. The Volvo 240/260 series was the first passenger vehicle fitted with the Bosch oxygen sensors.

The production then grew quite fast, and the O2 sensor became a vital tool in reducing CO2 emissions and fuel efficiency. Up now, Bosch has produced more than 1 billion sensors since then. Their oxygen sensors lead the market due to their high-quality reputation.

They offer a variety of sensors ranging from universal to vehicle-specific oxygen sensors. You are advised to consider their OEM version unless your engine has a custom setup. OEM sensors are the easiest swaps for replacing old oxygen sensors. All Bosch sensors are made to meet and exceed the OE specification.

Spectra

Spectra Premium Industries Inc. is a well-known brand for auto parts, and it has offered its services since 1989. The company headquarter is located in Boucherville, Canada. Their key markets are aftermarket repair parts in North America and OEM systems for industrial, heavy, and conventional light vehicles.

Spectra also market OEM systems for electric and hybrid vehicles worldwide. This privately-owned company manufactures designs and markets technologies that support sustainable mobility. The company deploys manufacturing and engineering expertise in key processes like metal transformation, electronics, and heat transfer.

Spectra manufacturer is well known for making some of the best O2 sensors for different types of vehicles. They manufacture their sensors to meet their high standards. They ensure that the sensors will offer you quality throughout their service life. The sensors are well packaged, reliable, and durable.

Denso

Denso is a global supplier of auto parts. The company was founded in 1949 and is located in Aichi, Japan. This manufacturer specializes in aftermarket and OEM parts for most vehicle models. The brand is built on delivering value, reliability, and quality. All their products are designed to offer the user an all-around performance.

Denso’s ‘‘first fit’’ philosophy is what attracts attention in the automotive world. They make a variety of fuel and ignition system components, and O2 sensors are one of them. Their oxygen sensors are designed with precision and taken through rigorous performance and safety tests.

ACDELCO

ACDELCO is part of General Motors. General Motors have been in the market for more than 100 years since 1916. They have pushed the innovation, technology, and transportation industry to another level. ACDELCO is the only sure source of General Motors’ original equipment.

Their parts function precisely and fit exactly because they are engineered, designed, backed, and tested by General Motors. One of the most known ACDELCO products is the oxygen sensors. Their sensors are recommended for GM replacements of your auto’s original component.  

O2 sensors act as the feedback of your car’s exhaust system. It helps in measuring the proportion of oxygen in the vehicle’s exhaust gases. ACDELCO OE oxygen sensors are manufactured to fit specific GM vehicles. They offer the same durability, performance, and service life as General Motors.

Their oxygen sensors are also some of the cheapest you will get in the market. Are cheap O2 sensors any good? If you have ever asked yourself this question, ACDELCO units are examples of cheap but high-quality oxygen sensors.

NGK NTK

NGK is a worldwide manufacturer of technical and automotive ceramics products. This company is based in Japan. It, however, has operating centers in the US that produce oxygen sensors and spark plugs. NGK is one of the pioneer manufacturers of oxygen sensors, and it has managed to maintain a customer base with its top quality.

NGK NTK oxygen sensors are precision manufactured to ensure high quality and durability. These sensors cover almost all the vehicles on the road. They are made with dual coated platinum for long service life and a 3-stage element overcoat to protect the sensors against contamination. NTK is developing sensor technologies that continue to function with the new advanced vehicle computer components.

Best O2 Sensors

The Best Oxygen Sensors

The exhaust sensors measure the amount of oxygen in the vehicle’s exhaust. The information it sends to the ECU is what directs the engine on the fuel to air mixture. We would want the oxygen sensors of our vehicles to last a lifetime, but unfortunately, that is not the case.

A faulty oxygen sensor affects the performance of the vehicle’s engine. Some of the most common signs of a malfunctioning O2 sensor are rough engine idle, poor gas mileage, and check engine light.

If you note any of these symptoms, you will need to replace the sensors with good and quality O2 sensors. Here are some of the top-quality oxygen sensors you will get for your vehicle:

1. Denso 234-9005 Oxygen Sensor

Denso 234-9005 is an ultra-power oxygen sensor that effectively monitors your car’s fuel to gas ratio. Its design has a zirconia electrolyte featuring an alumina heat substrate. This feature regulates the amount of oxygen flowing in the diffusion layer, thus limiting the current flow.

This oxygen sensor is made with a heat-resistant design. The sensor, therefore, does not melt on the connectors, and it works perfectly in extreme heat conditions. Denso 234-9005 oxygen sensors provide you with accurate readings and optimize the vehicle engine’s performance.

Its high accuracy will help the engine to burn efficiently and give you an amazing driving experience. This Denso sensor is made with a Porous PTFE filter. This filter allows oxygen from the atmosphere to enter the sensor without allowing engine contaminants or water to get in the casing.

Denso O2 sensors are constructed with heavy-duty parts to promote the unit’s service life. Its aluminum oxide trap layer protects the ceramic from lead and silicone poisoning. The unit is also quite easy to install and can work in almost all motor vehicles. On the downside, the oxygen sensor is a little expensive compared to that of its competitors.

2. GM Genuine Parts AFS138 Oxygen Sensor

General Motor vehicle owners are recommended to buy GM OE parts for replacements. ACDelco GM oxygen sensors are the ideal oxygen sensor replacements for GM vehicles. These sensors are made to detect the oxygen content in the vehicle’s exhaust gases and help in emissions performance.

ACDelco heated oxygen sensor offers you great value for your money. It is one of the most affordable oxygen sensors you will get in the market. With these sensors, you will experience a significant improvement in your vehicle’s fuel economy. These sensors are made with high-grade stainless steel. 

GM Genuine Parts AFS138 oxygen sensors are corrosion and rust-resistant. The sensors come together with high-quality cables and plastic adaptors, which do not melt easily in extreme heat conditions. The process of removal and installation is quite easy. You can also consider their other units, ACDelco afs106 oxygen sensor, and ACDelco afs105 oxygen sensor.

3.   Denso 234-4668 Oxygen Sensor

Just like we have discussed above, Denso manufacturers are among the most reputable manufacturers of oxygen sensors. Their oxygen sensors are made with advanced technologies and systems. Denso12594452 oxygen sensor is made to detect the amount of oxygen in your vehicle’s exhaust stream.

This Denso oxygen sensor is constructed with aluminum oxide, fluorine rubber, porous polytetrafluoroethylene, high-quality steel, and high-grade ceramics and platinum. It features stainless steel housing, porous PTFE, an aluminum oxide trap layer, and a double protection layer.

All Denso oxygen sensors are constructed with precision to meet and exceed all the OE standards. Denso12594452 oxygen sensors are easy and to install and assures you of longevity. The sensors are made for specific vehicles; thus, it is crucial to confirm if it is compatible with your vehicle model.

4. Bosch 13680 Oxygen Sensor

One question people ask is, are Bosch oxygen sensors any good? Bosch Company invented oxygen sensors and has been producing them since 1976. Therefore, when it comes to O2 sensors, they have the most experience compared to all other manufacturers. Their Bosch 13680 oxygen sensor is designed as an OE fitment for Honda and Acura.

Bosch 13680 oxygen sensors are thimble and planar switching O2 sensors. They are designed to meet and exceed the OE specifications. These sensors are made with double laser-welded stainless steel. This protects them against contamination. Their threads are pre-coated using an anti-seize compound for easy installation.

Bosch direct fit OE connectors and harness makes the process of installation easy and quick. The sensors will help your vehicle by lowering emissions and improving fuel efficiency. Since a premium brand makes this O2 sensor, it might be a little more expensive.

5. NGK NTK 24302 Oxygen Sensor

Bosch may be the first oxygen sensor manufacturer, but NTK is the world’s largest manufacturer and supplier. NTK 24302 sensors are specifically designed for OEM applications. These sensors go through extensive testing during the manufacturing process to ensure reliability and quality.

NTK oxygen sensors have a dual-coated platinum element, thus ensuring quick response time and increased longevity. Its water-resistant connector protects the sensor from water contamination and other related failures. NTK 24302 O2 sensors also feature a pure alumina ceramic. This feature protects the sensor element by filtering the exhaust gas effectively.

NGK NTK 24302 oxygen sensors feature various protective sheathings, which helps it resist high temperatures. The sensors’ 3-stage element overcoat protects the sensor from contamination. It also has fat light off times, which reduce the time spent in open-loop mode, thus increasing fuel economy and reducing emissions.

6. YCT Oxygen Sensor

YCT oxygen sensor is the ideal O2 sensor for Ford, Jaguar, Lincoln, Mazda, and Mercury models. These oxygen sensors are designed to be a perfect replacement for the original sensors. The sensors, however, do not fit all vehicles. Therefore check if your current sensor has this part number fitment.

They include 15717, 15716, 15718, 15719, 234-4127, 234-4071, 234-4609, 234-4610, 234-4045, 22500, 234-4070, 22060, 234-4374, 234-4001 and SG1803. One of the great things you will enjoy from the YCT sensors is their high reliability and easy installation. The sensors will improve your engine’s performance and improve the air to fuel ratio of your vehicle.

These YCT oxygen sensors are known to reduce your car’s emissions and minimize the noise that comes when starting your car. YCT O2 sensors are made with high-quality materials. This enables them to withstand the harsh environment they are exposed to in the vehicle’s exhaust pipe.

7. Walker Products 350-35046 Oxygen Sensor

Walker Products 350-35046O2 sensors are developed and engineered to be a replacement for OE manufacturers around the world. Each of the part numbers is made for a specific application and fitment position of the vehicle. The sensors decrease emissions, fuel efficiency and improve engine performance.

Walker Products oxygen sensors are engineered, assembled and performance tested in the USA. This guarantees you of their quality and durability. The O2 sensors are easy to install and resistant to corrosion. The Walker Products 350-35046 oxygen sensors are also stain proof and waterproof.

8. JESBEN 4pcs Oxygen Sensor

JESBEN Company was started in 2003, and they have been supplying the market with different types of fuel injection parts. Their main products are knock sensors, airflow sensors, nox sensors, ignition coils, oil pressure sensors, and oxygen sensors, among others.

This JESBEN oxygen sensor package contains four pieces of O2 sensors. The oxygen sensors help to improve the engine performance and its purification rate. The sensors are made with good accessory materials and superior technology. These make them corrosion-resistant, high temperature resistant and have a long life span.

9. MOTOALL Oxygen Sensor

MOTOALL O2 sensors are some of the best oxygen sensors in the market. These oxygen sensors are compatible with a wide variety of vehicles. They detect the oxygen content in the exhaust gases and help to save fuel and improve the engine performance.

MOTOALL oxygen sensors come with a package of 4 pieces with both downstream and upstream sensors. This unit perfectly fits in Nissan Pathfinder 2005 234-5060 234-4301 and 234-4273. The sensors are made with high-quality materials for reliability and durability.

Best Oxygen Sensors Buying Guide

Having read about the top oxygen sensors in the market, it is now time to learn what to consider when buying an O2 sensor. From the above information, you can see that each sensor has its unique features depending on its manufacturer.

So how do you get to know the right oxygen sensor to buy for your vehicle? Here are the factors to consider:

Compatibility

Just like you can see in our above review, the oxygen sensors are made to fit specific vehicles. Using an unfit O2 sensor in the vehicle can cause more damage to the engine than a worn-out oxygen sensor can do.

The manufacturing companies give you information on the car models and the year their oxygen sensors are compatible. Therefore, you have the correct details of your vehicle before you purchase a new oxygen sensor. Also, confirm the part number your vehicle is using and match it with the new one.

Construction Quality

The quality of construction of an oxygen sensor is an indicator of its service life. The materials used to make this unit will differentiate the good O2 sensors from the bad ones. Consider buying oxygen sensors made with strong materials that can withstand the exhaust system’s high temperatures and harsh environment.

Some of the best oxygen sensors are made with high-quality plastics that do not melt even after exposure to high temperatures. The sensor should also be corrosion resistant and contamination resistant. It should also be easy to clean the unit when using the best oxygen sensor cleaner.  

Accuracy

By now, we know that oxygen sensors measure the amount of oxygen in the exhaust gases. It then sends this information to the vehicle’s computer, which then helps the engine regulate air to fuel mixture. Sending the wrong information will affect the engine’s performance.

Therefore, when buying an oxygen sensor, you need to ensure that it is highly accurate and sensitive. A good sensor sends accurate information, thus improving your driving experience. Accurate data also reduces emissions from your vehicle and provides you with better gas mileage.

Ease of Use

These days most tasks have moved to DIY. We all want products that we can install by ourselves, thus reducing the money we spend on mechanics. Manufacturers have discovered this need, and they have started producing units that are easy to use for both armatures and professionals.

The best oxygen sensors are designed in a way that is quite easy to use. Ensure that you purchase a sensor that is easy to install. Most of this easy to install sensors have a convenient plug-and-use adapter or screw-on design. This feature helps you to fix it quickly and easily in the exhaust manifold.

Brand

One important thing you need to check when buying an oxygen sensor is its brand. All brands have their history and track records. Most of the reputable brands are known for making some of the most high-quality units.

Companies that have been in the market for a long will ensure they offer reliable products since they are afraid of ruining their reputation. Check the customer reviews of people who have used the products before and it will help you settle on the best brand of oxygen sensors.

Wire Length

The length of the wire is quite important when purchasing an oxygen sensor. Some sensors have short wires, while others have longer wires. A shorter wiring harness is suitable for short vehicles.

This is because a short wiring harness is easy to install in a short vehicle and provides a shorter distance signal transmission. However, if you are using larger vehicles like pickups or trucks, you should consider sensors with a longer wiring harness.

Budget

The price of an oxygen sensor is one thing people look at before they buy. The main question that people have at this point is the difference between cheap vs. expensive o2 sensors. Most people think that expensive O2 sensors are more reliable and better. However, we still have some high-quality units which are budge friendly such as ACDelco afs21 oxygen sensors and ACDelco 2131694 oxygen sensors.

Some good oxygen sensors will cost you between $70 and $130. However, the more advanced sensors will cost more. You need to check the quality and if the sensor will serve the purpose without degrading your engine’s performance. Check your budget and purchase the best oxygen sensor within the budgeted price.

Best Oxygen Sensors

Frequently Asked Questions (FAQs)

Q: What Brand of Oxygen Sensor Is Best?

There are different good brands in the market. Some of the oldest brands are some of the best in the market. These brands have learned the act of time, and thus their qualities are guaranteed.

The best brand will depend on your needs and the model of your vehicle. Some brands only make oxygen sensors for specific vehicle models. Some of the best brands for oxygen sensors are Bosch, Denso, NGK NTK, ACDELCO and Spectra.

Q: Are Aftermarket Oxygen Sensors Any Good?

Oxygen sensors are prone to damage due to the harsh environment they work in. the only option to solve this problem is to replace the worn-out oxygen sensor with a new or aftermarket or refurbished sensor. Some of the aftermarket oxygen sensors work as well as OEM sensors.

The easiest way to buy a good aftermarket O2 sensor is to get one from a reputable brand. Ensure that the oxygen sensor is constructed with high-quality materials and meets or exceeds the OE standards. Also, make sure it is a perfect fit for your vehicle model.

Q: Which Oxygen Sensor is Better Bosch or Denso?

On what oxygen sensor is better between Bosch vs. Denso, we shall start by saying that both of them are great brands. Bosch was the first company to develop oxygen sensors. Deciding on the better one between the two will depend on what exactly you are looking for and your vehicle type.

Most of the European-made vehicles work better with Bosch oxygen sensors. Denso oxygen sensors work well with Asian-made vehicles. However, this does not mean that they cannot work on other vehicles. Just make sure that they perfectly fit and are compatible with your vehicle. Denso oxygen sensors are also more expensive compared to the Bosch O2 sensors.

Q: Are All O2 Sensors the Same?

All oxygen sensors have the same function, but their features are different. Different O2 sensors come with various size threads. Some oxygen sensors have longer wires than others. The shorter wiring harness is ideal for shorter vehicles, while the long wiring harness is suitable for large vehicles like trucks.

Their features also differ from brand to brand. The manufacturers make specific sensors for specific vehicles. Therefore, it would be prudent to confirm if the oxygen sensor you are about to buy has the right features for your vehicle.

Q: What Brand of O2 Sensor Does Toyota Use?

Toyota vehicles use their Genuine Toyota OEM oxygen sensors. The Toyota Company makes these O2 sensors for Toyota vehicles. However, these vehicles also use other sensors, such as Bosch and Denso.

Q: Who Makes Mopar O2 Sensors?

Mopar Company manufactures Mopar sensors. This company was born in 1937 as a brand of antifreeze products. It has since grown to be a renowned manufacturer of automotive parts, service, and care providers for FCA US LLC car owners worldwide.

Q: Will a New O2 Sensor Improve Performance?

The vehicle’s oxygen sensors wear out after years of use. Malfunctioned oxygen sensors reduce the engine’s performance. To correct this, you should replace the worn-out sensor with a new one.

And that is where the question of will a new o2 sensor improve performance comes in. A new oxygen sensor increases your vehicle’s performance. However, you have to ensure that the new O2 sensor is compatible with your vehicle.

Using non-compatible oxygen in your vehicle will cause more harm to the engine than a malfunctioning sensor. A new and good sensor increases the engine’s performance and reduces emissions, and improves fuel consumption.  

Q: Should I Replace All My O2 Sensors at Once?

When an oxygen sensor fails, it is recommendable to replace all the sensors, but it is not a must. You can choose to replace only the failed sensor. You can test the O2 sensors when still in the vehicle or remove them and test. Some people prefer to remove all the O2 sensors and test them at once.

This will help you since you will replace all the failing parts at one time. Failing to replace a failing sensor will reduce the fuel efficiency and cause engine misfires. Experts recommend replacing your oxygen sensors after every 75,000 miles or after 10 to 12 years for better mileage performance.

Final Words:

Oxygen sensors are an important component in your vehicle. Nothing is meant to last forever, and thus this unit will fail after some time. It is prudent to replace the sensors immediately you discover that they may be having a problem. Some of the symptoms of malfunctioning oxygen sensors are a rotten egg smell, rough idling and misfires, and bad fuel economy.

The best oxygen sensor will be easy to install, accurate, and have a long service life. Some of the reasons that can make a good oxygen sensor go bad are when it gets coated with combustion products from the engine, such as oil, sulfur, and carbon. This makes the O2 sensor lose its ability to detect and generate accurate signals.

In the article above, we have discussed the best O2 sensor brands, the top units in the market, and a guide. Since the units are made for specific vehicles, ensure that you get the appropriate one for your vehicle. Remember using the wrong fit for an O2 sensor will cause more damage to the engine.

Tito

Hi There, I am R. Hasan Tito, a mechanic, and owner of this website. My friend and I created this website to share our knowledge, expertise, and experience with our fellow mechanics' community and car users. I am a specialist and certified automotive mechanic (Both Heavy Commercial and Private Cars). I have been working as a mechanic for over fifteen years. I worked for a long time at Global Rebound Automotive companies (Toyota, TATA, BMW, Nissan, TVs, and Others ) as a Mechanic and Mechanics Supervisor.

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