What are the types of oxygen sensors?

[SanHarmony]

Below are the types of oxygen sensors: 1. Conventional Oxygen Sensor: Automotive oxygen sensors mainly include zirconia dioxide and titanium dioxide types, both of which can be either heated or unheated. Most vehicles use the heated type. 2. Nitrogen Oxide Sensor: The nitrogen oxide sensor is used to identify and check whether the three-way catalytic converter is functioning properly. 3. Air-Fuel Ratio Sensor: The air-fuel ratio sensor can continuously detect the air-fuel ratio across the entire range from rich to lean mixtures. Compared to conventional oxygen sensors, this type of sensor enables feedback control of the air-fuel ratio throughout the entire operating range of the engine, achieving excellent emissions and performance in all operating conditions.

[SanVera]

I remember back when I was repairing cars, the oxygen sensor was a crucial component for ensuring engine combustion efficiency. It mainly comes in two types: upstream and downstream. The upstream sensor is located before the catalytic converter and is responsible for monitoring the oxygen content in the exhaust gases, helping the computer adjust the fuel mixture ratio. The downstream sensor is positioned after the catalytic converter to check its conversion efficiency. Common materials include zirconia and titania types, with zirconia being more prevalent due to its fast response and lower cost, while titania is used in some high-performance vehicles. Heated sensors have built-in heating elements, allowing for quicker responses during cold starts in winter, whereas non-heated ones are slower. Narrowband sensors can only distinguish between rich or lean fuel conditions, but wideband sensors are much more precise and are standard in modern vehicles. I often advise car owners to regularly inspect their sensors, as clogging or aging can lead to increased fuel consumption. When replacing, choosing OEM specifications is more reliable.

[LeAlexandra]

In my work with fleet vehicles, I've dealt with numerous sensor issues, and oxygen sensors are actually quite straightforward in terms of types. The most common classification is by location: upstream and downstream. The upstream sensor is located in the main exhaust pipe, helping to control the air-fuel ratio; the downstream sensor is at the catalytic converter outlet, ensuring emissions compliance. Material-wise, zirconia sensors are based on zirconium oxide, providing direct output signals and easy installation; titanium sensors are more durable but costlier. Heated sensors come with a small heater, reaching operating temperature faster during startup, preventing prolonged warm-up periods. Narrowband types are standard in older vehicles, with crude signals; wideband sensors offer much greater precision, ideal for modern engines requiring accurate fuel control. From a maintenance perspective, upstream sensor failures are more common, affecting engine power – never ignore them, and avoid cheap replacements during checks and repairs.

[DeClara]

I learned from the car enthusiast community that oxygen sensors are divided into several basic types. First, the upstream sensor is located before the catalytic converter, monitoring the oxygen content in the exhaust; the downstream one is after the catalytic converter, responsible for checking the purification effect. In terms of material, zirconia sensors are common in most vehicles, while titanium types are rarer but more durable. Heated sensors have built-in preheaters for quick heating and fast response; non-heated ones start up slower. There’s also a distinction between narrowband and wideband: narrowband only provides high or low oxygen signals, while wideband offers continuous data, making the engine more fuel-efficient. Don’t underestimate these—dirty sensors can affect signals, so when your car struggles to accelerate smoothly, check them first.